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REVIEW 3 major objections 5 minor 34 references

High pressure structural and lattice dynamics study of {\alpha}-In$_2$Se$_3$

T0 review · 3 major / 5 minor · reviewed 2026-08-08 · deepseek-v4-flash

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Pith's one-line read This paper reports that, under truly hydrostatic conditions, In2Se3 follows a simpler high-pressure sequence than previously claimed: the α phase converts to the β′ phase at about 1 GPa, and that β′ phase remains stable up to 45 GPa, with…

desk verdict A careful hydrostatic re-study of In2Se3 that challenges the reported β′→β transition; the no-transition claim is an absence-of-evidence argument that needs a quantitative model comparison before it can be called secure. read the letter →

arxiv 2502.05927 v1 pith:JTVFWE6B submitted 2025-02-09 cond-mat.mtrl-sci

Shiyu Feng , Baihong Sun , Wenting Lu , Haikai Zou , Chenxin Wei , Qian Zhang , Bihan Wang , Martin Kunz
show 4 more authors
Hirokazu Kadobayashi Azkar Saeed Ahmad Elad Koren Elissaios Stavrou
This is my paper · ORCID
classification cond-mat.mtrl-sci
keywords In2Se3highpressurediamondanvilcellRamanspectroscopyX-raydiffractionphasetransitionequationofstateferroelectric
verification ladder T0 review T1 audit T2 compute T3 formal

The pith

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The reading

This paper reports a combined X-ray diffraction and Raman spectroscopy study of layered ferroelectric α-In2Se3 compressed in helium up to 60+ GPa. It claims the ambient α phase transforms to the monoclinic β′ phase at about 1 GPa, and that this β′ phase—not the previously reported β phase—remains stable all the way to 45 GPa. Above 45 GPa, the material enters a disordered, solid-solution-like orthorhombic phase (phase IV), not the cubic defect Th3P4-type structure assigned in earlier work. The conclusion matters because it implies that earlier reports of a β′→β transition at 5–12 GPa were artifacts of non-hydrostatic pressure media, and that the high-pressure behavior of a candidate 2D ferroelectric is simpler than previously thought.

What carries the argument

The central analysis tool is the F–f finite-strain formalism: normalized pressure $F = P/[3f(1+2f)^{5/2}]$ plotted against Eulerian strain $f = [(V_0/V)^{2/3}-1]/2$, where a linear F–f relation indicates a single, stable equation of state without subtle structural modifications. It is used to argue that β′-In2Se3 undergoes no strain-induced change up to 45 GPa. Alongside it, helium as the pressure-transmitting medium maintains near-hydrostatic conditions beyond 50 GPa, and the group-subgroup relation between β′ (C2/m) and β (R-3m) frames why the supposed transition would be second-order and hard to detect.

What would settle it

Collect high-resolution XRD between 12 and 45 GPa under helium and search for weak Bragg peaks allowed in the monoclinic C2/m β′ cell but absent in the rhombohedral R-3m β cell; their disappearance would falsify the paper's central claim, while their persistence would confirm it.

Watch

Extended reading notes

Core claim

The paper establishes, on its own terms, a hydrostatic phase sequence for In2Se3: α (R3m) → β′ (C2/m) at about 1 GPa, with no distinct β (R-3m) phase, followed above 45 GPa by phase IV, a disordered orthorhombic solid solution. The evidence is that the number and frequencies of Raman modes are continuous across 12–40 GPa, that the XRD patterns above 12 GPa can be indexed equally well with β′ or β, and that an F–f equation-of-state analysis shows no deviation from linearity up to 45 GPa. The authors argue that the β′→β transition, being a second-order symmetrization with a group-subgroup relation and no volume change, would be difficult to see in XRD alone, and that previous claims of β rest on non-hydrostatic media and limited low-frequency Raman access. They also reject the cubic defect Th3P4 assignment for phase IV because more Bragg peaks are resolved here, including one low-angle peak the cubic cell cannot index, and the cubic cell gives a physically implausible volume.

Load-bearing premise

The argument breaks if the β′→β transition would be invisible in the measured Raman spectra and F–f plot; the authors assume that a subtle second-order symmetrization with no volume change would still produce a detectable change in the number of Raman modes or in the pressure-volume relation.

Editorial extensions

If this is right

  • The hydrostatic compression sequence of In2Se3 is α → β′ at about 1 GPa, with no further transition until about 45 GPa, so the ferroelectric β′ phase exists over a much wider pressure range than previously thought.
  • The previously reported β′→β transition at 5–12 GPa is likely an artifact of non-hydrostatic pressure media or limited spectral range, not an intrinsic structural transition.
  • Phase IV, stable by at least 67 GPa, is a disordered solid-solution-like orthorhombic structure with about 3 atoms per primitive cell, not the cubic defect Th3P4-type structure.
  • All pressure-induced transformations are reversible at room temperature on decompression, with considerable hysteresis in the reverse IV→β′ transition.
  • A broad amorphous-like XRD feature above 45 GPa suggests partial amorphization accompanying formation of the disordered IV phase, while Raman continuity rules out decomposition.

Reading between the lines

Editorial extensions of the paper, not claims the author makes directly.

  • If the β′ phase is truly stable to 45 GPa, then ferroelectric properties of α-In2Se3 may persist under pressures relevant to strained devices, and earlier reports of pressure-driven loss of ferroelectricity may need re-examination.
  • The proposed orthorhombic oP3-type phase IV, if confirmed by calculations, would be a new high-pressure topology for III–VI compounds; the Bi2Te3 analogy suggests other layered chalcogenides may form similar disordered solid solutions under hydrostatic compression.
  • A direct testable extension is to perform ab initio structure prediction for In2Se3 between 45 and 70 GPa to see whether a low-volume orthorhombic solid solution is energetically favored over the defect Th3P4-type cubic cell.
  • The authors' F–f analysis could be applied to other layered ferroelectrics to distinguish genuine second-order transitions from artifacts of non-hydrostatic stress.
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Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, and a circularity audit.

Referee Report

3 major / 5 minor

Summary. The manuscript reports a combined synchrotron X-ray diffraction and Raman spectroscopy study of α-In2Se3 in a diamond anvil cell with helium as the pressure-transmitting medium, from ambient pressure to above 60 GPa at room temperature. The authors observe the α→β′ transition at about 1 GPa, consistent with previous work, and find no evidence for the previously reported β′→β transition up to 45 GPa. Above 45 GPa they observe a transition to a phase they call phase IV, which they propose is a disordered, solid-solution-like orthorhombic structure. The paper compares its results with earlier studies, attributes earlier reports of β to non-hydrostatic conditions or insufficient resolution, and discusses the reversibility and hysteresis of the transitions.

Significance. If the no-β claim is correct, the paper revises the accepted pressure-temperature sequence of a technologically important layered ferroelectric and provides improved benchmark data under quasi-hydrostatic conditions. The simultaneous XRD and Raman measurements with helium as the pressure medium, the high maximum pressure, and the detailed comparison with previous work are notable strengths. The F−f analysis and the careful discussion of hydrostaticity add value. However, the central negative claim (stability of β′ and absence of β up to 45 GPa) rests on an absence-of-evidence argument whose load-bearing assumption—that a subtle second-order group-subgroup transition would be visible in the measured Raman mode count or in F−f linearity—is not quantified in the manuscript. The phase IV structural assignment is also explicitly preliminary. The significance of the paper therefore depends on closing this gap with a quantitative model comparison.

major comments (3)
  1. [Sec. III B and Fig. 6] The conclusion that β′-In2Se3 remains stable up to 45 GPa is not established by the analyses presented. The manuscript states that XRD patterns above 12 GPa can be indexed with either β′ (C2/m) or β (R-3m), that the transition is characterized by a symmetrization without volume discontinuity, and that the two space groups hold a group-subgroup relation. For a second-order transition of this kind, the finite-strain F−f plot in Fig. 6 probes only volume as a function of pressure and cannot be expected to show a signature; a continuous symmetry change can leave P(V) perfectly smooth. To support the central claim, the authors should provide a quantitative comparison of the two structural models across the 12–45 GPa range, for example Le Bail/Rietveld refinements with both space groups and a report of Rwp, GooF, or an information criterion, together with an estimate of the minimum detectable difference in peak positions/intensities. Without such an analysis, the data are consistent with β′ but they do not rule out β.
  2. [Sec. III A and Figs. 1-2] The Raman evidence against the β′→β transition is also incomplete. The expected signature is a reduction from six Raman-active modes (4Ag+2Bg) to four (2A1g+2Eg), but in unpolarized powder spectra the two modes that should disappear could simply be weak or unresolved. The manuscript reports continuity of mode number and frequencies, but it does not provide a quantitative mode-fitting analysis (line positions, linewidths, integrated intensities, and their pressure dependence across 12–45 GPa) or an explicit detection-threshold estimate. Please add such an analysis and state whether the disappearance of two modes at the level of the experimental noise can actually be excluded.
  3. [Sec. IV and Table I] The phase IV assignment as a disordered solid-solution-like orthorhombic structure is presented in the Abstract and Conclusion as a definite result, but it is inferred from powder-pattern indexing and volume-per-atom arguments rather than from a refined structural model. The proposed occupancies of 0.4 and 0.6 for In and Se are derived from stoichiometry and cell volume, not from diffraction intensities, and the paper concedes that no previously reported oP3-type topology fits the cell. This is a plausible hypothesis, but to be load-bearing it requires either a full Rietveld/occupancy refinement with the proposed model or a clear statement that the orthorhombic solid solution is only one of several possible interpretations. At minimum the word 'conclude' in Section V should be softened to match the explicitly preliminary nature of this assignment.
minor comments (5)
  1. [Abstract and Conclusion] The wording 'remains stable up to 45 GPa' is stronger than the evidence described in Sec. III B, where the authors state that the data show no clear indication of the transition and that the patterns can be indexed with either phase. The abstract, body, and conclusion should adopt a consistent level of certainty, preferably the more cautious formulation.
  2. [Table I] In the last row of Table I, the column entry '3/5' is unclear: it appears to be a garbled combination of the space group and Z value for phase IV. The space group should be written explicitly and Z separated from it.
  3. [Sec. IV] The text compares the proposed phase IV with 'Bi2Ti3 under pressure'; given the following sentence about Bi2Te3 forming a bcc solid solution, this appears to be a typo for Bi2Te3. Please correct the compound name.
  4. [Fig. S5] The caption states that Le Bail refinements are shown for the β-In2Se3 phase, but the paper argues that the phase up to 45 GPa is β′. Please clarify which structural model is used in each panel, or label the phases consistently with the main text.
  5. [General] There are several typographical and wording errors that should be fixed in a careful copyedit, including 'in agrement' in Sec. III B, 'specimens were grained' in Sec. II, and 'A detailed comparison' in Sec. I. None of these affect the science, but they detract from the presentation.

Circularity Check

0 steps flagged · score 1.0 of 10

No circular derivation: the no-β′→β conclusion rests on Raman/XRD observations, not on fitted parameters; the F–f analysis is a standard representation of the same P–V data and is a limitation, not a circular reduction.

full rationale

The paper is an experimental structural study whose claims are not generated by fitting parameters and then relabeling them as predictions. The bulk modulus and its pressure derivative in Table I are standard descriptive fits to the measured P–V data; the F–f plot in Fig. 6 is a rearrangement of the same P–V data used for the Birch-Murnaghan fit, so its linearity is algebraically equivalent to the fitted equation of state rather than an independent test. This is a weakness in the absence-of-evidence argument for β′ stability, but it is not circular because the central claim is also supported by continuity of Raman mode count and frequencies and by the observed absence of Bragg peak appearance or disappearance. The paper itself concedes the putative β′→β transition is second-order, with no volume discontinuity, and that XRD patterns above 12 GPa can be indexed with either phase, so the F–f test cannot be diagnostic for that transition; this is a stated limitation rather than a self-referential derivation. The phase-IV assignment is an indexing and stoichiometry-consistency inference, explicitly described as preliminary and requiring further theoretical work. Self-citations (Refs. 7, 15, 31) are methodological or general contextual statements and are not load-bearing. No circular step is exhibited that reduces a predicted result to an input by construction.

Assumptions & free parameters 4 free parameters · 5 assumptions · 1 invented entities

The central claims rest on standard experimental practice (quasi-hydrostatic helium, ruby and gold pressure calibration, Le Bail refinements) plus two domain assumptions: that a subtle second-order β′→β transition would be resolved, and that the key high-pressure XRD peak is intrinsic. The phase IV structure is a postulated orthorhombic cell with no refined atomic model. No theory-derived constants are used; the only fitted parameters are descriptive EOS constants.

free parameters (4)
  • Bulk modulus B of β′-In2Se3 = 49.2(3) GPa
    Fitted to P-V data at 4.5 GPa with a 3rd-order Birch-Murnaghan EOS; a standard descriptive material parameter, not a hidden knob for the phase-boundary claim.
  • Pressure derivative B′ of β′-In2Se3 = 5.3(12)
    Same EOS fit; not load-bearing for the conclusions.
  • Bulk modulus B of phase IV = 221(5) GPa
    EOS fit at 62.8 GPa; descriptive only.
  • Pressure derivative B′ of phase IV = 8.2(15)
    EOS fit; descriptive only.
assumptions (5)
  • domain assumption Helium remains quasi-hydrostatic up to at least 50 GPa at room temperature.
    Used in Sec. II A and Sec. III to attribute differences from earlier studies to non-hydrostatic PTMs; supported by cited prior work (Klotz et al., Vos et al.).
  • domain assumption The observable Raman mode count distinguishes β′ (4Ag+2Bg) from β (2A1g+2Eg) at all pressures up to 40 GPa.
    Stated in Sec. III A; assumes all zone-center modes remain observable and do not overlap or become accidentally degenerate, the key evidence for no β′→β transition.
  • standard math The C2/m to R-3m group-subgroup relation makes the β′→β transition second-order with no volume discontinuity.
    Used in Sec. III B to explain why the absence of a volume jump does not by itself exclude a transition.
  • domain assumption The low-intensity XRD peak at 4.3 deg above 45 GPa belongs to In2Se3 and not to an artifact from the cell, pressure medium, or reaction products.
    Invoked in Sec. IV as the peak that rules out the cubic model and supports the orthorhombic indexing; if spurious, the orthorhombic assignment loses its unique support.
  • domain assumption The sample stoichiometry remains In2Se3 without decomposition or reaction with helium or the diamond windows.
    Assumed in the atomic-volume argument for phase IV; the authors argue Raman continuity rules out decomposition (Sec. IV).
invented entities (1)
  • Orthorhombic phase IV structure (oP3-like, new topology)
    purpose: Provides an indexing basis for 15+ observed Bragg peaks of the >45 GPa phase and explains the 4.3 deg peak unassignable with the cubic defect model.
    No atomic coordinates, occupancies (beyond the 0.4/0.6 stoichiometry argument), or Rietveld refinement are given; the authors state the exact structure requires further ab initio work, so no independent falsifiable test exists yet.

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Pith. "Pith review of High pressure structural and lattice dynamics study of {\alpha}-In$_2$Se$_3$." pith.science (2026). https://pith.science/paper/JTVFWE6B

@misc{pith2026250205927,
  author       = {Pith},
  title        = {Pith review of: High pressure structural and lattice dynamics study of \alpha-In$_2$Se$_3$},
  year         = {2026},
  howpublished = {\url{https://pith.science/paper/JTVFWE6B}},
  note         = {Machine review of arXiv:2502.05927}
}
abstract

Layered $\alpha$-In$_2$Se$_3$has been studied using a concomitant in-situ synchrotron angle dispersive powder x-ray diffraction and Raman spectroscopy study in a diamond anvil cell up to 60+ GPa, at room temperature. Helium, that remains fairly hydrostatic up to the highest pressure in this study, was used as the pressure-transmitting medium. The results from both experimental methods reveal a pressure-induced structural phase transition from $\alpha$-In$_2$Se$_3$ to a monoclinic $\beta$'-In2Se3 structure at $\approx$1 GPa, in agreement with previous studies. Based on our detailed measurements using both experimental techniques and F-f formalism, the $\beta$'-In$_2$Se$_3$ structure remains stable up to 45 GPa, without a clear indication of a phase transition towards the previously reported $\beta$-In2Se3 phase. Above this pressure, In$_2$Se$_3$ adopts a disordered solid-solution-like orthorhombic structure, phase IV. The results are discussed in comparison with the relevant previous studies of $\alpha$-In$_2$Se$_3$ under pressure.

Figures

Figures reproduced from arXiv: 2502.05927 by the authors.

Figure 1
Figure 1. FIG. 1. Selected high pressure Raman scatter [PITH_FULL_IMAGE:figures/full_fig_p006_1.png] view at source ↗
Figure 2
Figure 2. FIG. 2. Pressure dependence of the Raman [PITH_FULL_IMAGE:figures/full_fig_p007_2.png] view at source ↗
Figure 3
Figure 3. A clear pressure-induced phase transition was observed at ≈ 1 GPa, in agree￾ment with the Raman results of this study and previous XRD studies11,12 and the rel￾evant patterns above 1 GPa can be indexed with the previously reported β’-In2Se3 phase. From the relevant Le Bail refinements of the XRD patterns of this study (see Fig. S5), the lattice parameters and the cell volume for the In2Se3 phases were determined and… view at source ↗
Figures from the paper (4 more)
Figure 3
Figure 3. Figure 3: FIG. 3. Selected XRD patterns of In [PITH_FULL_IMAGE:figures/full_fig_p008_3.png]
Figure 5
Figure 5. Figure 5: FIG. 5. Pressure dependence of the average [PITH_FULL_IMAGE:figures/full_fig_p010_5.png]
Figure 4
Figure 4. Figure 4: FIG. 4. Pressure dependence of the lattice pa [PITH_FULL_IMAGE:figures/full_fig_p010_4.png]
Figure 6
Figure 6. Figure 6: FIG. 6. F- f EOS plot of the P-V data. The [PITH_FULL_IMAGE:figures/full_fig_p011_6.png]

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Reviewed August 8, 2026 · model on record in the stance chip above.