{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2019:XPS7XOSQHA65VCUGE7NCG6PZ5O","short_pith_number":"pith:XPS7XOSQ","schema_version":"1.0","canonical_sha256":"bbe5fbba50383dda8a8627da2379f9ebadd383cd9763559b105e6110e8d4a285","source":{"kind":"arxiv","id":"1905.05497","version":2},"attestation_state":"computed","paper":{"title":"Revealing the complex nature of bonding in binary high-pressure compound FeO$_2$","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"physics.geo-ph","authors_text":"A.D. Rosa, A. V. Ponomareva, C. McCammon, E. Bykova, E. Koemets, G. Aprilis, H.-P. Liermann, I. A. Abrikosov, I. Leonov, J. Haines, J. Rouquette, K. Glazyrin, L. Dubrovinsky, M. Bykov, M. Hanfland, N. Dubrovinskaia, R. Torchio, S. Chariton, S. Cl\\'ement, T. Fedotenko, T. Irifune, V. B. Prakapenka, V. Cerantola, V. Svitlyk","submitted_at":"2019-05-14T10:12:08Z","abstract_excerpt":"Extreme pressures and temperatures are known to drastically affect the chemistry of iron oxides resulting in numerous compounds forming homologous series $n$FeO$\\cdot m$Fe$_2$O$_3$ and the appearance of FeO$_2$. Here, based on the results of \\emph{in situ} single-crystal X-ray diffraction, M\\\"ossbauer spectroscopy, X-ray absorption spectroscopy, and DFT+dynamical mean-field theory calculations we demonstrate that iron in high pressure cubic FeO$_2$ and isostructural FeO$_2$H$_{0.5}$ is ferric (Fe$^{3+}$), and oxygen has a formal valence less than two. Reduction of oxygen valence from 2, common"},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"1905.05497","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.geo-ph","submitted_at":"2019-05-14T10:12:08Z","cross_cats_sorted":[],"title_canon_sha256":"42d5f26333d3327d439a03a4426e8479d82860dc478c7869920694e2a1643eee","abstract_canon_sha256":"7c921cf0222613e31883b6dbe16e8b83563d6abb255b3361675346b0632939b7"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T02:23:41.647006Z","signature_b64":"JRzG1KaHNPXmK3lZ0M8fiPGBUe0tap3yJ53ios1CHk5Wu0eJLo8UGz4W0xBY5eAOJXmvgwcPRXtHGkmWs7MWCg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"bbe5fbba50383dda8a8627da2379f9ebadd383cd9763559b105e6110e8d4a285","last_reissued_at":"2026-07-05T02:23:41.646494Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T02:23:41.646494Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Revealing the complex nature of bonding in binary high-pressure compound FeO$_2$","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"physics.geo-ph","authors_text":"A.D. Rosa, A. V. Ponomareva, C. McCammon, E. Bykova, E. Koemets, G. Aprilis, H.-P. Liermann, I. A. Abrikosov, I. Leonov, J. Haines, J. Rouquette, K. Glazyrin, L. Dubrovinsky, M. Bykov, M. Hanfland, N. Dubrovinskaia, R. Torchio, S. Chariton, S. Cl\\'ement, T. Fedotenko, T. Irifune, V. B. Prakapenka, V. Cerantola, V. Svitlyk","submitted_at":"2019-05-14T10:12:08Z","abstract_excerpt":"Extreme pressures and temperatures are known to drastically affect the chemistry of iron oxides resulting in numerous compounds forming homologous series $n$FeO$\\cdot m$Fe$_2$O$_3$ and the appearance of FeO$_2$. Here, based on the results of \\emph{in situ} single-crystal X-ray diffraction, M\\\"ossbauer spectroscopy, X-ray absorption spectroscopy, and DFT+dynamical mean-field theory calculations we demonstrate that iron in high pressure cubic FeO$_2$ and isostructural FeO$_2$H$_{0.5}$ is ferric (Fe$^{3+}$), and oxygen has a formal valence less than two. Reduction of oxygen valence from 2, common"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1905.05497","kind":"arxiv","version":2},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/1905.05497/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"},"aliases":[{"alias_kind":"arxiv","alias_value":"1905.05497","created_at":"2026-07-05T02:23:41.646555+00:00"},{"alias_kind":"arxiv_version","alias_value":"1905.05497v2","created_at":"2026-07-05T02:23:41.646555+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1905.05497","created_at":"2026-07-05T02:23:41.646555+00:00"},{"alias_kind":"pith_short_12","alias_value":"XPS7XOSQHA65","created_at":"2026-07-05T02:23:41.646555+00:00"},{"alias_kind":"pith_short_16","alias_value":"XPS7XOSQHA65VCUG","created_at":"2026-07-05T02:23:41.646555+00:00"},{"alias_kind":"pith_short_8","alias_value":"XPS7XOSQ","created_at":"2026-07-05T02:23:41.646555+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":0,"internal_anchor_count":0,"sample":[]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/XPS7XOSQHA65VCUGE7NCG6PZ5O","json":"https://pith.science/pith/XPS7XOSQHA65VCUGE7NCG6PZ5O.json","graph_json":"https://pith.science/api/pith-number/XPS7XOSQHA65VCUGE7NCG6PZ5O/graph.json","events_json":"https://pith.science/api/pith-number/XPS7XOSQHA65VCUGE7NCG6PZ5O/events.json","paper":"https://pith.science/paper/XPS7XOSQ"},"agent_actions":{"view_html":"https://pith.science/pith/XPS7XOSQHA65VCUGE7NCG6PZ5O","download_json":"https://pith.science/pith/XPS7XOSQHA65VCUGE7NCG6PZ5O.json","view_paper":"https://pith.science/paper/XPS7XOSQ","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1905.05497&json=true","fetch_graph":"https://pith.science/api/pith-number/XPS7XOSQHA65VCUGE7NCG6PZ5O/graph.json","fetch_events":"https://pith.science/api/pith-number/XPS7XOSQHA65VCUGE7NCG6PZ5O/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/XPS7XOSQHA65VCUGE7NCG6PZ5O/action/timestamp_anchor","attest_storage":"https://pith.science/pith/XPS7XOSQHA65VCUGE7NCG6PZ5O/action/storage_attestation","attest_author":"https://pith.science/pith/XPS7XOSQHA65VCUGE7NCG6PZ5O/action/author_attestation","sign_citation":"https://pith.science/pith/XPS7XOSQHA65VCUGE7NCG6PZ5O/action/citation_signature","submit_replication":"https://pith.science/pith/XPS7XOSQHA65VCUGE7NCG6PZ5O/action/replication_record"}},"created_at":"2026-07-05T02:23:41.646555+00:00","updated_at":"2026-07-05T02:23:41.646555+00:00"}