{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2019:XPS7XOSQHA65VCUGE7NCG6PZ5O","short_pith_number":"pith:XPS7XOSQ","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"},"canonical_sha256":"bbe5fbba50383dda8a8627da2379f9ebadd383cd9763559b105e6110e8d4a285","source":{"kind":"arxiv","id":"1905.05497","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1905.05497","created_at":"2026-07-05T02:23:41Z"},{"alias_kind":"arxiv_version","alias_value":"1905.05497v2","created_at":"2026-07-05T02:23:41Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1905.05497","created_at":"2026-07-05T02:23:41Z"},{"alias_kind":"pith_short_12","alias_value":"XPS7XOSQHA65","created_at":"2026-07-05T02:23:41Z"},{"alias_kind":"pith_short_16","alias_value":"XPS7XOSQHA65VCUG","created_at":"2026-07-05T02:23:41Z"},{"alias_kind":"pith_short_8","alias_value":"XPS7XOSQ","created_at":"2026-07-05T02:23:41Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2019:XPS7XOSQHA65VCUGE7NCG6PZ5O","target":"record","payload":{"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"},"canonical_sha256":"bbe5fbba50383dda8a8627da2379f9ebadd383cd9763559b105e6110e8d4a285","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"},"source_kind":"arxiv","source_id":"1905.05497","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T02:23:41Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"ljuxnN0joYnuKLidifaOeX5qqli54JumdjfGALfKLks5a2awv36stCFHZZSmTqe9ak1g6kuyE3pM3Q20xCB8DQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-08T17:19:08.103879Z"},"content_sha256":"85721abf07ed5d8f3d0961c012956c30fe6e4d6a7ebca374058a6484ef273b09","schema_version":"1.0","event_id":"sha256:85721abf07ed5d8f3d0961c012956c30fe6e4d6a7ebca374058a6484ef273b09"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2019:XPS7XOSQHA65VCUGE7NCG6PZ5O","target":"graph","payload":{"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"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T02:23:41Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Pj0XzFMOCObg4mAuBR0glR1VM/BHBVV0N75mq8QGn7txKLJwwkKssRiJBRWstuauGXwM9VRL82VmVzBpyLZcBQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-08T17:19:08.104240Z"},"content_sha256":"eae73c64384522aae92c190765992214093a29b5002ed4c6acfa219b3274546d","schema_version":"1.0","event_id":"sha256:eae73c64384522aae92c190765992214093a29b5002ed4c6acfa219b3274546d"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/XPS7XOSQHA65VCUGE7NCG6PZ5O/bundle.json","state_url":"https://pith.science/pith/XPS7XOSQHA65VCUGE7NCG6PZ5O/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/XPS7XOSQHA65VCUGE7NCG6PZ5O/bundle.json","status":"primary"}],"public_keys":[{"key_id":"pith-v1-2026-05","algorithm":"ed25519","format":"raw","public_key_b64":"stVStoiQhXFxp4s2pdzPNoqVNBMojDU/fJ2db5S3CbM=","public_key_hex":"b2d552b68890857171a78b36a5dccf368a953413288c353f7c9d9d6f94b709b3","fingerprint_sha256_b32_first128bits":"RVFV5Z2OI2J3ZUO7ERDEBCYNKS","fingerprint_sha256_hex":"8d4b5ee74e4693bcd1df2446408b0d54","rotates_at":null,"url":"https://pith.science/pith-signing-key.json","notes":"Pith uses this Ed25519 key to sign canonical record SHA-256 digests. Verify with: ed25519_verify(public_key, message=canonical_sha256_bytes, signature=base64decode(signature_b64))."}],"merge_version":"pith-open-graph-merge-v1","built_at":"2026-07-08T17:19:08Z","links":{"resolver":"https://pith.science/pith/XPS7XOSQHA65VCUGE7NCG6PZ5O","bundle":"https://pith.science/pith/XPS7XOSQHA65VCUGE7NCG6PZ5O/bundle.json","state":"https://pith.science/pith/XPS7XOSQHA65VCUGE7NCG6PZ5O/state.json","well_known_bundle":"https://pith.science/.well-known/pith/XPS7XOSQHA65VCUGE7NCG6PZ5O/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:XPS7XOSQHA65VCUGE7NCG6PZ5O","merge_version":"pith-open-graph-merge-v1","event_count":2,"valid_event_count":2,"invalid_event_count":0,"equivocation_count":0,"current":{"canonical_record":{"metadata":{"abstract_canon_sha256":"7c921cf0222613e31883b6dbe16e8b83563d6abb255b3361675346b0632939b7","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.geo-ph","submitted_at":"2019-05-14T10:12:08Z","title_canon_sha256":"42d5f26333d3327d439a03a4426e8479d82860dc478c7869920694e2a1643eee"},"schema_version":"1.0","source":{"id":"1905.05497","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1905.05497","created_at":"2026-07-05T02:23:41Z"},{"alias_kind":"arxiv_version","alias_value":"1905.05497v2","created_at":"2026-07-05T02:23:41Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1905.05497","created_at":"2026-07-05T02:23:41Z"},{"alias_kind":"pith_short_12","alias_value":"XPS7XOSQHA65","created_at":"2026-07-05T02:23:41Z"},{"alias_kind":"pith_short_16","alias_value":"XPS7XOSQHA65VCUG","created_at":"2026-07-05T02:23:41Z"},{"alias_kind":"pith_short_8","alias_value":"XPS7XOSQ","created_at":"2026-07-05T02:23:41Z"}],"graph_snapshots":[{"event_id":"sha256:eae73c64384522aae92c190765992214093a29b5002ed4c6acfa219b3274546d","target":"graph","created_at":"2026-07-05T02:23:41Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"graph_snapshot":{"author_claims":{"count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","strong_count":0},"builder_version":"pith-number-builder-2026-05-17-v1","claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/1905.05497/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"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","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","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.geo-ph","submitted_at":"2019-05-14T10:12:08Z","title":"Revealing the complex nature of bonding in binary high-pressure compound FeO$_2$"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1905.05497","kind":"arxiv","version":2},"verdict":{"created_at":null,"id":null,"model_set":{},"one_line_summary":"","pipeline_version":null,"pith_extraction_headline":"","strongest_claim":"","weakest_assumption":""}},"verdict_id":null}}],"author_attestations":[],"timestamp_anchors":[],"storage_attestations":[],"citation_signatures":[],"replication_records":[],"corrections":[],"mirror_hints":[],"record_created":{"event_id":"sha256:85721abf07ed5d8f3d0961c012956c30fe6e4d6a7ebca374058a6484ef273b09","target":"record","created_at":"2026-07-05T02:23:41Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"attestation_state":"computed","canonical_record":{"metadata":{"abstract_canon_sha256":"7c921cf0222613e31883b6dbe16e8b83563d6abb255b3361675346b0632939b7","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.geo-ph","submitted_at":"2019-05-14T10:12:08Z","title_canon_sha256":"42d5f26333d3327d439a03a4426e8479d82860dc478c7869920694e2a1643eee"},"schema_version":"1.0","source":{"id":"1905.05497","kind":"arxiv","version":2}},"canonical_sha256":"bbe5fbba50383dda8a8627da2379f9ebadd383cd9763559b105e6110e8d4a285","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"bbe5fbba50383dda8a8627da2379f9ebadd383cd9763559b105e6110e8d4a285","first_computed_at":"2026-07-05T02:23:41.646494Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T02:23:41.646494Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"JRzG1KaHNPXmK3lZ0M8fiPGBUe0tap3yJ53ios1CHk5Wu0eJLo8UGz4W0xBY5eAOJXmvgwcPRXtHGkmWs7MWCg==","signature_status":"signed_v1","signed_at":"2026-07-05T02:23:41.647006Z","signed_message":"canonical_sha256_bytes"},"source_id":"1905.05497","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:85721abf07ed5d8f3d0961c012956c30fe6e4d6a7ebca374058a6484ef273b09","sha256:eae73c64384522aae92c190765992214093a29b5002ed4c6acfa219b3274546d"],"state_sha256":"7165fccc4493e819e4fdfc18e70a2d3844316c3d064d0e9b5c8ba3e10f2468c9"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Nc+qOhqvO5ikfg0PPZJ/7C6v9LoNwChl3JhhQHbdSVonv98a44IUHZIX8PGuaQd520g3IdPXL36kYC6oTvdpCA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-08T17:19:08.106109Z","bundle_sha256":"e35fed17f6603ee0c3a0ba23cba7d1ea87b47570182b897123aeca2251d8c85b"}}