{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2017:YFVDTJ45NZSDLMVGZYSAVB5V5U","short_pith_number":"pith:YFVDTJ45","schema_version":"1.0","canonical_sha256":"c16a39a79d6e6435b2a6ce240a87b5ed3cc86fc0e18e5500f59cd255db5a7c7b","source":{"kind":"arxiv","id":"1707.06084","version":1},"attestation_state":"computed","paper":{"title":"Raman spectroscopy and X-ray diffraction of sp3-CaCO3 at lower mantle pressures","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"physics.geo-ph","authors_text":"Alexander F. Goncharov, Artem I. Samtsevich, Artem R. Oganov, Eran Greenberg, Konstantin D. Litasov, Naira S. Martirosyan, Pavel N. Gavryushkin, Sergey S. Lobanov, Vitali B. Prakapenka, Vladan Stevanovic, Xiao Dong","submitted_at":"2017-07-19T13:40:55Z","abstract_excerpt":"The exceptional ability of carbon to form sp2 and sp3 bonding states leads to a great structural and chemical diversity of carbon-bearing phases at non-ambient conditions. Here we use laser-heated diamond anvil cells combined with synchrotron x-ray diffraction, Raman spectroscopy, and first-principles calculations to explore phase transitions in CaCO3 at P > 40 GPa. We find that post-aragonite CaCO3 transforms to the previously predicted P21/c-CaCO3 with sp3-hybridized carbon at 105 GPa (~30 GPa higher than the theoretically predicted crossover pressure). The lowest enthalpy transition path to"},"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":"1707.06084","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.geo-ph","submitted_at":"2017-07-19T13:40:55Z","cross_cats_sorted":[],"title_canon_sha256":"08c12898ecdb3f1281a1246662a32b584e4eeb56408f4e2b09f4c4b86812610a","abstract_canon_sha256":"ac8398f1285ae5ffa1438e41c2ffadf48489ea5b2da40ce7d69da75cba5515e2"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:35:58.289532Z","signature_b64":"mEbzGMmkQF2uLi1PunyILTVfSDAxGEiwEpvIl0ue4Q7sDTbV+QIbO5aVWBQX7sLJsrwQKTxNDAArYKLyWVJpCg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"c16a39a79d6e6435b2a6ce240a87b5ed3cc86fc0e18e5500f59cd255db5a7c7b","last_reissued_at":"2026-05-18T00:35:58.288784Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:35:58.288784Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Raman spectroscopy and X-ray diffraction of sp3-CaCO3 at lower mantle pressures","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"physics.geo-ph","authors_text":"Alexander F. Goncharov, Artem I. Samtsevich, Artem R. Oganov, Eran Greenberg, Konstantin D. Litasov, Naira S. Martirosyan, Pavel N. Gavryushkin, Sergey S. Lobanov, Vitali B. Prakapenka, Vladan Stevanovic, Xiao Dong","submitted_at":"2017-07-19T13:40:55Z","abstract_excerpt":"The exceptional ability of carbon to form sp2 and sp3 bonding states leads to a great structural and chemical diversity of carbon-bearing phases at non-ambient conditions. Here we use laser-heated diamond anvil cells combined with synchrotron x-ray diffraction, Raman spectroscopy, and first-principles calculations to explore phase transitions in CaCO3 at P > 40 GPa. We find that post-aragonite CaCO3 transforms to the previously predicted P21/c-CaCO3 with sp3-hybridized carbon at 105 GPa (~30 GPa higher than the theoretically predicted crossover pressure). The lowest enthalpy transition path to"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1707.06084","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"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":"1707.06084","created_at":"2026-05-18T00:35:58.288884+00:00"},{"alias_kind":"arxiv_version","alias_value":"1707.06084v1","created_at":"2026-05-18T00:35:58.288884+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1707.06084","created_at":"2026-05-18T00:35:58.288884+00:00"},{"alias_kind":"pith_short_12","alias_value":"YFVDTJ45NZSD","created_at":"2026-05-18T12:31:56.362134+00:00"},{"alias_kind":"pith_short_16","alias_value":"YFVDTJ45NZSDLMVG","created_at":"2026-05-18T12:31:56.362134+00:00"},{"alias_kind":"pith_short_8","alias_value":"YFVDTJ45","created_at":"2026-05-18T12:31:56.362134+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/YFVDTJ45NZSDLMVGZYSAVB5V5U","json":"https://pith.science/pith/YFVDTJ45NZSDLMVGZYSAVB5V5U.json","graph_json":"https://pith.science/api/pith-number/YFVDTJ45NZSDLMVGZYSAVB5V5U/graph.json","events_json":"https://pith.science/api/pith-number/YFVDTJ45NZSDLMVGZYSAVB5V5U/events.json","paper":"https://pith.science/paper/YFVDTJ45"},"agent_actions":{"view_html":"https://pith.science/pith/YFVDTJ45NZSDLMVGZYSAVB5V5U","download_json":"https://pith.science/pith/YFVDTJ45NZSDLMVGZYSAVB5V5U.json","view_paper":"https://pith.science/paper/YFVDTJ45","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1707.06084&json=true","fetch_graph":"https://pith.science/api/pith-number/YFVDTJ45NZSDLMVGZYSAVB5V5U/graph.json","fetch_events":"https://pith.science/api/pith-number/YFVDTJ45NZSDLMVGZYSAVB5V5U/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/YFVDTJ45NZSDLMVGZYSAVB5V5U/action/timestamp_anchor","attest_storage":"https://pith.science/pith/YFVDTJ45NZSDLMVGZYSAVB5V5U/action/storage_attestation","attest_author":"https://pith.science/pith/YFVDTJ45NZSDLMVGZYSAVB5V5U/action/author_attestation","sign_citation":"https://pith.science/pith/YFVDTJ45NZSDLMVGZYSAVB5V5U/action/citation_signature","submit_replication":"https://pith.science/pith/YFVDTJ45NZSDLMVGZYSAVB5V5U/action/replication_record"}},"created_at":"2026-05-18T00:35:58.288884+00:00","updated_at":"2026-05-18T00:35:58.288884+00:00"}