{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2015:CT4R7KFN44Q7JANYTZOZLZJVPT","short_pith_number":"pith:CT4R7KFN","schema_version":"1.0","canonical_sha256":"14f91fa8ade721f481b89e5d95e5357cfd8fe6b245cb25a56db337306c4cd9b9","source":{"kind":"arxiv","id":"1505.02635","version":1},"attestation_state":"computed","paper":{"title":"Divacancy superstructures in thermoelectric calcium-doped sodium cobaltate","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cond-mat.str-el","authors_text":"A. T. Boothroyd, D. G. Porter, D. Prabhakaran, J. P. Goff, M. J. Gutmann, M. Roger, M. S. Pandiyan, S. Uthayakumar","submitted_at":"2015-05-11T14:15:11Z","abstract_excerpt":"We have grown single crystals of Na$_x$Ca$_y$CoO$_2$ and determined their superstructures as a function of composition using neutron and x-ray diffraction. Inclusion of Ca$^{2+}$ stabilises a single superstructure across a wide range of temperatures and concentrations. The superstructure in the Na$^+$ layers is based on arrays of divacancy clusters with Ca$^{2+}$ ions occupying the central site, and it has an ideal concentration Na$_{4/7}$Ca$_{1/7}$CoO$_2$. Previous measurements of the thermoelectric properties on this system are discussed in light of this superstructure. Na$_{4/7}$Ca$_{1/7}$C"},"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":"1505.02635","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.str-el","submitted_at":"2015-05-11T14:15:11Z","cross_cats_sorted":[],"title_canon_sha256":"f683ca3e2c0175556274278cf45f7cb107f6ac75daf603787b8f279c0d738cba","abstract_canon_sha256":"cb0f8083873fb70b12ba235acd98102fc64bff5a21e3471a1f24622608ed0087"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:16:12.010876Z","signature_b64":"4ha7xHFowcykibXWZ8DJEUqGByP4WV5MpqefiCCndcAe/wQcH2tWaav9VALcDl3ggoAm/8+rcIY6Um7NcDajDw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"14f91fa8ade721f481b89e5d95e5357cfd8fe6b245cb25a56db337306c4cd9b9","last_reissued_at":"2026-05-18T02:16:12.010161Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:16:12.010161Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Divacancy superstructures in thermoelectric calcium-doped sodium cobaltate","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cond-mat.str-el","authors_text":"A. T. Boothroyd, D. G. Porter, D. Prabhakaran, J. P. Goff, M. J. Gutmann, M. Roger, M. S. Pandiyan, S. Uthayakumar","submitted_at":"2015-05-11T14:15:11Z","abstract_excerpt":"We have grown single crystals of Na$_x$Ca$_y$CoO$_2$ and determined their superstructures as a function of composition using neutron and x-ray diffraction. Inclusion of Ca$^{2+}$ stabilises a single superstructure across a wide range of temperatures and concentrations. The superstructure in the Na$^+$ layers is based on arrays of divacancy clusters with Ca$^{2+}$ ions occupying the central site, and it has an ideal concentration Na$_{4/7}$Ca$_{1/7}$CoO$_2$. Previous measurements of the thermoelectric properties on this system are discussed in light of this superstructure. Na$_{4/7}$Ca$_{1/7}$C"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1505.02635","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":"1505.02635","created_at":"2026-05-18T02:16:12.010263+00:00"},{"alias_kind":"arxiv_version","alias_value":"1505.02635v1","created_at":"2026-05-18T02:16:12.010263+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1505.02635","created_at":"2026-05-18T02:16:12.010263+00:00"},{"alias_kind":"pith_short_12","alias_value":"CT4R7KFN44Q7","created_at":"2026-05-18T12:29:17.054201+00:00"},{"alias_kind":"pith_short_16","alias_value":"CT4R7KFN44Q7JANY","created_at":"2026-05-18T12:29:17.054201+00:00"},{"alias_kind":"pith_short_8","alias_value":"CT4R7KFN","created_at":"2026-05-18T12:29:17.054201+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/CT4R7KFN44Q7JANYTZOZLZJVPT","json":"https://pith.science/pith/CT4R7KFN44Q7JANYTZOZLZJVPT.json","graph_json":"https://pith.science/api/pith-number/CT4R7KFN44Q7JANYTZOZLZJVPT/graph.json","events_json":"https://pith.science/api/pith-number/CT4R7KFN44Q7JANYTZOZLZJVPT/events.json","paper":"https://pith.science/paper/CT4R7KFN"},"agent_actions":{"view_html":"https://pith.science/pith/CT4R7KFN44Q7JANYTZOZLZJVPT","download_json":"https://pith.science/pith/CT4R7KFN44Q7JANYTZOZLZJVPT.json","view_paper":"https://pith.science/paper/CT4R7KFN","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1505.02635&json=true","fetch_graph":"https://pith.science/api/pith-number/CT4R7KFN44Q7JANYTZOZLZJVPT/graph.json","fetch_events":"https://pith.science/api/pith-number/CT4R7KFN44Q7JANYTZOZLZJVPT/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/CT4R7KFN44Q7JANYTZOZLZJVPT/action/timestamp_anchor","attest_storage":"https://pith.science/pith/CT4R7KFN44Q7JANYTZOZLZJVPT/action/storage_attestation","attest_author":"https://pith.science/pith/CT4R7KFN44Q7JANYTZOZLZJVPT/action/author_attestation","sign_citation":"https://pith.science/pith/CT4R7KFN44Q7JANYTZOZLZJVPT/action/citation_signature","submit_replication":"https://pith.science/pith/CT4R7KFN44Q7JANYTZOZLZJVPT/action/replication_record"}},"created_at":"2026-05-18T02:16:12.010263+00:00","updated_at":"2026-05-18T02:16:12.010263+00:00"}