{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2026:ZKQXFVL5RF57SAR47QTTMOT6PD","short_pith_number":"pith:ZKQXFVL5","canonical_record":{"source":{"id":"2607.19885","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2026-07-22T08:16:50Z","cross_cats_sorted":[],"title_canon_sha256":"d72a5c5328e0779e6509216486ed548f24633a8642fcfc5cf534995b9a9fd0e7","abstract_canon_sha256":"9bcb76b3078d20dd6593cc252c74ca33aefd36c6fcc45ac5ce0ab3f823c49f61"},"schema_version":"1.0"},"canonical_sha256":"caa172d57d897bf9023cfc27363a7e78f70e13c7ff2bce286587172adf376492","source":{"kind":"arxiv","id":"2607.19885","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2607.19885","created_at":"2026-07-23T01:24:05Z"},{"alias_kind":"arxiv_version","alias_value":"2607.19885v1","created_at":"2026-07-23T01:24:05Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2607.19885","created_at":"2026-07-23T01:24:05Z"},{"alias_kind":"pith_short_12","alias_value":"ZKQXFVL5RF57","created_at":"2026-07-23T01:24:05Z"},{"alias_kind":"pith_short_16","alias_value":"ZKQXFVL5RF57SAR4","created_at":"2026-07-23T01:24:05Z"},{"alias_kind":"pith_short_8","alias_value":"ZKQXFVL5","created_at":"2026-07-23T01:24:05Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2026:ZKQXFVL5RF57SAR47QTTMOT6PD","target":"record","payload":{"canonical_record":{"source":{"id":"2607.19885","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2026-07-22T08:16:50Z","cross_cats_sorted":[],"title_canon_sha256":"d72a5c5328e0779e6509216486ed548f24633a8642fcfc5cf534995b9a9fd0e7","abstract_canon_sha256":"9bcb76b3078d20dd6593cc252c74ca33aefd36c6fcc45ac5ce0ab3f823c49f61"},"schema_version":"1.0"},"canonical_sha256":"caa172d57d897bf9023cfc27363a7e78f70e13c7ff2bce286587172adf376492","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-23T01:24:05.824480Z","signature_b64":"x7zPf5m8wrUI2RbDMxNC2GiuCSRBNmcxdzKkDjnm5NEgtsz3o3mEVsQshqnoPtDlSI/rH2qM6QfC6ICnYe10Bg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"caa172d57d897bf9023cfc27363a7e78f70e13c7ff2bce286587172adf376492","last_reissued_at":"2026-07-23T01:24:05.823681Z","signature_status":"signed_v1","first_computed_at":"2026-07-23T01:24:05.823681Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2607.19885","source_version":1,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-23T01:24:05Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"DtIzy/znecaWbtTBdXjOs6RnqM8iBps0DrqyLnsQBV7xgQH1GOnRSS97KY26v7DGdjMgKtaZrMTRuea4lvCuCg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-15T19:51:14.152629Z"},"content_sha256":"60d454b628c4a162f62369cdbf240710fde02ae284bd0c0a42ae85601ce8ce4a","schema_version":"1.0","event_id":"sha256:60d454b628c4a162f62369cdbf240710fde02ae284bd0c0a42ae85601ce8ce4a"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2026:ZKQXFVL5RF57SAR47QTTMOT6PD","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"The origin of ferroelectricity, polarization and high resistivity in Aurivillius CaBi2B2O9 (B = Ta, Nb)","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cond-mat.mtrl-sci","authors_text":"Fengzhang Tang, Jianguo Zhu, Jie Xing, Qiang Chen, Qi Hu, Shi Wei, Zhi Tan","submitted_at":"2026-07-22T08:16:50Z","abstract_excerpt":"Aurivillius layered oxides are important candidates for high-temperature ferroelectric and piezoelectric application. In this work, we combine group theoretic analysis with first-principles calculations to systematically investigate the origin of ferroelectric phase transition, polarization, piezoelectric response, and intrinsic electrical insulation of the two-layer Aurivillius ferroelectrics CaBi$_{2}$B$_{2}$O$_{9}$ (B = Ta, Nb). The results show that the \\textit{A2$_1$am} ferroelectric phase arises from the cooperative condensation of a polar mode and nonpolar oxygen octahedral rotation/til"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2607.19885","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2607.19885/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":"2026-07-23T01:24:05Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"YppvGEGfiFS/qkcOpf7P/iHa+8kNN2bZupdvlON45/8l56azefVKzlvWxXTEhavbOBROqm0+7isUd3Pa0RRUCQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-15T19:51:14.153304Z"},"content_sha256":"bd10d899dc515b432773bddf22fcc38a0679bec045bddfd5c97608ddb7ae8905","schema_version":"1.0","event_id":"sha256:bd10d899dc515b432773bddf22fcc38a0679bec045bddfd5c97608ddb7ae8905"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/ZKQXFVL5RF57SAR47QTTMOT6PD/bundle.json","state_url":"https://pith.science/pith/ZKQXFVL5RF57SAR47QTTMOT6PD/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/ZKQXFVL5RF57SAR47QTTMOT6PD/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":"2026-08-15T19:51:14Z","links":{"resolver":"https://pith.science/pith/ZKQXFVL5RF57SAR47QTTMOT6PD","bundle":"https://pith.science/pith/ZKQXFVL5RF57SAR47QTTMOT6PD/bundle.json","state":"https://pith.science/pith/ZKQXFVL5RF57SAR47QTTMOT6PD/state.json","well_known_bundle":"https://pith.science/.well-known/pith/ZKQXFVL5RF57SAR47QTTMOT6PD/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2026:ZKQXFVL5RF57SAR47QTTMOT6PD","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":"9bcb76b3078d20dd6593cc252c74ca33aefd36c6fcc45ac5ce0ab3f823c49f61","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2026-07-22T08:16:50Z","title_canon_sha256":"d72a5c5328e0779e6509216486ed548f24633a8642fcfc5cf534995b9a9fd0e7"},"schema_version":"1.0","source":{"id":"2607.19885","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2607.19885","created_at":"2026-07-23T01:24:05Z"},{"alias_kind":"arxiv_version","alias_value":"2607.19885v1","created_at":"2026-07-23T01:24:05Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2607.19885","created_at":"2026-07-23T01:24:05Z"},{"alias_kind":"pith_short_12","alias_value":"ZKQXFVL5RF57","created_at":"2026-07-23T01:24:05Z"},{"alias_kind":"pith_short_16","alias_value":"ZKQXFVL5RF57SAR4","created_at":"2026-07-23T01:24:05Z"},{"alias_kind":"pith_short_8","alias_value":"ZKQXFVL5","created_at":"2026-07-23T01:24:05Z"}],"graph_snapshots":[{"event_id":"sha256:bd10d899dc515b432773bddf22fcc38a0679bec045bddfd5c97608ddb7ae8905","target":"graph","created_at":"2026-07-23T01:24:05Z","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/2607.19885/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Aurivillius layered oxides are important candidates for high-temperature ferroelectric and piezoelectric application. In this work, we combine group theoretic analysis with first-principles calculations to systematically investigate the origin of ferroelectric phase transition, polarization, piezoelectric response, and intrinsic electrical insulation of the two-layer Aurivillius ferroelectrics CaBi$_{2}$B$_{2}$O$_{9}$ (B = Ta, Nb). The results show that the \\textit{A2$_1$am} ferroelectric phase arises from the cooperative condensation of a polar mode and nonpolar oxygen octahedral rotation/til","authors_text":"Fengzhang Tang, Jianguo Zhu, Jie Xing, Qiang Chen, Qi Hu, Shi Wei, Zhi Tan","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2026-07-22T08:16:50Z","title":"The origin of ferroelectricity, polarization and high resistivity in Aurivillius CaBi2B2O9 (B = Ta, Nb)"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2607.19885","kind":"arxiv","version":1},"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":"sha256:60d454b628c4a162f62369cdbf240710fde02ae284bd0c0a42ae85601ce8ce4a","target":"record","created_at":"2026-07-23T01:24:05Z","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":"9bcb76b3078d20dd6593cc252c74ca33aefd36c6fcc45ac5ce0ab3f823c49f61","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2026-07-22T08:16:50Z","title_canon_sha256":"d72a5c5328e0779e6509216486ed548f24633a8642fcfc5cf534995b9a9fd0e7"},"schema_version":"1.0","source":{"id":"2607.19885","kind":"arxiv","version":1}},"canonical_sha256":"caa172d57d897bf9023cfc27363a7e78f70e13c7ff2bce286587172adf376492","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"caa172d57d897bf9023cfc27363a7e78f70e13c7ff2bce286587172adf376492","first_computed_at":"2026-07-23T01:24:05.823681Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-23T01:24:05.823681Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"x7zPf5m8wrUI2RbDMxNC2GiuCSRBNmcxdzKkDjnm5NEgtsz3o3mEVsQshqnoPtDlSI/rH2qM6QfC6ICnYe10Bg==","signature_status":"signed_v1","signed_at":"2026-07-23T01:24:05.824480Z","signed_message":"canonical_sha256_bytes"},"source_id":"2607.19885","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:60d454b628c4a162f62369cdbf240710fde02ae284bd0c0a42ae85601ce8ce4a","sha256:bd10d899dc515b432773bddf22fcc38a0679bec045bddfd5c97608ddb7ae8905"],"state_sha256":"446fb44fe48c85c4c18867bafea9a787616b4c3b1a58de740166d83b1ef19df4"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Q7qs48FQdFk1L4/mtD5/hP0new7hIsbS0sdQN98Z1NnQJGoX62Q2USDm98BSquP/s8o66hZRxhs+voRjh6m+DA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-15T19:51:14.160286Z","bundle_sha256":"219b4885ad4fb9d85a8232fd00595c6e960e7b5b9b45b7cfc610ac1f75da0f60"}}