{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2020:7G4QXCSZGYQKBROOEH3MYJ35L7","short_pith_number":"pith:7G4QXCSZ","canonical_record":{"source":{"id":"2002.10912","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2020-02-25T14:51:01Z","cross_cats_sorted":["physics.app-ph"],"title_canon_sha256":"5bc6a4288d1c9d105ebbff4c75bb0202254191eb91414dd7b9a92503007b17ac","abstract_canon_sha256":"21e313a97a25ee86e5e049a4eb2a592578e0a79be5c379e51818018bf563425e"},"schema_version":"1.0"},"canonical_sha256":"f9b90b8a593620a0c5ce21f6cc277d5fe3e5e4ff4e0389982c6135988896913f","source":{"kind":"arxiv","id":"2002.10912","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2002.10912","created_at":"2026-07-05T01:16:45Z"},{"alias_kind":"arxiv_version","alias_value":"2002.10912v1","created_at":"2026-07-05T01:16:45Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2002.10912","created_at":"2026-07-05T01:16:45Z"},{"alias_kind":"pith_short_12","alias_value":"7G4QXCSZGYQK","created_at":"2026-07-05T01:16:45Z"},{"alias_kind":"pith_short_16","alias_value":"7G4QXCSZGYQKBROO","created_at":"2026-07-05T01:16:45Z"},{"alias_kind":"pith_short_8","alias_value":"7G4QXCSZ","created_at":"2026-07-05T01:16:45Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2020:7G4QXCSZGYQKBROOEH3MYJ35L7","target":"record","payload":{"canonical_record":{"source":{"id":"2002.10912","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2020-02-25T14:51:01Z","cross_cats_sorted":["physics.app-ph"],"title_canon_sha256":"5bc6a4288d1c9d105ebbff4c75bb0202254191eb91414dd7b9a92503007b17ac","abstract_canon_sha256":"21e313a97a25ee86e5e049a4eb2a592578e0a79be5c379e51818018bf563425e"},"schema_version":"1.0"},"canonical_sha256":"f9b90b8a593620a0c5ce21f6cc277d5fe3e5e4ff4e0389982c6135988896913f","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T01:16:45.535273Z","signature_b64":"MnPjpwegiUqseaMz7Gt6/HfX8qhgdQq4IWs1+cCrsasWnhyQwfzvWCqvp9+ucZOMV02zvFejTS5DIoiYWC9UBA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"f9b90b8a593620a0c5ce21f6cc277d5fe3e5e4ff4e0389982c6135988896913f","last_reissued_at":"2026-07-05T01:16:45.534880Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T01:16:45.534880Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2002.10912","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":"2026-07-05T01:16:45Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"6yTbWVPH7ofBsKLTMWqcy1a+EA+rkpFtONABgM5P8UVhOLJaXj/huwxhA1LwKYq/reTpb5eK1TKRldhVDS60Bw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-07T05:09:18.669582Z"},"content_sha256":"4dd624030b6e094ae3ef26b51eb78cf1d1949f1311e03907dd459b5e191041a5","schema_version":"1.0","event_id":"sha256:4dd624030b6e094ae3ef26b51eb78cf1d1949f1311e03907dd459b5e191041a5"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2020:7G4QXCSZGYQKBROOEH3MYJ35L7","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Understanding the Instability of the Halide Perovskite CsPbI$_3$ through Temperature-Dependent Structural Analysis","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["physics.app-ph"],"primary_cat":"cond-mat.mtrl-sci","authors_text":"Daniel B. Straus, Milinda Abeykoon, Robert J. Cava, Shu Guo","submitted_at":"2020-02-25T14:51:01Z","abstract_excerpt":"Despite the tremendous interest in halide perovskites in solar cells, the reason that the all-inorganic perovskite CsPbI$_3$ is unstable at room temperature remains mysterious. Here single-crystal X-ray diffraction and powder pair distribution function (PDF) measurements characterize bulk perovskite CsPbI$_3$ from 100 to 295 K to elucidate its thermodynamic instability. While Cs occupies a single site from 100 to 150 K, it splits between two sites from 175 to 295 K with the second site having a lower effective coordination number, which along with other structural parameters suggests that Cs r"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2002.10912","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/2002.10912/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":"2026-07-05T01:16:45Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"0Z0veMnaXzhgrOxRMP3KvNqVYQ4obk6D/sQ9vU/J5KTXI8fBKgO+xpc8aR2vU9BYQ+u0B0qLRqB0m45ZOXtPBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-07T05:09:18.669972Z"},"content_sha256":"cdc6ac266bb337be11db0fea4b5c3f3543f60ad2c806462e92650e85c23dd033","schema_version":"1.0","event_id":"sha256:cdc6ac266bb337be11db0fea4b5c3f3543f60ad2c806462e92650e85c23dd033"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/7G4QXCSZGYQKBROOEH3MYJ35L7/bundle.json","state_url":"https://pith.science/pith/7G4QXCSZGYQKBROOEH3MYJ35L7/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/7G4QXCSZGYQKBROOEH3MYJ35L7/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":"2026-08-07T05:09:18Z","links":{"resolver":"https://pith.science/pith/7G4QXCSZGYQKBROOEH3MYJ35L7","bundle":"https://pith.science/pith/7G4QXCSZGYQKBROOEH3MYJ35L7/bundle.json","state":"https://pith.science/pith/7G4QXCSZGYQKBROOEH3MYJ35L7/state.json","well_known_bundle":"https://pith.science/.well-known/pith/7G4QXCSZGYQKBROOEH3MYJ35L7/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2020:7G4QXCSZGYQKBROOEH3MYJ35L7","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":"21e313a97a25ee86e5e049a4eb2a592578e0a79be5c379e51818018bf563425e","cross_cats_sorted":["physics.app-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2020-02-25T14:51:01Z","title_canon_sha256":"5bc6a4288d1c9d105ebbff4c75bb0202254191eb91414dd7b9a92503007b17ac"},"schema_version":"1.0","source":{"id":"2002.10912","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2002.10912","created_at":"2026-07-05T01:16:45Z"},{"alias_kind":"arxiv_version","alias_value":"2002.10912v1","created_at":"2026-07-05T01:16:45Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2002.10912","created_at":"2026-07-05T01:16:45Z"},{"alias_kind":"pith_short_12","alias_value":"7G4QXCSZGYQK","created_at":"2026-07-05T01:16:45Z"},{"alias_kind":"pith_short_16","alias_value":"7G4QXCSZGYQKBROO","created_at":"2026-07-05T01:16:45Z"},{"alias_kind":"pith_short_8","alias_value":"7G4QXCSZ","created_at":"2026-07-05T01:16:45Z"}],"graph_snapshots":[{"event_id":"sha256:cdc6ac266bb337be11db0fea4b5c3f3543f60ad2c806462e92650e85c23dd033","target":"graph","created_at":"2026-07-05T01:16:45Z","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/2002.10912/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Despite the tremendous interest in halide perovskites in solar cells, the reason that the all-inorganic perovskite CsPbI$_3$ is unstable at room temperature remains mysterious. Here single-crystal X-ray diffraction and powder pair distribution function (PDF) measurements characterize bulk perovskite CsPbI$_3$ from 100 to 295 K to elucidate its thermodynamic instability. While Cs occupies a single site from 100 to 150 K, it splits between two sites from 175 to 295 K with the second site having a lower effective coordination number, which along with other structural parameters suggests that Cs r","authors_text":"Daniel B. Straus, Milinda Abeykoon, Robert J. Cava, Shu Guo","cross_cats":["physics.app-ph"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2020-02-25T14:51:01Z","title":"Understanding the Instability of the Halide Perovskite CsPbI$_3$ through Temperature-Dependent Structural Analysis"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2002.10912","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":"sha256:4dd624030b6e094ae3ef26b51eb78cf1d1949f1311e03907dd459b5e191041a5","target":"record","created_at":"2026-07-05T01:16:45Z","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":"21e313a97a25ee86e5e049a4eb2a592578e0a79be5c379e51818018bf563425e","cross_cats_sorted":["physics.app-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2020-02-25T14:51:01Z","title_canon_sha256":"5bc6a4288d1c9d105ebbff4c75bb0202254191eb91414dd7b9a92503007b17ac"},"schema_version":"1.0","source":{"id":"2002.10912","kind":"arxiv","version":1}},"canonical_sha256":"f9b90b8a593620a0c5ce21f6cc277d5fe3e5e4ff4e0389982c6135988896913f","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"f9b90b8a593620a0c5ce21f6cc277d5fe3e5e4ff4e0389982c6135988896913f","first_computed_at":"2026-07-05T01:16:45.534880Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T01:16:45.534880Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"MnPjpwegiUqseaMz7Gt6/HfX8qhgdQq4IWs1+cCrsasWnhyQwfzvWCqvp9+ucZOMV02zvFejTS5DIoiYWC9UBA==","signature_status":"signed_v1","signed_at":"2026-07-05T01:16:45.535273Z","signed_message":"canonical_sha256_bytes"},"source_id":"2002.10912","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:4dd624030b6e094ae3ef26b51eb78cf1d1949f1311e03907dd459b5e191041a5","sha256:cdc6ac266bb337be11db0fea4b5c3f3543f60ad2c806462e92650e85c23dd033"],"state_sha256":"bb0cf994340b029b9ee0f28fcd5303bad21a278f9fa972c2f5a0bb656fad31c7"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"C/iTHmlbtuMhoTp4wp0Uu8XeRWDlS8sSDTythCWSA66o6A1r8Bc5maIy1yFYXzTm/Y+R1OB1rxl48lwXOAbEDw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-07T05:09:18.672768Z","bundle_sha256":"3e81e557cf8951462b4b2f4b310043d6c8ed8c5013aec753b9d60771a97dc892"}}