{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:RS6KNFO5YF7QHS5SHTTB2ULFLQ","short_pith_number":"pith:RS6KNFO5","canonical_record":{"source":{"id":"1804.02228","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2018-04-06T12:25:36Z","cross_cats_sorted":[],"title_canon_sha256":"c8ed4f763be32ffe0651c8ba090b6ea976b635225686906cc883997443ed2525","abstract_canon_sha256":"f3c48bc50904284247b957ebdaea9688f12f67427a8814c0fbab82919f779e2e"},"schema_version":"1.0"},"canonical_sha256":"8cbca695ddc17f03cbb23ce61d51655c38dd29642a90059bb2a74dc586eb2b31","source":{"kind":"arxiv","id":"1804.02228","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1804.02228","created_at":"2026-05-18T00:01:29Z"},{"alias_kind":"arxiv_version","alias_value":"1804.02228v1","created_at":"2026-05-18T00:01:29Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1804.02228","created_at":"2026-05-18T00:01:29Z"},{"alias_kind":"pith_short_12","alias_value":"RS6KNFO5YF7Q","created_at":"2026-05-18T12:32:50Z"},{"alias_kind":"pith_short_16","alias_value":"RS6KNFO5YF7QHS5S","created_at":"2026-05-18T12:32:50Z"},{"alias_kind":"pith_short_8","alias_value":"RS6KNFO5","created_at":"2026-05-18T12:32:50Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:RS6KNFO5YF7QHS5SHTTB2ULFLQ","target":"record","payload":{"canonical_record":{"source":{"id":"1804.02228","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2018-04-06T12:25:36Z","cross_cats_sorted":[],"title_canon_sha256":"c8ed4f763be32ffe0651c8ba090b6ea976b635225686906cc883997443ed2525","abstract_canon_sha256":"f3c48bc50904284247b957ebdaea9688f12f67427a8814c0fbab82919f779e2e"},"schema_version":"1.0"},"canonical_sha256":"8cbca695ddc17f03cbb23ce61d51655c38dd29642a90059bb2a74dc586eb2b31","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:01:29.881758Z","signature_b64":"N5dmskRnC9XoTE+vjQO3XExQikNrCiWyd+HSyfg1DXZtrnIg1Vfm2I8c0H93a4x0H43HKl247Pv192jfRV1zCQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"8cbca695ddc17f03cbb23ce61d51655c38dd29642a90059bb2a74dc586eb2b31","last_reissued_at":"2026-05-18T00:01:29.881332Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:01:29.881332Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1804.02228","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":"2026-05-18T00:01:29Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"hKST2xJ2QyGMdengwgqxfAhgDWO82owE0b4HZQ+UTZGjX8eKOV1hSCYRu7fomRCh14NSxuynALxSJFi3hd5/Bw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-05T20:11:53.731501Z"},"content_sha256":"4e3775d46eee759020808cd394e0863994e14d749c30b5b57b02a16a6619e764","schema_version":"1.0","event_id":"sha256:4e3775d46eee759020808cd394e0863994e14d749c30b5b57b02a16a6619e764"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:RS6KNFO5YF7QHS5SHTTB2ULFLQ","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Polymorphism in Bi-based perovskite oxides: a first-principles study","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cond-mat.mtrl-sci","authors_text":"Akansha Singh, Enric Canadell, Jorge \\'I\\~niguez, Oswaldo Di\\'eguez, Viveka N. Singh","submitted_at":"2018-04-06T12:25:36Z","abstract_excerpt":"Under normal conditions, bulk crystals of BiScO$_3$ , BiCrO$_3$, BiMnO$_3$, BiFeO$_3$, and BiCoO$_3$ present three very different variations of the perovskite structure: an antipolar phase, a rhombohedral phase with a large polarization along the space diagonal of the pseudocubic unit cell, and a supertetragonal phase with even larger polarization. With the aim of understanding the causes for this variety, we have used a genetic algorithm to search for minima in the surface energy of these materials. Our results show that the number of these minima is very large when compared to that of typica"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1804.02228","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"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T00:01:29Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"+4ZPsYQq58D+PmWPfkOfl7JXRLmPO1be8pIlBgLvqrQ7+o4gVxG/xINc9lKdVjVS1WsvDJsF73uQPH1lkWIpDA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-05T20:11:53.732286Z"},"content_sha256":"0b1b4f93c265e72479f785f19afdb77f53c286128394ec4376f2d6e993d76a53","schema_version":"1.0","event_id":"sha256:0b1b4f93c265e72479f785f19afdb77f53c286128394ec4376f2d6e993d76a53"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/RS6KNFO5YF7QHS5SHTTB2ULFLQ/bundle.json","state_url":"https://pith.science/pith/RS6KNFO5YF7QHS5SHTTB2ULFLQ/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/RS6KNFO5YF7QHS5SHTTB2ULFLQ/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":"2026-06-05T20:11:53Z","links":{"resolver":"https://pith.science/pith/RS6KNFO5YF7QHS5SHTTB2ULFLQ","bundle":"https://pith.science/pith/RS6KNFO5YF7QHS5SHTTB2ULFLQ/bundle.json","state":"https://pith.science/pith/RS6KNFO5YF7QHS5SHTTB2ULFLQ/state.json","well_known_bundle":"https://pith.science/.well-known/pith/RS6KNFO5YF7QHS5SHTTB2ULFLQ/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:RS6KNFO5YF7QHS5SHTTB2ULFLQ","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":"f3c48bc50904284247b957ebdaea9688f12f67427a8814c0fbab82919f779e2e","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2018-04-06T12:25:36Z","title_canon_sha256":"c8ed4f763be32ffe0651c8ba090b6ea976b635225686906cc883997443ed2525"},"schema_version":"1.0","source":{"id":"1804.02228","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1804.02228","created_at":"2026-05-18T00:01:29Z"},{"alias_kind":"arxiv_version","alias_value":"1804.02228v1","created_at":"2026-05-18T00:01:29Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1804.02228","created_at":"2026-05-18T00:01:29Z"},{"alias_kind":"pith_short_12","alias_value":"RS6KNFO5YF7Q","created_at":"2026-05-18T12:32:50Z"},{"alias_kind":"pith_short_16","alias_value":"RS6KNFO5YF7QHS5S","created_at":"2026-05-18T12:32:50Z"},{"alias_kind":"pith_short_8","alias_value":"RS6KNFO5","created_at":"2026-05-18T12:32:50Z"}],"graph_snapshots":[{"event_id":"sha256:0b1b4f93c265e72479f785f19afdb77f53c286128394ec4376f2d6e993d76a53","target":"graph","created_at":"2026-05-18T00:01:29Z","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"},"paper":{"abstract_excerpt":"Under normal conditions, bulk crystals of BiScO$_3$ , BiCrO$_3$, BiMnO$_3$, BiFeO$_3$, and BiCoO$_3$ present three very different variations of the perovskite structure: an antipolar phase, a rhombohedral phase with a large polarization along the space diagonal of the pseudocubic unit cell, and a supertetragonal phase with even larger polarization. With the aim of understanding the causes for this variety, we have used a genetic algorithm to search for minima in the surface energy of these materials. Our results show that the number of these minima is very large when compared to that of typica","authors_text":"Akansha Singh, Enric Canadell, Jorge \\'I\\~niguez, Oswaldo Di\\'eguez, Viveka N. Singh","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2018-04-06T12:25:36Z","title":"Polymorphism in Bi-based perovskite oxides: a first-principles study"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1804.02228","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":"sha256:4e3775d46eee759020808cd394e0863994e14d749c30b5b57b02a16a6619e764","target":"record","created_at":"2026-05-18T00:01:29Z","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":"f3c48bc50904284247b957ebdaea9688f12f67427a8814c0fbab82919f779e2e","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2018-04-06T12:25:36Z","title_canon_sha256":"c8ed4f763be32ffe0651c8ba090b6ea976b635225686906cc883997443ed2525"},"schema_version":"1.0","source":{"id":"1804.02228","kind":"arxiv","version":1}},"canonical_sha256":"8cbca695ddc17f03cbb23ce61d51655c38dd29642a90059bb2a74dc586eb2b31","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"8cbca695ddc17f03cbb23ce61d51655c38dd29642a90059bb2a74dc586eb2b31","first_computed_at":"2026-05-18T00:01:29.881332Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:01:29.881332Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"N5dmskRnC9XoTE+vjQO3XExQikNrCiWyd+HSyfg1DXZtrnIg1Vfm2I8c0H93a4x0H43HKl247Pv192jfRV1zCQ==","signature_status":"signed_v1","signed_at":"2026-05-18T00:01:29.881758Z","signed_message":"canonical_sha256_bytes"},"source_id":"1804.02228","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:4e3775d46eee759020808cd394e0863994e14d749c30b5b57b02a16a6619e764","sha256:0b1b4f93c265e72479f785f19afdb77f53c286128394ec4376f2d6e993d76a53"],"state_sha256":"c23ae8a3d244406bfbc3e78e076860e25531f6e219b518d225f35e0baa28d786"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"NmUBm6lkDaZiaUuf6IJVOuGvEcsnZh3nCSY75+seSSmWXpkw9m8FWokHE6ywJxpQHbPNyx6FuRcTFlGqdC1xCQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-05T20:11:53.736685Z","bundle_sha256":"e86b2134a1baf4f4ceaebb157ac42d759883766c7ad836a5b7036b4616c50c88"}}