{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2021:OJVFBFEIETGNMIVYCJAIQ45QW2","short_pith_number":"pith:OJVFBFEI","canonical_record":{"source":{"id":"2104.01640","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2021-04-04T16:19:31Z","cross_cats_sorted":["physics.chem-ph"],"title_canon_sha256":"d99296b8ac207f488981d141d6fdd94303a5288a4fc96f2eaf607e24eaba918b","abstract_canon_sha256":"730eb74f1a7c3bb62625788bb0d1d7e93178a3e8b7c463271ec007a649b6cc44"},"schema_version":"1.0"},"canonical_sha256":"726a50948824ccd622b812408873b0b69477b9d372b0545bc5dd7f6a768a475c","source":{"kind":"arxiv","id":"2104.01640","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2104.01640","created_at":"2026-07-05T02:29:02Z"},{"alias_kind":"arxiv_version","alias_value":"2104.01640v1","created_at":"2026-07-05T02:29:02Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2104.01640","created_at":"2026-07-05T02:29:02Z"},{"alias_kind":"pith_short_12","alias_value":"OJVFBFEIETGN","created_at":"2026-07-05T02:29:02Z"},{"alias_kind":"pith_short_16","alias_value":"OJVFBFEIETGNMIVY","created_at":"2026-07-05T02:29:02Z"},{"alias_kind":"pith_short_8","alias_value":"OJVFBFEI","created_at":"2026-07-05T02:29:02Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2021:OJVFBFEIETGNMIVYCJAIQ45QW2","target":"record","payload":{"canonical_record":{"source":{"id":"2104.01640","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2021-04-04T16:19:31Z","cross_cats_sorted":["physics.chem-ph"],"title_canon_sha256":"d99296b8ac207f488981d141d6fdd94303a5288a4fc96f2eaf607e24eaba918b","abstract_canon_sha256":"730eb74f1a7c3bb62625788bb0d1d7e93178a3e8b7c463271ec007a649b6cc44"},"schema_version":"1.0"},"canonical_sha256":"726a50948824ccd622b812408873b0b69477b9d372b0545bc5dd7f6a768a475c","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T02:29:02.181432Z","signature_b64":"rrIQ6bPEG4cZ/ETIyokJORwWswAPJlB5cPkbyn2VApTU5WmVn/qp4A6W0v2Hdha4Rt1cNspvfM9YhLsJrspjAg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"726a50948824ccd622b812408873b0b69477b9d372b0545bc5dd7f6a768a475c","last_reissued_at":"2026-07-05T02:29:02.181069Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T02:29:02.181069Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2104.01640","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":"2026-07-05T02:29:02Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"YrXvwq6uONdPCnXfD6oFbOK5BQIvXJJUb7U+Xz7tKk+HC8BesCt7S1H/+28FtDqDrtvxWE5rJQhXBxXY6gbzDg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-13T03:28:36.958183Z"},"content_sha256":"58497d75a06de77fd7c395d204ce194ad4a193d5a83f5a5476bb0a6375b73c07","schema_version":"1.0","event_id":"sha256:58497d75a06de77fd7c395d204ce194ad4a193d5a83f5a5476bb0a6375b73c07"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2021:OJVFBFEIETGNMIVYCJAIQ45QW2","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Characterization of Nb22O54 microrods grown from niobium oxide powders recovered from mine tailings","license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","headline":"","cross_cats":["physics.chem-ph"],"primary_cat":"cond-mat.mtrl-sci","authors_text":"B. Sotillo, F. A. Lopez, L. Alcaraz, P. Fernandez","submitted_at":"2021-04-04T16:19:31Z","abstract_excerpt":"In this work, the possibility of using niobium oxide recovered from tailings from the Penouta Sn-Nb-Ta deposit (located at the North of Spain) as starting material for growing microstructures is demonstrated. The properties of the starting material have been studied to understand its crystal structure, quality and purity. Recovered niobium oxide powders are mainly of TT-Nb2O5. These powders have been used to grow Nb22O54 microrods by an evaporation method in an argon atmosphere. Different characterization techniques (X-Ray diffraction, scanning electron microscopy, micro-Raman spectroscopy, lu"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2104.01640","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/2104.01640/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":"2026-07-05T02:29:02Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"jKqI5B+GlGO6sj9B0k/LrHYIzbgBlFY1oZdC76Ufg812Jvy+EpMIpYSrb/ab7vZyo9uYdGx5Cpy0/1VF23GXBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-13T03:28:36.958608Z"},"content_sha256":"7329657cc3b34c2cda9a23def733629f3f7cff96c046551dd75c814b59fa1c4a","schema_version":"1.0","event_id":"sha256:7329657cc3b34c2cda9a23def733629f3f7cff96c046551dd75c814b59fa1c4a"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/OJVFBFEIETGNMIVYCJAIQ45QW2/bundle.json","state_url":"https://pith.science/pith/OJVFBFEIETGNMIVYCJAIQ45QW2/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/OJVFBFEIETGNMIVYCJAIQ45QW2/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":"2026-07-13T03:28:36Z","links":{"resolver":"https://pith.science/pith/OJVFBFEIETGNMIVYCJAIQ45QW2","bundle":"https://pith.science/pith/OJVFBFEIETGNMIVYCJAIQ45QW2/bundle.json","state":"https://pith.science/pith/OJVFBFEIETGNMIVYCJAIQ45QW2/state.json","well_known_bundle":"https://pith.science/.well-known/pith/OJVFBFEIETGNMIVYCJAIQ45QW2/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2021:OJVFBFEIETGNMIVYCJAIQ45QW2","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":"730eb74f1a7c3bb62625788bb0d1d7e93178a3e8b7c463271ec007a649b6cc44","cross_cats_sorted":["physics.chem-ph"],"license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2021-04-04T16:19:31Z","title_canon_sha256":"d99296b8ac207f488981d141d6fdd94303a5288a4fc96f2eaf607e24eaba918b"},"schema_version":"1.0","source":{"id":"2104.01640","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2104.01640","created_at":"2026-07-05T02:29:02Z"},{"alias_kind":"arxiv_version","alias_value":"2104.01640v1","created_at":"2026-07-05T02:29:02Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2104.01640","created_at":"2026-07-05T02:29:02Z"},{"alias_kind":"pith_short_12","alias_value":"OJVFBFEIETGN","created_at":"2026-07-05T02:29:02Z"},{"alias_kind":"pith_short_16","alias_value":"OJVFBFEIETGNMIVY","created_at":"2026-07-05T02:29:02Z"},{"alias_kind":"pith_short_8","alias_value":"OJVFBFEI","created_at":"2026-07-05T02:29:02Z"}],"graph_snapshots":[{"event_id":"sha256:7329657cc3b34c2cda9a23def733629f3f7cff96c046551dd75c814b59fa1c4a","target":"graph","created_at":"2026-07-05T02:29:02Z","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/2104.01640/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"In this work, the possibility of using niobium oxide recovered from tailings from the Penouta Sn-Nb-Ta deposit (located at the North of Spain) as starting material for growing microstructures is demonstrated. The properties of the starting material have been studied to understand its crystal structure, quality and purity. Recovered niobium oxide powders are mainly of TT-Nb2O5. These powders have been used to grow Nb22O54 microrods by an evaporation method in an argon atmosphere. Different characterization techniques (X-Ray diffraction, scanning electron microscopy, micro-Raman spectroscopy, lu","authors_text":"B. Sotillo, F. A. Lopez, L. Alcaraz, P. Fernandez","cross_cats":["physics.chem-ph"],"headline":"","license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2021-04-04T16:19:31Z","title":"Characterization of Nb22O54 microrods grown from niobium oxide powders recovered from mine tailings"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2104.01640","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":"sha256:58497d75a06de77fd7c395d204ce194ad4a193d5a83f5a5476bb0a6375b73c07","target":"record","created_at":"2026-07-05T02:29:02Z","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":"730eb74f1a7c3bb62625788bb0d1d7e93178a3e8b7c463271ec007a649b6cc44","cross_cats_sorted":["physics.chem-ph"],"license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2021-04-04T16:19:31Z","title_canon_sha256":"d99296b8ac207f488981d141d6fdd94303a5288a4fc96f2eaf607e24eaba918b"},"schema_version":"1.0","source":{"id":"2104.01640","kind":"arxiv","version":1}},"canonical_sha256":"726a50948824ccd622b812408873b0b69477b9d372b0545bc5dd7f6a768a475c","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"726a50948824ccd622b812408873b0b69477b9d372b0545bc5dd7f6a768a475c","first_computed_at":"2026-07-05T02:29:02.181069Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T02:29:02.181069Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"rrIQ6bPEG4cZ/ETIyokJORwWswAPJlB5cPkbyn2VApTU5WmVn/qp4A6W0v2Hdha4Rt1cNspvfM9YhLsJrspjAg==","signature_status":"signed_v1","signed_at":"2026-07-05T02:29:02.181432Z","signed_message":"canonical_sha256_bytes"},"source_id":"2104.01640","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:58497d75a06de77fd7c395d204ce194ad4a193d5a83f5a5476bb0a6375b73c07","sha256:7329657cc3b34c2cda9a23def733629f3f7cff96c046551dd75c814b59fa1c4a"],"state_sha256":"0c6bf22032bf22679ee3f996339fe37aa16ab5b8e11315881c010779cf09f020"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"2wTcc9WhSsalb5Zhd6SY4OPnOteusgxnf1CZda6XNAvMPfsdONCQCxnhsOUfc9oWjAFXhwz5wLJHIlBRHfAlBA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-13T03:28:36.963970Z","bundle_sha256":"6fac4f8b5b569816c0f1f0315d55ca5078aff0cc9f8782795094ede00413eb31"}}