@prefix this: . @prefix sub: . @prefix np: . @prefix rdf: . @prefix prov: . @prefix npx: . @prefix dc: . @prefix xsd: . sub:Head { this: a np:Nanopublication; np:hasAssertion sub:assertion; np:hasProvenance sub:provenance; np:hasPublicationInfo sub:pubinfo . } sub:assertion { a ; dc:description "Symmetry expansion of the first COD diamond CIF (by id) in Fd-3m that yields 8 full-occupancy carbons per cell; neighbours within 1.1 times the shortest C-C distance counted and bond angles computed in a 3x3x3 block."; "Measured: 0 largest deviation of a C-C-C bond angle from 109.47 degrees in the refined diamond structure (degrees) (n = 48). Interpretation: The geometry follows exactly from the space group and the Wyckoff position 8a, so a refined structure in Fd-3m with carbon on 8a passes by construction; the empirical content is that diamond refines in that space group with that site, which is what the CIF records. A single structure is enough for the geometry; the number of independent CIFs found is reported."; "Claim test of bragg1915-03: supports, confidence 0.95"; ; prov:wasAttributedTo ; "Planned datasets: cod-search-api"; "claim-test/0.1.0"; "physical"; "Coordination number other than 4, or any angle off by more than 1 degree: refutes. Angles between 0.1 and 1 degree off: mixed. No ambient Fd-3m diamond CIF with coordinates in the COD: inconclusive."; "Deviation: COD writes the space group with an origin-choice suffix ('F d -3 m :1' or ':2'); the suffix is stripped before matching the pre-registered symbol.", "Deviation: Entries whose CIF does not expand to 8 full-occupancy carbon positions (the pre-registered Z = 8) are skipped and listed in results.skipped_entries; the first remaining entry by COD id is used.", "Passes by construction for any structure refined in Fd-3m with carbon on 8a; the empirical content is that diamond refines there.", "Two CIFs were skipped (one with partial occupancy at a displaced site, one with no parseable coordinates) and are listed in results.skipped_entries."; "From the atomic coordinates of a COD diamond CIF (formula C, space group F d -3 m, Z = 8, ambient), expanding symmetry to a 3x3x3 block: every carbon has exactly 4 neighbours within 1.1 times the shortest C-C distance, that distance equals a sqrt(3)/4 within 0.1 per cent, and every bond angle is within 0.1 degree of 109.47: supports."; "Coordination number other than 4, or any angle off by more than 1 degree: refutes. Angles between 0.1 and 1 degree off: mixed. No ambient Fd-3m diamond CIF with coordinates in the COD: inconclusive."; "0.95"^^xsd:double; ; "supports"; "If diamond's carbon atoms lie on two interpenetrating face-centred cubic lattices with tetrahedral coordination, a refined diamond structure gives every carbon exactly four nearest neighbours at a sqrt(3)/4 with all six bond angles 109.47 degrees."; "Symmetry expansion of the first COD diamond CIF (by id) in Fd-3m that yields 8 full-occupancy carbons per cell; neighbours within 1.1 times the shortest C-C distance counted and bond angles computed in a 3x3x3 block."; "From the atomic coordinates of a COD diamond CIF (formula C, space group F d -3 m, Z = 8, ambient), expanding symmetry to a 3x3x3 block: every carbon has exactly 4 neighbours within 1.1 times the shortest C-C distance, that distance equals a sqrt(3)/4 within 0.1 per cent, and every bond angle is within 0.1 degree of 109.47: supports."; "true"^^xsd:boolean . . a ; dc:description ""; dc:license "CC0 (COD data are public domain)"; "Dataset: Crystallography Open Database (COD) search API and CIF files"; prov:atLocation , ; prov:wasDerivedFrom ; "sha256:8a3cd9baa420d634b1aa242c843e45510abdacedd16d607d1f956db997b2ef99", "sha256:8ac7ddff65131f7f940a5d94f598f93012a152495b3f154b4c9ed536412af8ea" . } sub:provenance { a prov:SoftwareAgent; "delphisci claim tester (claude-fable-5.1; crystals-and-form-tests-1)"; prov:actedOnBehalfOf ; . a ; dc:identifier "claude-fable-5.1" . sub:assertion prov:wasAttributedTo ; prov:wasDerivedFrom ; prov:wasGeneratedBy sub:test . sub:plan prov:hadPlan . sub:test a prov:Activity; prov:qualifiedAssociation sub:plan; prov:wasAssociatedWith . } sub:pubinfo { this: dc:created "2026-11-08T16:24:31.804Z"^^xsd:dateTime; dc:creator ; dc:license ; npx:hasNanopubType ; npx:introduces ; "Claim test of bragg1915-03: supports, confidence 0.95"; . sub:sig npx:hasAlgorithm "RSA"; npx:hasPublicKey "MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAyFHtPB6p0mCjDozxlOY9CmO3nBm7Te3jFbXyLmM+G1tGe47Da0jYIbhkl9Oo1ZjxmCa3LCwlEqK8gj6hEIcL4ahW30JXh9HycfKVk1bugkzMEV15tJdTzAU3sGMFnbNsn43xY2LFLy45tApkRm5byEiM7oRRrooIdwoQKnP4Wzq/bfAoJ9qvW+MGkelyOTd1jbSt+KfmT7xKmDfWzAHddUlWwMX2QJOLxDaffOteTop6ZRgPiNmPJKA/S62Gac9XtSYT3oDkZ6/nr5cxxNLpOyxTf5FPISiCe11xYO/unYjY+mwnOfA8yhJIyx1l0O9I0vpOpn+E5TvyHJV+oSTrvwIDAQAB"; npx:hasSignature "dyYQqN9lkUe/YLaVfbimM6yOlUtaafjTjKh9Bws5lnHX1VSNapt8Ez6ZO4JqbqtLyntvap8t4ziZl0Iei7yYaESYjNcOLljW7TrFGrDH3h8PTwi/KZYi0N7BOuxHXMri+N+sNcSTz+gB+Yi3Z8x7TcVDrRZK+8QKdmkaDl/5MWE7jFqvFyd/893sfp7OY8d1m7+z0TjEXDRYHNje6iNuvrJFj4Uwl+JXpzLy6t4VNrPAH2HVcRK41ZUwjFabySoDZ++z/P8L3fsQmJSPmtb2yCw0h+dUrvjnCVNRRb0u60GUx7FDOHPkP718yEEoIcXrrB2MHfZjFEPFb6K62U33iQ=="; npx:hasSignatureTarget this:; npx:signedBy . }