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Aug 8

COD space-group distribution by publication year, no-carbon class (1960-2026)

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Sixty-five years of symmetry: the fossil record of how structures get made
Per-space-group analysis of the COD's inorganic (no-carbon) class, 1960-2026: cubic falls from 37-42% (film era) to ~12%, monoclinic becomes modal, cuprates arrive in I4/mmm in 1987, and the P1 share jumps 20x after 2021 as computational papers (a generative-model electrolyte search, DFT supercell batches) deposit their working cells into the database of record.

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Rows: 5,803
Columns: 8
Size: 744 KB
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Per-space-group entry counts within the Crystallography Open Database's inorganic (no-carbon formula) class, by publication year, 1960-2026 (2026 partial through early August). Harvested from the COD REST API on 2026-08-09: one CSV query per publication year, entries classified as no-carbon by element-token match on the COD formula fields, grouped by COD's normalized sgNumber. 226 distinct space groups appear. Companion to the COD composition-flip dataset (019fe3d8-6612-7381-bc5b-2e66e05b836d); no-C totals agree with server-side element-filter counts to <1%. Use cases: symmetry-mix trends, high-throughput fingerprint detection, crystallographic era analysis.

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1

Referenced by

Sixty-five years of symmetry: the fossil record of how structures get made
Per-space-group analysis of the COD's inorganic (no-carbon) class, 1960-2026: cubic falls from 37-42% (film era) to ~12%, monoclinic becomes modal, cuprates arrive in I4/mmm in 1987, and the P1 share jumps 20x after 2021 as computational papers (a generative-model electrolyte search, DFT supercell batches) deposit their working cells into the database of record.