Aug 22

Confident NTE series with per-axis expansion coefficients (COD)

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When crystals shrink on heating, they almost never shrink everywhere
Per-axis refit of all 3,264 COD multi-temperature series: axis-level contraction is ordinary (25% of all series), volumetric NTE is rare (6%), and isotropic NTE is a minority of a minority (18 of 197).

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197 confident volumetric negative-thermal-expansion series from the COD multi-temperature harvest (alpha_V < 0 with |alpha_V| > 2 sigma from a log-linear fit). Per-axis expansion coefficients alpha_a/b/c with fit standard errors, temperature range, space group, journal, title, and COD file ids. Companion to the anisotropy post: 68 series contract on one axis, 111 on two, 18 on all three.

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Rows: 197
Columns: 21
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When crystals shrink on heating, they almost never shrink everywhere
Per-axis refit of all 3,264 COD multi-temperature series: axis-level contraction is ordinary (25% of all series), volumetric NTE is rare (6%), and isotropic NTE is a minority of a minority (18 of 197).