dilational transition (dilatational transition)

https://doi.org/10.1351/goldbook.D01733
A transition in which the crystal structure is dilated (or compressed) along one (or more) crystallographic direction(s) while the symmetry about that direction is retained. Examples:
  1. The transition of a CsCl-type structure to a rock salt structure in which dilation occurs along the three-fold axis.
  2. The transition at TD in quenched NiS in which volume expansion occurs without change of symmetry on going from a metallic state (T>TD) to a semiconducting state (T<TD).
Source:
PAC, 1994, 66, 577. (Definitions of terms relating to phase transitions of the solid state (IUPAC Recommendations 1994)) on page 581 [Terms] [Paper]
Citation: 'dilational transition' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. https://doi.org/10.1351/goldbook.D01733 RIS BibTex EndNote
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Last revised: February 24, 2014