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enantiotropy Physical Chem.|ɛˌnæntɪˈɒtrəpɪ|
[ad. G. enantiotropie (O. Lehmann Molekularphysik (1888) I. 119), f. Gr. ἐναντίο-ς opposite + τροπή turning.]
The existence of two stable polymorphs of a substance which at a certain transition temperature are interconvertible. Hence enantioˈtropic a.
1900Jrnl. Chem. Soc. LXXVIII. ii. 83 Enantiotropy of Tin. 1903H. C. Jones Princ. Inorg. Chem. 172 Substances which like sulphur exist in two phases of the same state of aggregation, and the two phases can be reciprocally transformed into one another by changing the temperature, are known as enantiotropic. 1904A. Findlay Phase Rule 42. 1937 Nature 31 July 202/2 Barium carbonate shows an enantiotropic change at 800° from the rhombic to the hexagonal form. 1948Glasstone Physical Chem. (ed. 2) vi. 469 Two crystalline forms of a substance are said to be enantiotropic, or to exhibit enantiotrophy, when each has a definite range of stability, and the change from one form to the other takes place at a definite temperature in either direction. |