morphotropismn.
/ˌmɔːfə(ʊ)ˈtrəʊpɪz(ə)m/, U.S. /mɔrˈfɑtrəˌpɪz(ə)m/, /ˌmɔrfəˈtrɑˌpɪz(ə)m/ Crystallography.
= morphotropy n.
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morphotropism1870
morphotropy1900
1870 Nature 23 June 156/1 This change he [sc. P. Groth] proposes to call ‘morphotropism’.
1905 Amer. Chem. Jrnl. 34 104 The chapter on Morphotropism deals with the dependence of the crystal structure on the chemical constitution of the body.
1959 J. Pouwelsen et al. tr. W. F. de Jong Gen. Crystallogr. 184 If a change of structure that occurs by replacement becomes so great that we no longer want to use the term ‘isomorphism’, we speak of morphotropism.
1966 McGraw-Hill Encycl. Sci. & Technol. (rev. ed.) VIII. 599/1 Organic compounds also show morphotropism.
1978 Acta Crystallogr. A. 34 754/1 Morphotropism has been defined as the process that, when by chemical substitution the limit of homogeneous deformation in the crystal structure is surpassed, a new atomic arrangement in space takes place.
This entry has been updated (OED Third Edition, December 2002; most recently modified version published online March 2022).
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n.1870