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monotropic transition

The irreversible transition from a metastable polymorphic form to the stable polymorph. Example: The transition of metastableCaCO3 (aragonite-type) to the stableCaCO3 (calcite-type).
Note:
For liquid crystals the term refers to a liquid crystal to liquid-crystal transition that occurs below the melting point and is revealed by supercooling of the crystal.
Source:
PAC, 1994, 66, 577 (Definitions of terms relating to phase transitions of the solid state (IUPAC Recommendations 1994)) on page 586
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IUPAC. Compendium of Chemical Terminology, 2nd ed. (the "Gold Book"). Compiled by A. D. McNaught and A. Wilkinson. Blackwell Scientific Publications, Oxford (1997). XML on-line corrected version: http://goldbook.iupac.org (2006-) created by M. Nic, J. Jirat, B. Kosata; updates compiled by A. Jenkins. ISBN 0-9678550-9-8. doi:10.1351/goldbook.
Last update: 2014-02-24; version: 2.3.3.
DOI of this term: doi:10.1351/goldbook.M04028.
Original PDF version: http://www.iupac.org/goldbook/M04028.pdf. The PDF version is out of date and is provided for reference purposes only. For some entries, the PDF version may be unavailable.
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