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ChemInform Abstract: Metastable Crystallization of LaZr2F11.

✍ Scribed by S. AASLAND; S JULSRUD; T. GRANDE

Publisher
John Wiley and Sons
Year
2010
Weight
31 KB
Volume
28
Category
Article
ISSN
0931-7597

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✦ Synopsis

Metastable Crystallization of LaZr2F11. -The stable modification of the title compound, Ξ±-LaZr2F11, melts congruently at 789 Β±4 β€’ C. Quenching of the melt leads to crystallization of a metastable phase, Ξ²-LaZr2F11. Upon further cooling, this phase undergoes exothermic solid-solid phase transition to the stable Ξ±-phase. This transition is not observed during reheating of the Ξ±-phase. The melting point of the metastable . beta.-LaZr2F11 is about 10 β€’ C lower than that of the Ξ±-phase. The transition temp. is higher than the melting points of both the crystalline Ξ± and Ξ² modifications and Ξ²-LaZr2F11 is therefore metastable at all temp. but nucleates more readily from the supercoated melt than Ξ±-LaZr2F11.

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