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Structural Phase Transitions in KFeF4 and Related Materials

✍ Scribed by Saint-Grégoire, P. ;Almairac, R. ;Lapasset, J. ;Moret, J.


Publisher
John Wiley and Sons
Year
1990
Tongue
English
Weight
230 KB
Volume
120
Category
Article
ISSN
0031-8965

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Structural Phase Transitions in Langbein
✍ V. Dvořák 📂 Article 📅 1972 🏛 John Wiley and Sons 🌐 English ⚖ 373 KB

Using Landau theory of phase transitions it is shown that in the langbeinite structure (space group T4) four spatially homogeneous structural phase transitions are possible. 'Three of them are improper ferroelectric and result from a phonon instability at the M point of the Brillouin zone. The fourt