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Phase Transitions in Some Langbeinite-Type Crystals

✍ Scribed by Hikita, Tomoyuki; Sato, Saburo; Sekiguchi, Hiroshi; Ikeda, Takuro

Book ID
127077043
Publisher
Institute of Pure and Applied Physics
Year
1977
Tongue
English
Weight
562 KB
Volume
42
Category
Article
ISSN
0031-9015

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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