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Title: X-ray diffraction, thermal analysis, and Raman scattering study of K2BeF4 and comparation to other member of the (beta)-K2SO4 family with ferroelectric -paraelectric transition
Author: Solans, Xavier, 1949-2007
González-Silgo, C.
Calvet Pallàs, Maria Teresa
Ruiz-Pérez, C.
Martínez Sarrión, María Luisa
Mestres i Vila, Ma. Lourdes
Keywords: Difracció
Issue Date: 1998
Publisher: The American Physical Society
Abstract: Thermal analysis, powder diffraction, and Raman scattering as a function of the temperature were carried out on K2BeF4. Moreover, the crystal structure was determined at 293 K from powder diffraction. The compound shows a transition from Pna21 to Pnam space group at 921 K with a transition enthalpy of 5 kJ/mol. The transition is assumed to be first order because the compound shows metastability. Structurally and spectroscopically the transition is similar to those observed in (NH4)2SO4, which suggests that the low-temperature phase is ferroelectric. In order to confirm it, the spontaneous polarization has been computed using an ionic model.
Note: Reproducció digital del document publicat en format paper, proporcionada per PROLA i
It is part of: Physical Review B, 1998, vol. 57, núm. 9, p. 5122-5125
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ISSN: 0163-1829
Appears in Collections:Articles publicats en revistes (Mineralogia, Petrologia i Geologia Aplicada)
Articles publicats en revistes (Química Inorgànica i Orgànica)

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