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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
Solans, Xavier, 1949-2007; González-Silgo, C.; Calvet Pallàs, Maria Teresa; Ruiz-Pérez, C.; Martínez Sarrión, María Luisa; Mestres i Vila, Ma. Lourdes
Universitat de Barcelona
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.
2010-05-05
Difracció
Ferroelectricitat
Dielèctrics
Diffraction
Ferroelectricity
Dielectrics
(c) The American Physical Society, 1998
Article
The American Physical Society
         

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Solans, Xavier, 1949-2007; González-Silgo, C.; Calvet Pallàs, Maria Teresa; Ruiz-Pérez, C.; Martínez Sarrión, María Luisa; Mestres i Vila, Ma. Lourdes
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