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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
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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.
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SOLANS, Xavier, GONZÁLEZ-SILGO, Cristina, CALVET PALLÀS, Maria teresa, RUIZ-PÉREZ, C., MARTÍNEZ SARRIÓN, María luisa, MESTRES I VILA, Ma. lourdes. 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. _Physical Review B_. 1998. Vol. 57, núm. 9, pàgs. 5122-5125. [consulta: 23 de gener de 2026]. ISSN: 0163-1829. [Disponible a: https://hdl.handle.net/2445/10637]