2026-04-04T01:22:05Zhttps://recercat.cat/oai/requestoai:recercat.cat:2445/106372025-12-05T00:50:54Zcom_2072_1057col_2072_478917col_2072_478923col_2072_478933
RECERCAT
author
Solans, Xavier, 1949-2007
author
González-Silgo, Cristina
author
Calvet Pallàs, Maria Teresa
author
Ruiz-Pérez, C.
author
Martínez Sarrión, María Luisa
author
Mestres i Vila, Ma. Lourdes
2009-12-29T11:01:23Z2009-12-29T11:01:23Z1998
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.
(c) The American Physical Society, 1998 info:eu-repo/semantics/openAccess
Difracció
Ferroelectricitat
Dielèctrics
Diffraction
Ferroelectricity
Dielectrics
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
info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion