14484-69-6Relevant articles and documents
A calorimetric investigation of polymorphism in a layered perovskite: KAlF4
White, M. A.,Wagner, B. D.
, p. 519 - 526 (1986)
The heat capacity from 15 to 365 K of the layered perovskite KAlF4 is reported.On warming, a large thermal anomaly is observed at about 340 K, and the thermal history of the sample was found to have a major effect on the temperature, enthalpy, and complexity of the phase transition.D.s.c. results indicate that the phase transition on warming at 340 K is the high-temperature counterpart of the transition that had been previously reported at 250 K on cooling, and that the 250 K transformation is the stable transition.No further phase transitions are found in KAlF4 in the temperature region from 15 to 365 K.
Investigation of the systems KAlF4-KBe2F5 and K3AlF6-KBe2F5
Chen,Cao,Zhang
, p. 161 - 164 (2000)
Phase relations in the systems KA1F4-KBe2F5 and K3A1F6-KBe2F5 have been investigated by DTA and XRD methods. The KA1F4-KBe2F5 is a simple eutectic system with the eutectic point at a composition of 80.0 mol% KBe2F5 at 335 °C. For the later system, two incongruent compounds 2K3A1F6·KBe2F5 and K3A1F6·KBe2F5 melting at 448 and 378 °C, respectively were confirmed. They have been XRD indexed as both orthorhombic cells with cell parameters a = 10.70±0.01, b = 10.36±0.01, c = 5.85±0.02 A? for the former and a = 10.499±0.003, b = 9.685±0.005, c = 7.554±0.005 A? for the later. One eutectic point located at 85.0 mol% KBe2F5 at 336 °C was also observed. (C) 2000 Elsevier Science B.V.
Bail, A. Le,Duroy, H.,Fourquet, J. L.
, p. 151 - 158 (1992)