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.
Wetting improvement of carbon or silicon carbide by aluminum alloys based on a K2ZrF6 surface treatment: application to composite material casting
Rocher,Quenisset,Naslain
, p. 2697 - 2703 (1989)
A surface treatment with aqueous solutions of K2ZrF6 has been carried out to improve the wetting of carbon (or SiC)-base ceramics by liquid light alloys at low temperatures (i.e., within the 700 to 900°C range). The mechanism which i
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.
Production of Al-B alloy by heating Al/KBF4 powder blends
Birol, Yucel
, p. 195 - 198 (2009)
Al-B master alloys have received considerable attention in recent years owing to their potential as efficient grain refiners for aluminium foundry alloys. While they are generally produced via the halide salt route in bulk alloy form, their use in the for
(Oxo)(Fluoro)-Aluminates in KF-Al2O3 System: Thermal Stability and Structural Correlation
?imko, Franti?ek,Rakhmatullin, Aydar,Florian, Pierre,Kontrík, Martin,Korenko, Michal,Netriová, Zuzana,Danielik, Vladimír,Bessada, Catherine
, p. 13349 - 13359 (2017/11/15)
Precise investigation of part of the phase diagram of KF-Al2O3 system was performed in an experiment combining different techniques. Solidified mixtures of KF-Al2O3 were studied by X-ray powder diffraction and high-field solid-state NMR spectroscopy over a wide range of compositions. To help with the interpretation of the NMR spectra of the solidified samples found as complex admixtures, we synthesized the following pure compounds: KAlO2, K2Al22O34, α-K3AlF6, KAlF4, and K2Al2O3F2. These compounds were then characterized using various solid-state NMR techniques, including MQ-MAS and D-HMQC. NMR parameters of the pure compounds were finally determined using first-principles density functional theory calculations. The phase diagram of KF-Al2O3 with the alumina content up to 30 mol % was determined by means of thermal analysis. Thermal analysis was also used for the description of the thermal stability of one synthesized compound, K2Al2O3F2.
