- Pseudo-binary systems CsAlF4-KAlF4 and Cs3AlF6-K3AlF6
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Phase relations in the system CsAlF4-KAlF4 and Cs3AlF6-K3AlF6 were investigated by DTA and XRD methods. In the system CsAlF4-KAlF4, two intermediate compounds 3CsAlF4·KAlF4 and CsAlF4·KAlF4 were confirmed. The first one was indexed as orthorhombic with a=9.079±0.003, b=7.958±0.002, c=7.648±0.004A?. The second one α-CsAlF4·KAlF4 is also orthorhombic, a=10.982±0.005, b=10.093±0.006, c=6.160±0.002A?. Among the two compounds and KAlF4, two eutectic temperatures e1 and e2 are formed. The first eutectic temperature e1 is located in 42mol % KAlF4 at 525°C, and e2 in 70mol % KAlF4 at 510°C. The system Cs3AlF6-K3AlF6 is a successive solid solution system with the lowest melting point, the composition of which is 75mol % Cs3AlF6 at 775°C. In the solid solution, compound 2Cs3AlF4·K3AlF6 was formed at 656°C, and was indexed as a cubic cell with a=8.891A?.
- Chen, Rong,Zhang, Qiyun
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- A study on the phase diagram of A1F3-CsF system
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Phase relations of the AlF3-CsF system have been investigated by the methods of DTA and XRD with quenching technique. Four compounds were identified: Cs3AlF6, CsAlF4, CsF·2AlF3 and CsF·3AlF3. Cs3AlF6 melts congruently at 790°C. The first eutectic, E1, between Cs3AlF6 and CsF is located in 10.0 mol% AlF3 at 654°C. CsF-2AlF3 and CsF-3AlF3 melt incongruently at 508° and 653°C, respectively. The second eutectic, E2, was observed in 42.0 mol% AlF3 at 471°C. The compound CsAlF4 formed in the solid eutectic when cooled below 443°C. CsAlF4 has α and β forms, transformation of which takes place reversibly at 422°C. All phase structures in the system were confirmed by X-ray powder diffraction analysis.
- Chen, Rong,Cao, Jie,Zhang, Qiyun
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