HfO2-based refractory compounds and solid solutions

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This paper is a review of works performed mainly in the USSR. The purpose of many of these works was the finding of new refractory compounds which could create the basis of high-refractory materials. The objects of the investigations were hafnium dioxide (HfO 2 ) and oxides of alkali-earth and rare-earth elements. The phase diagrams for the systems HfO 2 Ln 2 O 3 and HfO 2 MO are given as well as the structures of the compounds and solid solutions formed in the systems.