HIGH-TEMPERATURE X-RAY STUDY OF THE STRUCTURE AND PROPERTIES OF SOLID SOLUTIONS BASED ON ZIRCONIUM AND HAFNIUM DIOXIDES.

A study of the structures, melting temperatures, temperatures of the phase changes, and the linear thermal expansion coefficients alpha //t of solid solutions based on zirconium and hafnium dioxides from the point of view of material science but opens up practical possibilities of using these materials as secondary reference points. The authors describe a system of programmed heating and automatic control of the temperature of the specimen in the working zone of an electric resistance furnace. The structure, polymorphism, alpha //t, the unit cell, and melting temperature of solid solutions in the Dy//2O//3 multiplied by (times) 2ZrO//2-Dy//2O//3 multiplied by (times) 2HfO//2, ZrO//2-HfO//2-CeO//2 systems (zirconates of rare-earth elements) were studied.