PHASE FORMATION IN THE ZrO_ - HfO_- Gd_O_ ND ZrO_ - HfO_2 - Yb_2O_3 SYSTEMS

摘要

The formation of phases and properties of solid solutions and Gd_2Zr_2O_7 and Yb_4Zr_3O_(12) chemical compounds in the ZrO_2 - Gd_2O_3 and ZrO_2 - Yb_2O_3 systems are studied. The compounds undergo a phase transformation of the type "order - disorder" and melt incongruently. The data on the parameters of the elementary cells, the melting temperatures, and the TCLE of phases in the ZrO_2 - Gd_2O_3 and ZrO_2 - Yb_2O_3 systems are presented. These data are compared with similar data for phases based on HfO_2. The considered solid solutions are shown to be promising for the production of high-temperature, heat-insulating ceramics for growing single crystals.