Preparation and phase transition of Gd4(Al1-xGax)2O9 solid solutions

H. Yamane, T. Sakamoto, S. Kubota, M. Shimada

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Abstract

The solid-solution compounds of Gd4(Al1-xGax)2O9 (x = 0.0-1.0) were prepared at 1600 °C for 5 h in air. The unit cell volume of the compounds increased from 0.853 to 0.878 nm3 with x. Phase transitions having a temperature hysteresis were observed from 1100° to 1400 °C by calorimetry and dilatometry. The transition temperature increased with x. The volume of the high-temperature phase was 0.5% smaller than that of the low-temperature phase at the transition temperature. The volume changes were independent of x. The hysteresis width observed by the dilatometry was about 300 °C for the Gd4Al2O9 ceramics (grain size: about 1 μm) and decreased to 50 °C for the Gd4(Al0.2Ga0.8)2O9 ceramics (grain size: over 10 μm). Gd4Ga2O9 was unstable at low temperature and decomposed to Gd3GaO6 and Gd3Ga5O12 during the thermal analyses.

Original languageEnglish
Pages (from-to)307-311
Number of pages5
JournalJournal of Materials Science
Volume36
Issue number2
DOIs
Publication statusPublished - 2001 Jan

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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