Subsolidus Phase Relationships in the Ga ₂ O ₃ –Al ₂ O ₃ –TiO ₂ System

Abstract

Subsolidus phase relationships in the Ga 2 O 3 –Al 2 O 3 –TiO 2 system at 1400°C were studied using X‐ray diffraction. Phases present in the pseudoternary system include TiO 2 (rutile), Ga 2−2 x Al 2 x O 3 ( x ≤0.78 β‐gallia structure), Al 2−2 y Ga 2 y O 3 ( y ≤0.12 corundum structure), Ga 2−2 x Al 2 x TiO 5 (0≤ x ≤1 pseudobrookite structure), and several β‐gallia rutile intergrowths that can be expressed as Ga 4−4 x Al 4 x Ti n −4 O 2 n −2 ( x ≤0.3, 15≤ n ≤33). This study showed no evidence to confirm that aluminum substitution of gallium stabilizes the n =7 β‐gallia–rutile intergrowth as has been mentioned in previous work.