The phase relations in the In 2O 3A 2O 3BO systems at elevated temperatures [ A: Fe or Ga, B: Cu or Co

Abstract

The phase relations in the In 2O 3Fe 2O 3CuO system at 1000°C, the In 2O 3Ga 2O 3CuO system at 1000°C, the In 2O 3Fe 2O 3CoO system at 1300°C, and the In 2O 3Ga 2O 3CoO system at 1300°C were determined by means of a classical quenching method. InFeCuO 4 ( a = 3.3743(4) Å, c = 24.841(5) Å), InGaCuO 4 ( a = 3.3497(2) Å, c = 24.822(3) Å), and InGaCoO 4 ( a = 3.3091(2) Å, c = 25.859(4) Å) having the YbFe 2O 4 crystal structure, In 2Fe 2CuO 7 ( a = 3.3515(2) Å, c = 28.871(3) Å), In 2Ga 2CuO 7 ( a = 3.3319(1) Å, c = 28.697(2) Å), and In 2FeGaCuO 7 ( a = 3.3421(2) Å, c = 28.817(3) Å) having the Yb 2Fe 3O 7 crystal structure, and In 3Fe 3CuO 10 ( a = 3.3432(3) Å, c = 61.806(6) Å) having the Yb 3Fe 4O 10 crystal structure were found as the stable ternary phases. There is a continuous series of solid solutions between InFeCoO 4 and Fe 2CoO 4 which have the spinel structure at 1300°C. The crystal chemical roles of Fe 3+ and Ga 3+ in the present ternary systems were qualitatively compared.