Abstract
The thermal stability of the hydrate-like , in which denotes the trivalent elements Ga, Sc, Lu, and Y, was studied. When brownmillerite and its related type were cooled from to room temperature in a thermogravimetry-differential thermal analysis (TG-DTA) apparatus under a wet atmosphere, the exothermal peak in DTA accompanying an abrupt mass increase attributable to the formation of hydrate-like was observed; the mass increase occurred in the temperature range of . For , Lu, and Y, the value of equaled 1, and the structure was the same as that of . For , the hydrate-like compound of appeared. The phase transformation temperature from that of into that of for , Lu, and Y was higher than that for the unsubstituted , while it was lower for than for . The increase in thermal stability by of with , Lu, and Y was discussed in terms of the higher affinity for the hydroxyl group of the basic Sc, Lu, and Y than that of amphoteric In and Ga.
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