The system HfO,-TiO, was investigated in the 0 to 60 mol% TiO, region using X-ray diffraction analysis, differential thermal analysis, melting-point studies, and dilatometry. For samples quenched from 1500" and 1250"C, single-phase HfTiOl is present from = 36 to 53% TiO,, with HfO, coexisting as a second phase below 36% TiO, and TiO, coexisting as a second phase above 53% TiO,. Room-temperature lattice parameters of the hafnium titanate phase decreased linearly with composition for samples quenched from 1500°C and furnace-cooled from 1600°C. High-temperature lattice parameter studies confirmed the expansion anisotropy of the hafnium titanate phase in the single-phase region. Linear thermal-expansion measurements revealed very low coeficients (< 1 x 10-6/"C) for compositions in the 30 to 40% Ti@ range and relatively high coefficients ( = 4 X 10-6/"C) for the 25, 45, 50, and 60 mol% TiO, compositions. The low expansion was attributed to microcracking.
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