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.
Cet appareillage a été réalisé dans le but d'étudier la viscosité des liquides aux très hautes pressions dans le domaine de température situé au-dessous de 30 °C. Il utilise le principe du viscosimètre de Hoppler à bille roulante. La mesure du temps de chute de la bille se fait par détection de variation de l'inductance de bobines placées en deux points de sa trajectoire. Des résultats ont été ainsi obtenus pour la viscosité du glycérol à la température de 20 °C et jusqu'à 6 000 bars
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