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Phase equilibria in the system HfO[sub 2]-Y[sub 2]O[sub 3]-CaO

Journal Article · · Journal of the American Ceramic Society; (United States)
;  [1]
  1. Inst. of Materials Science Problems, 252142 Kiev, Ukraine (USSR)
This paper reports on phase equilibria in the system HfO[sub 2]-Y[sub 2]O[sub 3]-CaO which were studied in the temperature range 1250[degrees] to 2850[degrees]C by both experimental methods (X-ray phase analysis at 20[degrees] to 2000[degrees]C, petrography, annealing and quenching, differential thermal analysis in He at temperatures to 2500[degrees]C, thermal analysis in air using a solar furnace at temperatures to 3000[degrees]C, and electron microprobe X-ray analysis) and theoretical means (development of a mathematical model for the liquidus surface by means of the reduced polynomial method). Phase equilibria were determined by the structure of the restricting binary systems. No ternary compounds were found. The liquidus was characterized by the presence of six four-phase, invariant equilibria. Solid solutions were based on monoclinic (M), tetragonal (T), and cubic (F) modifications of HfO[sub 2]; C and H forms of Y[sub 2]O[sub 3]; CaO; and CaHfO[sub 3] that crystallized in two polymorphous modifications, namely, the cubic and rhombic perovskite-type structure.
OSTI ID:
7140237
Journal Information:
Journal of the American Ceramic Society; (United States), Journal Name: Journal of the American Ceramic Society; (United States) Vol. 75:11; ISSN 0002-7820; ISSN JACTAW
Country of Publication:
United States
Language:
English

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