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Preparation and Characterization of High‐Purity HfTiO 4
Author(s) -
MAZDIYASNI K. S.,
BROWN L. M.
Publication year - 1970
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1970.tb15977.x
Subject(s) - stoichiometry , materials science , orthorhombic crystal system , analytical chemistry (journal) , microstructure , titanium , particle size , differential thermal analysis , powder diffraction , scanning electron microscope , reflection loss , diffraction , mineralogy , nuclear chemistry , metallurgy , crystallography , chemistry , crystal structure , composite number , composite material , optics , physics , chromatography
The double decomposition of hafnium and titanium tetrakis tertiary amyloxides was used to produce high‐purity stoichiometric submicron HfTiO 4 powders. The particle size range was 50 to 400 Å. X‐ray diffraction of a 1:1 mixture, as‐prepared and heated to ∼750°C, indicated that the material is 95% orthorhombic HfTiO 4 . The TGA, BET, DTA, and high‐temperature X‐ray analysis of the as‐prepared powders are also reported; the ir absorption and reflection frequencies of HfTiO 4 were determined. The homogeneity and stoichiometry of the powder were demonstrated by electron microscopy and wet chemical analysis. Mixed oxides prepared in this manner were sintered in an ambient atmosphere at 1650° to 1700°C for 4 h or Ionger into a body of nearly theoretical density and uniform microstructure.