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Title: Phase relations and thermal expansion in the system HfO/sub 2/--TiO/sub 2/

Abstract

The system HfO/sub 2/-TiO/sub 2/ was investigated in the 0 to 60 mol percent TiO/sub 2/ region using x-ray diffraction analysis, differential thermal analysis, melting-point studies, and dilatometry. For samples quenched from 1500 and 1250/sup 0/C, single-phase HfTiO/sub 4/ is present from approximately 36 to 53 percent TiO/sub 2/, with HfO/sub 2/ coexisting as a second phase below 36 percent TiO/sub 2/ and TiO/sub 2/ coexisting as a second phase above 53 percent TiO/sub 2/. Room-temperature lattice parameters of the hafnium titanate phase decreased linearly with composition for samples quenched from 1500/sup 0/C and furnace-cooled from 1600/sup 0/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 coefficients (less than 1 x 10/sup -6///sup 0/C) for compositions in the 30 to 40 percent TiO/sub 2/ range and relatively high coefficients (approximately 4 x 10/sup -6///sup 0/C) for the 25, 45, 50, and 60 mol percent TiO/sub 2/ compositions. The low expansion was attributed to microcracking. 5 fig.

Authors:
 [1]; ; ;
  1. Wright-Patterson Air Force Base, OH
Publication Date:
OSTI Identifier:
7317792
Resource Type:
Journal Article
Journal Name:
J. Am. Ceram. Soc.; (United States)
Additional Journal Information:
Journal Volume: 59:11-12
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; HAFNIUM OXIDES; PHASE DIAGRAMS; THERMAL EXPANSION; TITANIUM OXIDES; ANISOTROPY; CHEMICAL COMPOSITION; LATTICE PARAMETERS; CHALCOGENIDES; DIAGRAMS; EXPANSION; HAFNIUM COMPOUNDS; OXIDES; OXYGEN COMPOUNDS; TITANIUM COMPOUNDS; TRANSITION ELEMENT COMPOUNDS; 360202* - Ceramics, Cermets, & Refractories- Structure & Phase Studies

Citation Formats

Ruh, R, Hollenberg, G W, Charles, E G, and Patel, V A. Phase relations and thermal expansion in the system HfO/sub 2/--TiO/sub 2/. United States: N. p., 1976. Web. doi:10.1111/j.1151-2916.1976.tb09416.x.
Ruh, R, Hollenberg, G W, Charles, E G, & Patel, V A. Phase relations and thermal expansion in the system HfO/sub 2/--TiO/sub 2/. United States. doi:10.1111/j.1151-2916.1976.tb09416.x.
Ruh, R, Hollenberg, G W, Charles, E G, and Patel, V A. Thu . "Phase relations and thermal expansion in the system HfO/sub 2/--TiO/sub 2/". United States. doi:10.1111/j.1151-2916.1976.tb09416.x.
@article{osti_7317792,
title = {Phase relations and thermal expansion in the system HfO/sub 2/--TiO/sub 2/},
author = {Ruh, R and Hollenberg, G W and Charles, E G and Patel, V A},
abstractNote = {The system HfO/sub 2/-TiO/sub 2/ was investigated in the 0 to 60 mol percent TiO/sub 2/ region using x-ray diffraction analysis, differential thermal analysis, melting-point studies, and dilatometry. For samples quenched from 1500 and 1250/sup 0/C, single-phase HfTiO/sub 4/ is present from approximately 36 to 53 percent TiO/sub 2/, with HfO/sub 2/ coexisting as a second phase below 36 percent TiO/sub 2/ and TiO/sub 2/ coexisting as a second phase above 53 percent TiO/sub 2/. Room-temperature lattice parameters of the hafnium titanate phase decreased linearly with composition for samples quenched from 1500/sup 0/C and furnace-cooled from 1600/sup 0/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 coefficients (less than 1 x 10/sup -6///sup 0/C) for compositions in the 30 to 40 percent TiO/sub 2/ range and relatively high coefficients (approximately 4 x 10/sup -6///sup 0/C) for the 25, 45, 50, and 60 mol percent TiO/sub 2/ compositions. The low expansion was attributed to microcracking. 5 fig.},
doi = {10.1111/j.1151-2916.1976.tb09416.x},
journal = {J. Am. Ceram. Soc.; (United States)},
number = ,
volume = 59:11-12,
place = {United States},
year = {1976},
month = {1}
}