"Pure, accepton and Al doped NdCrO3 were prepared by an organo-metallic process.
The crystal structure and lattice parameters were determined by x-ray diffraction. All compositions were orthorhombic Pbnm.
Pellets were pressed from powders of each composition and sintered to high density in a reducing atmosphere. When a small amount of Fe was substituted for Cr, the powder could be sintered in air.
Electrical conductivity for acceptor doped NdCrO3 varied from about 1 (ohm cm)-1 at room temperature to about 10 (ohm cm)-1 at 900°C, about two orders of magnitude higher than the electrical conductivity of the undoped NdCrO3. The activation energy for conduction was lowered by acceptor doping (from 0.18 to 0.08 ev).
The thermal expansion coefficient of NdCrO3 was 7.5 x 10-6/°C. Doped and Al substituted material had higher thermal expansion coefficients, with no crystallographic transitions being observed in any composition with thermal expansion measurements to 900°C"--Abstract, page ii.
Anderson, H. U. (Harlan U.)
Materials Science and Engineering
M.S. in Ceramic Engineering
University of Missouri--Rolla
viii, 80 pages
© 1981 David Charles Hitchcock, All rights reserved.
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Hitchcock, David Charles, "Structure and properties of neodymium chromite" (1981). Masters Theses. 3780.
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