Masters Theses

Abstract

"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.

Advisor(s)

Anderson, H. U. (Harlan U.)

Department(s)

Materials Science and Engineering

Degree Name

M.S. in Ceramic Engineering

Publisher

University of Missouri--Rolla

Publication Date

Spring 1981

Pagination

viii, 80 pages

Note about bibliography

Includes bibliographical references (pages 52-56).

Rights

© 1981 David Charles Hitchcock, All rights reserved.

Document Type

Thesis - Open Access

File Type

text

Language

English

Thesis Number

T 4697

Print OCLC #

7322706

Electronic OCLC #

1044758883

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