Title

Structure and properties of neodymium chromite

Author

David Charles Hitchcock

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 - Restricted Access

File Type

text

Language

English

Thesis Number

T 4697

Print OCLC #

7322706

Electronic OCLC #

1044758883

Link to Catalog Record

Electronic access to the full-text of this document is restricted to Missouri S&T users. Otherwise, request this publication directly from Missouri S&T Library or contact your local library.

Recommended Citation

Hitchcock, David Charles, "Structure and properties of neodymium chromite" (1981). Masters Theses. 3780.
https://scholarsmine.mst.edu/masters_theses/3780