MECHANICAL CHARACTERISTICS OF POLYCRYSTALLINE NIO.

Abstract

Nickel oxide powder of 99.99% purity has been prepared by repeated recrystallization of hydrated nickelous sulphate and subsequent thermal decomposition. The electrical conductivity of polycrystalline nickel oxide was shown to be a function of the 1/6 power of the oxygen pressure at temperatures in excess of 700 C. The modulus of elasticity of nickel oxide was shown to be significantly reduced by heat treatment in oxygen. The modulus of elasticity on nickel oxide was shown to increase anomalously with temperature at temperatures below its Neel temperature (250 C). Polycrystalline nickel oxide deformed in an essentially elastic and brittle manner in mechanical tests at 1000 C. (Author)

Document Details

Document Type
Technical Report
Publication Date
Sep 01, 1963
Accession Number
AD0423663

Entities

People

  • A. L. Friedberg
  • R. J. Herbst

Organizations

  • University of Illinois Urbana–Champaign

Tags

DTIC Thesaurus Topics

  • Conductivity
  • Decomposition
  • Elastic Properties
  • Electrical Conductivity
  • Heat Energy
  • Heat Treatment
  • Modulus Of Elasticity
  • Neel Temperature
  • Physical Properties
  • Polycrystals
  • Recrystallization
  • Transition Temperature

Fields of Study

  • Materials science

Readers

  • Materials Science and Engineering.
  • Mechanical Engineering/Mechanics of Materials.
  • Thermal Physics or Thermal Science.