Fabrication of PMN-PT Single Crystals by Using the Exaggerated Grain Growth Method

Abstract

Polycrystalline 65 mole% Pb(Mg1/3Nb1/3)O3 -35 mole% PbTiO3 (PMN-PT) specimens were prepared by conventional and spark-plasma sintering. Conventional sintering at 1200 deg C produced 92% dense specimens, whereas spark-plasma sintering at 900 deg C produced 99% dense specimens. Addition of slight excesses of Mg accelerated grain growth, but additions of Nb retarded grain growth. In addition, excess Mg decreased dielectric and piezoelectric properties. Grain-growth studies indicated that abnormal grain growth (AGG) occurred when excess Pb was present. The AGG was ascribed to formation of sum 3 coincidence-site-lattice and low-angle grain boundaries. Because of reentrant edges appearing at the ends of these boundaries, grain-coarsening rates were significantly enhanced. However, single crystals could not be made by an AGG process.

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Document Details

Document Type
Technical Report
Publication Date
Nov 23, 2001
Accession Number
ADA398431

Entities

People

  • D. Y. Yoon
  • Doh-yeon Kim
  • Ho-yong Lee
  • N. M. Hwang
  • S. J. Kang

Organizations

  • Seoul National University

Tags

Communities of Interest

  • Advanced Electronics
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Ceramic Materials
  • Crystal Structure
  • Crystals
  • Fabrication
  • Grain Boundaries
  • Grain Growth
  • Heat Energy
  • Heat Treatment
  • Low Angles
  • Materials
  • Materials Engineering
  • Materials Processing
  • Materials Science
  • Phase Transformations
  • Polycrystals
  • Single Crystals
  • Two Dimensional

Fields of Study

  • Materials science

Readers

  • Materials Science and Engineering.
  • Powder metallurgy of Titanium alloys.