Affordable Access

Publisher Website

Effects of Na/K evaporation on electrical properties and intrinsic defects in Na0.5K0.5NbO3ceramics

Authors
Journal
Materials Chemistry and Physics
0254-0584
Publisher
Elsevier
Publication Date
Volume
117
Issue
1
Identifiers
DOI: 10.1016/j.matchemphys.2009.05.024
Keywords
  • Ceramics
  • Evaporation
  • Defects
  • Dielectric Properties

Abstract

Abstract The intrinsic defects of (Na 0.5K 0.5)NbO 3 (NKN) ceramics fabricated by high-energy ball-milling have been studied. In order to obtain the different amounts of Na/K evaporation, NKN ceramics were sintered in air (NKN exposed samples) and in calcined NKN powder (NKN buried samples), respectively. Compared with the dielectric and piezoelectric properties of the buried samples, the exposed samples exhibited a donor doped behavior at room temperature. A dielectric relaxation, induced by intrinsic oxygen vacancies, was detected in paraelectric phase region. The activity energies of intrinsic oxygen vacancies are 1.04 eV and 1.47 eV for the exposed samples and buried samples, respectively. The difference of activity energies resulted from singly ionized oxygen vacancies translating into doubly ionized oxygen vacancies with the increase of Na/K evaporation.

There are no comments yet on this publication. Be the first to share your thoughts.