Effects of modified-process on the microstructure, internal bias field, and activation energy in CuO-doped NKN ceramics

Song Ling Yang, Cheng Shong Hong, Cheng Che Tsai, Yi Cheng Liou, Sheng Yuan Chu

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

In this study, (Na 0.5K 0.5)NbO 3+xCuO (NKNCx, where x=0-1mol%) were separately prepared using the two-step calcination process (BO method) and a conventional mixed oxide method (MO method). The microstructure of NKNCx ceramics prepared using the MO method exhibited obviously inhomogeneous microstructure. In contrast, the BO method improved the compositional homogeneity as well as the electrical properties. A high Q m value of 2100 was obtained for NKNCx ceramics prepared using the BO method. The ceramics prepared using the BO method exhibited the formation of more oxygen vacancies, resulting in an increase in the internal bias field. The value for the activation energy of the samples supports the presence of oxygen vacancies. The bulk density, dielectric loss, k p, Q m, d 33 and e{open} 33 T/e{open} 0 of the NKNCx ceramics prepared using the BO method were 4.488g/cm 3, 0.15%, 41.5%, 2100, 95pC/N and 280, respectively.

Original languageEnglish
Pages (from-to)1643-1650
Number of pages8
JournalJournal of the European Ceramic Society
Volume32
Issue number8
DOIs
Publication statusPublished - 2012 Jul 1

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Materials Chemistry

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