Structure evolution and phase development of NKN-BNT piezoelectric ceramics

Huiqing Fan, Laijun Liu

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

Na0.5K0.5NbO3 (NKN) and Bi 0.5Na0.5TiO3 (BNT) are the most potential candidates of lead-base piezoelectric materials. The microstructure and phase transition behavior as well as dielectric and piezoelectric properties of NKN-BNT solid solution fabricated by mechanical alloying method were investigated. Nanopowder (∼35 nm) could be obtained after calcining at a relative low temperature. A coexistence region of tetragonal and orthorhombic was found in pure NKN, and the region shifted to low temperature ranges with the introduction of impurities or the second phase. The crystal structure and microstructure of NKN-BNT solid solution changed dramatically with the increaseing of BNT, and all phase transition temperatures deduced. The coexistence region shifted to room temperature while the amount of BNT is at 6 mol %. The morphotropic phase boundary (MPB) as well as the polymorphism behavior (PPB) of NKN-BNT solid solution is discussed in detail.

Original languageEnglish
Title of host publication2nd International Conference on Smart Materials and Nanotechnology in Engineering
DOIs
StatePublished - 2009
Event2nd International Conference on Smart Materials and Nanotechnology in Engineering - Weihai, China
Duration: 8 Jul 200911 Jul 2009

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume7493
ISSN (Print)0277-786X

Conference

Conference2nd International Conference on Smart Materials and Nanotechnology in Engineering
Country/TerritoryChina
CityWeihai
Period8/07/0911/07/09

Keywords

  • Morphotropic phase boundary
  • Nano-powders
  • NKN-BNT ceramics
  • Piezoelectrics
  • Polymorphism behavior

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