Pseudocubic-based polymorphic phase boundary structures and their effect on the piezoelectric properties of (Li,Na,K)(Nb,Sb)O3-SrZrO3 lead-free ceramics

Ku Tak Lee, Dae Hyeon Kim, Sung Hoon Cho, Jeong Seog Kim, Jungho Ryu, Chel Woo Ahn, Tae Ho Lee, Gyeung Ho Kim, Sahn Nahm

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

CuO-added 0.96(LixNa0.5-xK0.5)(Nb1-ySby)O3-0.04SrZrO3 ceramics were sintered at 1020 °C for 6 h. Various crystal structures were synthesized in these specimens by controlling the Li2CO3 (x) and Sb2O5 (y) contents: pseudocubic, orthorhombic-pseudocubic polymorphic phase boundary (PPB), tetragonal-pseudocubic PPB, orthorhombic-tetragonal-pseudocubic PPB, and orthorhombic-tetragonal PPB structures. The pseudocubic structure developed in these specimens was similar to the R3m rhombohedral structure instead of the Pm3m cubic structure because the specimens with a pure pseudocubic structure showed good ferroelectric and piezoelectric properties. The piezoelectric properties of the specimens were influenced by their crystal structures. The specimen with the tetragonal-pseudocubic PPB structure showed the best piezoelectric properties because this structure was similar to the tetragonal-rhombohedral morphotropic phase boundary structure developed in Pb(Zr1-xTix)O3-based ceramics. In particular, the specimen with the tetragonal-pseudocubic PPB structure corresponding to x = 0.05 and y = 0.065 showed the largest d33 and kp values of 431 pC/N and 0.43, respectively.

Original languageEnglish
Pages (from-to)1334-1343
Number of pages10
JournalJournal of Alloys and Compounds
Volume784
DOIs
Publication statusPublished - 2019 May 5

Keywords

  • (Li,Na,K)(Nb,Sb)O-SrZrO-based lead free piezoelectric ceramics
  • Piezoelectric properties
  • Polymorphic phase boundary structure
  • Pseudocubic structure

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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