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Structural change in polar nanoregion in alkali niobate added Pb(Zn 1/3Nb 2/3) 0.95Ti 0.05O 3 single crystal and its effect on ferroelectric properties

Park, JS and Jung, Y and Lee, JK (2012) Structural change in polar nanoregion in alkali niobate added Pb(Zn 1/3Nb 2/3) 0.95Ti 0.05O 3 single crystal and its effect on ferroelectric properties. Journal of Applied Physics, 112 (7). ISSN 0021-8979

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Abstract

Pb(Zn 1/3Nb 2/3) 0.95Ti 0.05O 3 (PZNT) single crystals with 5 mol.% alkali niobate such as LiNbO 3 (LN), NaNbO 3 (NN), and KNbO 3 (KN) were fabricated by using a flux method to investigate the effect of A-site cation radius on the structure and ferroelectric properties of PZNT under electric field (E-field). Their structure and properties showed different electric field dependence. Polarization versus electric field and strain versus electric field curves of PZNT-0.05LN showed E-field induced phase transition from a relaxor state to a normal ferroelectric state. However, only relaxor behavior was observed in PZNT-0.05NN and PZNT-0.05KN. The effect of A-site ion doping is attributed to the change in local lattice distortion and polar nano-region. When smaller cation such as Li ion substitutes Pb ion, the off-center displacement of Nb ion stabilizes rhombohedral lattice distortion. They, in turn, facilitate the development of macro-domains under electric field (E-field) in PZNT-0.05LN. In contrast, the substitution of Pb with larger cations such as Ni and K decreases the rhombohedral distortion of PZNT, which leads to the disappearance of unique E-field induced phase transition from rhombohedral to tetragonal phase in PZNT. Therefore, non-linear electrostrictive behavior of relaxor ferroelectrics is found in PZNT-0.05NN and PZNT-0.05KN. © 2012 American Institute of Physics.


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Details

Item Type: Article
Status: Published
Creators/Authors:
CreatorsEmailPitt UsernameORCID
Park, JS
Jung, Y
Lee, JKjul37@pitt.eduJUL370000-0002-7778-7679
Centers: Other Centers, Institutes, or Units > Petersen Institute of NanoScience and Engineering
Date: 1 October 2012
Date Type: Publication
Journal or Publication Title: Journal of Applied Physics
Volume: 112
Number: 7
DOI or Unique Handle: 10.1063/1.4757620
Schools and Programs: Swanson School of Engineering > Mechanical Engineering and Materials Science
Refereed: Yes
ISSN: 0021-8979
Date Deposited: 21 Oct 2014 16:44
Last Modified: 16 Feb 2019 16:55
URI: http://d-scholarship.pitt.edu/id/eprint/23377

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