Raman spectra, photoluminescence and dielectric relaxation in Bi 1.5ZnNb1.5O7 pyrochlore

Y. Liu; R. L. Withers; H. Chen; Q. Li; H. Tan

doi:10.1016/j.cap.2011.03.014

Raman spectra, photoluminescence and dielectric relaxation in Bi _1.5ZnNb_1.5O₇ pyrochlore

Y. Liu^*, R. L. Withers, H. Chen, Q. Li, H. Tan

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

14 Citations (Scopus)

Abstract

In this paper we investigate the origin of the dielectric relaxation characteristic of the nominally Bi_1.5ZnNb_1.5O₇ (BZN) pyrochlore by a combined investigation of its electron diffraction and temperature-dependent micro-Raman spectra as well as its associated photoluminescence. It is found that the structural disorder and associated structural relaxation in BZN originates from short range chemical ordering of Bi/Zn in the A site of A₂B₂O₇ pyrochlores, which can make a contribution to the overall dielectric permittivity but does not necessitate its dielectric polarisation relaxation. The origin of dielectric polarisation relaxation in BZN is probably attributed to the oxygen vacancies as well as associated defect clusters.

Original language	English
Pages (from-to)	S171-S174
Journal	Current Applied Physics
Volume	11
Issue number	3 SUPPL.
DOIs	https://doi.org/10.1016/j.cap.2011.03.014
Publication status	Published - May 2011

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10.1016/j.cap.2011.03.014

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title = "Raman spectra, photoluminescence and dielectric relaxation in Bi 1.5ZnNb1.5O7 pyrochlore",

abstract = "In this paper we investigate the origin of the dielectric relaxation characteristic of the nominally Bi1.5ZnNb1.5O7 (BZN) pyrochlore by a combined investigation of its electron diffraction and temperature-dependent micro-Raman spectra as well as its associated photoluminescence. It is found that the structural disorder and associated structural relaxation in BZN originates from short range chemical ordering of Bi/Zn in the A site of A2B2O7 pyrochlores, which can make a contribution to the overall dielectric permittivity but does not necessitate its dielectric polarisation relaxation. The origin of dielectric polarisation relaxation in BZN is probably attributed to the oxygen vacancies as well as associated defect clusters.",

keywords = "Electron diffraction, Pyrochlore, Relaxor dielectric, Structural disorder",

author = "Y. Liu and Withers, {R. L.} and H. Chen and Q. Li and H. Tan",

year = "2011",

month = may,

doi = "10.1016/j.cap.2011.03.014",

language = "English",

volume = "11",

pages = "S171--S174",

journal = "Current Applied Physics",

issn = "1567-1739",

publisher = "Elsevier B.V.",

number = "3 SUPPL.",

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TY - JOUR

T1 - Raman spectra, photoluminescence and dielectric relaxation in Bi 1.5ZnNb1.5O7 pyrochlore

AU - Liu, Y.

AU - Withers, R. L.

AU - Chen, H.

AU - Li, Q.

AU - Tan, H.

PY - 2011/5

Y1 - 2011/5

N2 - In this paper we investigate the origin of the dielectric relaxation characteristic of the nominally Bi1.5ZnNb1.5O7 (BZN) pyrochlore by a combined investigation of its electron diffraction and temperature-dependent micro-Raman spectra as well as its associated photoluminescence. It is found that the structural disorder and associated structural relaxation in BZN originates from short range chemical ordering of Bi/Zn in the A site of A2B2O7 pyrochlores, which can make a contribution to the overall dielectric permittivity but does not necessitate its dielectric polarisation relaxation. The origin of dielectric polarisation relaxation in BZN is probably attributed to the oxygen vacancies as well as associated defect clusters.

AB - In this paper we investigate the origin of the dielectric relaxation characteristic of the nominally Bi1.5ZnNb1.5O7 (BZN) pyrochlore by a combined investigation of its electron diffraction and temperature-dependent micro-Raman spectra as well as its associated photoluminescence. It is found that the structural disorder and associated structural relaxation in BZN originates from short range chemical ordering of Bi/Zn in the A site of A2B2O7 pyrochlores, which can make a contribution to the overall dielectric permittivity but does not necessitate its dielectric polarisation relaxation. The origin of dielectric polarisation relaxation in BZN is probably attributed to the oxygen vacancies as well as associated defect clusters.

KW - Electron diffraction

KW - Pyrochlore

KW - Relaxor dielectric

KW - Structural disorder

UR - http://www.scopus.com/inward/record.url?scp=80255122750&partnerID=8YFLogxK

U2 - 10.1016/j.cap.2011.03.014

DO - 10.1016/j.cap.2011.03.014

M3 - Article

SN - 1567-1739

VL - 11

SP - S171-S174

JO - Current Applied Physics

JF - Current Applied Physics

IS - 3 SUPPL.

ER -

Raman spectra, photoluminescence and dielectric relaxation in Bi _1.5ZnNb_1.5O₇ pyrochlore

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