Spontaneous polarization as evidence for lithium disordering in LiNbO3

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

The ferroelectric to paraelectric phase transition in lithium niobate is examined. The present study focuses on the microscopic mechanism for this phase transition. Literature reports that give insight into this mechanism are reviewed. Two alternate mechanisms for this second order transition have been discussed previously. The phase transition has been proposed to occur by either (a) cooperative displacement of Li ions or (b) statistical disordering of Li between two octahedral sites in the structure. The present study develops a general Landau expression for the second order phase transition. The spontaneous polarization of the lattice is used as an indicator of the extent of transformation. Then both displacement and disordering models are explored. These are compared with the observed spontaneous polarization data. It is concluded that the spontaneous polarization data are indicative of a Li disordering model, rather than a Li displacement model.

Original languageEnglish
Pages (from-to)1933-1939
Number of pages7
JournalJournal of Materials Research
Volume5
Issue number9
Publication statusPublished - Sep 1990

Fingerprint

Lithium
lithium
Phase transitions
Polarization
polarization
Ferroelectric materials
lithium niobates
Ions
lithium niobate
ions

ASJC Scopus subject areas

  • Materials Science(all)

Cite this

Spontaneous polarization as evidence for lithium disordering in LiNbO3 . / Birnie, Dunbar P.

In: Journal of Materials Research, Vol. 5, No. 9, 09.1990, p. 1933-1939.

Research output: Contribution to journalArticle

@article{b48065bb45d549b69b78cfa484a41646,
title = "Spontaneous polarization as evidence for lithium disordering in LiNbO3",
abstract = "The ferroelectric to paraelectric phase transition in lithium niobate is examined. The present study focuses on the microscopic mechanism for this phase transition. Literature reports that give insight into this mechanism are reviewed. Two alternate mechanisms for this second order transition have been discussed previously. The phase transition has been proposed to occur by either (a) cooperative displacement of Li ions or (b) statistical disordering of Li between two octahedral sites in the structure. The present study develops a general Landau expression for the second order phase transition. The spontaneous polarization of the lattice is used as an indicator of the extent of transformation. Then both displacement and disordering models are explored. These are compared with the observed spontaneous polarization data. It is concluded that the spontaneous polarization data are indicative of a Li disordering model, rather than a Li displacement model.",
author = "Birnie, {Dunbar P}",
year = "1990",
month = "9",
language = "English",
volume = "5",
pages = "1933--1939",
journal = "Journal of Materials Research",
issn = "0884-2914",
publisher = "Materials Research Society",
number = "9",

}

TY - JOUR

T1 - Spontaneous polarization as evidence for lithium disordering in LiNbO3

AU - Birnie, Dunbar P

PY - 1990/9

Y1 - 1990/9

N2 - The ferroelectric to paraelectric phase transition in lithium niobate is examined. The present study focuses on the microscopic mechanism for this phase transition. Literature reports that give insight into this mechanism are reviewed. Two alternate mechanisms for this second order transition have been discussed previously. The phase transition has been proposed to occur by either (a) cooperative displacement of Li ions or (b) statistical disordering of Li between two octahedral sites in the structure. The present study develops a general Landau expression for the second order phase transition. The spontaneous polarization of the lattice is used as an indicator of the extent of transformation. Then both displacement and disordering models are explored. These are compared with the observed spontaneous polarization data. It is concluded that the spontaneous polarization data are indicative of a Li disordering model, rather than a Li displacement model.

AB - The ferroelectric to paraelectric phase transition in lithium niobate is examined. The present study focuses on the microscopic mechanism for this phase transition. Literature reports that give insight into this mechanism are reviewed. Two alternate mechanisms for this second order transition have been discussed previously. The phase transition has been proposed to occur by either (a) cooperative displacement of Li ions or (b) statistical disordering of Li between two octahedral sites in the structure. The present study develops a general Landau expression for the second order phase transition. The spontaneous polarization of the lattice is used as an indicator of the extent of transformation. Then both displacement and disordering models are explored. These are compared with the observed spontaneous polarization data. It is concluded that the spontaneous polarization data are indicative of a Li disordering model, rather than a Li displacement model.

UR - http://www.scopus.com/inward/record.url?scp=0025491674&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0025491674&partnerID=8YFLogxK

M3 - Article

AN - SCOPUS:0025491674

VL - 5

SP - 1933

EP - 1939

JO - Journal of Materials Research

JF - Journal of Materials Research

SN - 0884-2914

IS - 9

ER -