Characterization of potassium lithium niobate (KLN) ceramic system

A. Péter, I. Hajdara, K. Lengyel, G. Dravecz, L. Kovács, M. Tóth

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

The room temperature stability region of the tetragonal tungsten bronze-type potassium lithium niobate (K3Li2Nb5O15, KLN) has been determined by X-ray phase analysis on ceramic samples synthesized by solid state reaction in the composition range of [K2O] = 28-33 mol%, [Li2O] = 12.5-20.5 mol% and [Nb2O5] = 50.5-55.5 mol%. Lattice parameters and temperature dependence of the dielectric constants were measured on single phase samples. The axial a/c ratio of the cell parameters, the density and the Curie temperature of the ferroelectric samples have been found predominantly characteristic for the Nb2O5 content, varying progressively between 3.11-3.14, 4.431-4.596 g/cm3 and 492-460 °C, respectively. The results are discussed from the points of view of defect chemistry and phase stability. The concentration of intrinsic defects formed primarily by antisite Nb atoms at Li sites has been estimated on the basis of "alkali cation vacancy formation model".

Original languageEnglish
Pages (from-to)398-402
Number of pages5
JournalJournal of Alloys and Compounds
Volume463
Issue number1-2
DOIs
Publication statusPublished - Sep 8 2008

Fingerprint

Potassium
Lithium
Defects
Tungsten
Phase stability
Bronze
Alkalies
Curie temperature
Solid state reactions
Lattice constants
Ferroelectric materials
Vacancies
Cations
Permittivity
Positive ions
X rays
Atoms
Temperature
Chemical analysis
lithium niobate

Keywords

  • Ferroelectrics, Optical material
  • Phase diagrams
  • Point defects
  • Solid state reactions

ASJC Scopus subject areas

  • Metals and Alloys

Cite this

Characterization of potassium lithium niobate (KLN) ceramic system. / Péter, A.; Hajdara, I.; Lengyel, K.; Dravecz, G.; Kovács, L.; Tóth, M.

In: Journal of Alloys and Compounds, Vol. 463, No. 1-2, 08.09.2008, p. 398-402.

Research output: Contribution to journalArticle

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AU - Lengyel, K.

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AU - Kovács, L.

AU - Tóth, M.

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N2 - The room temperature stability region of the tetragonal tungsten bronze-type potassium lithium niobate (K3Li2Nb5O15, KLN) has been determined by X-ray phase analysis on ceramic samples synthesized by solid state reaction in the composition range of [K2O] = 28-33 mol%, [Li2O] = 12.5-20.5 mol% and [Nb2O5] = 50.5-55.5 mol%. Lattice parameters and temperature dependence of the dielectric constants were measured on single phase samples. The axial a/c ratio of the cell parameters, the density and the Curie temperature of the ferroelectric samples have been found predominantly characteristic for the Nb2O5 content, varying progressively between 3.11-3.14, 4.431-4.596 g/cm3 and 492-460 °C, respectively. The results are discussed from the points of view of defect chemistry and phase stability. The concentration of intrinsic defects formed primarily by antisite Nb atoms at Li sites has been estimated on the basis of "alkali cation vacancy formation model".

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