Hydrothermal synthesis and characterization of (Bi,K)TiO₃ ferroelectrics

A lead-free ferroelectric (Bi,K)TiO₃ (BKT) was synthesized by a hydrothermal process and characterized systematically at various temperatures. Well-crystallized BKT in the tetragonal phase was identified at a hydrothermal temperature over 220°C. Small cubic particles were observed, regardless of hyd...

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Published inMaterials letters Vol. 67; no. 1; pp. 286 - 288
Main Authors Lim, Jong Bong, Suvorov, Danilo, Kim, Myong-Ho, Jeon, Jae-Ho
Format Journal Article
LanguageEnglish
Published Elsevier B.V 15.01.2012
Subjects
bismuth
Ceramics
Dielectric constant
Ferroelectric materials
Joining
Permittivity
Piezoelectricity
potassium
Stability
Synthesis
temperature
titanium
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Summary:A lead-free ferroelectric (Bi,K)TiO₃ (BKT) was synthesized by a hydrothermal process and characterized systematically at various temperatures. Well-crystallized BKT in the tetragonal phase was identified at a hydrothermal temperature over 220°C. Small cubic particles were observed, regardless of hydrothermal temperature. The BKT sintered at 1050°C was observed to be a typical relaxor behavior and very stable against frequency and temperatures, respectively. The sintered-BKT ceramics exhibited a high temperature of maximum dielectric permittivity (Tₘₐₓ=356°C at 10⁶Hz) with piezoelectric constant (d₃₃=65pC/N) and electromechanical coupling factors (kₚ=0.22, kₜ=0.43). Thus, the sintered-BKT showed excellent temperature stability with a high-Tₘₐₓ and piezoelectric properties.
Bibliography:http://dx.doi.org/10.1016/j.matlet.2011.09.094
ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:0167-577X
1873-4979
DOI:10.1016/j.matlet.2011.09.094