Phase stability of tungsten-bronze-structured KLN ceramics: Effect of excess Nb2O5

Chul Young Jang; Joon Hyung Lee; Jeong Joo Kim; Sang Hee Cho; Hee Young Lee

doi:10.1007/s10832-004-5202-z

Phase stability of tungsten-bronze-structured KLN ceramics: Effect of excess Nb₂O₅

Chul Young Jang, Joon Hyung Lee, Jeong Joo Kim, Sang Hee Cho, Hee Young Lee

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

6 Scopus citations

Abstract

The effect of excess Nb₂O₅ on the phase stability of tungsten-bronze-structured K₃Li₂Nb₅O ₁₅ (KLN) ceramics was studied. Stoichiometric KLN ceramics are not obtained as a single phase and second phases of KNbO₃ and Li ₃NbO₄ were observed. Additionally, stoichiometric KLN is difficult to sinter. In Nb-rich compositions, the second phase disappeared and a single KLN phase was obtained. This phase development behavior, that is, the phase stability of the KLN, was analyzed from the viewpoint of the electrostatic potentials of ions. The calculated Madelung energy of the completely filled stoichiometric KLN was unstable, while Nb-rich compositions showed much reduced Madelung energy, indicating that the ions were stabilized electrostatically. Enhanced sinterability in Nb-rich compositions is also discussed.

Original language	English
Pages (from-to)	847-850
Number of pages	4
Journal	Journal of Electroceramics
Volume	13
Issue number	1-3
DOIs	https://doi.org/10.1007/s10832-004-5202-z
State	Published - Jul 2004

Keywords

KLN
Madelung energy
Phase stability
Tungsten bronze structure

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@article{2e34351ebb0f436db708bcecba332a84,

title = "Phase stability of tungsten-bronze-structured KLN ceramics: Effect of excess Nb2O5",

abstract = "The effect of excess Nb2O5 on the phase stability of tungsten-bronze-structured K3Li2Nb5O 15 (KLN) ceramics was studied. Stoichiometric KLN ceramics are not obtained as a single phase and second phases of KNbO3 and Li 3NbO4 were observed. Additionally, stoichiometric KLN is difficult to sinter. In Nb-rich compositions, the second phase disappeared and a single KLN phase was obtained. This phase development behavior, that is, the phase stability of the KLN, was analyzed from the viewpoint of the electrostatic potentials of ions. The calculated Madelung energy of the completely filled stoichiometric KLN was unstable, while Nb-rich compositions showed much reduced Madelung energy, indicating that the ions were stabilized electrostatically. Enhanced sinterability in Nb-rich compositions is also discussed.",

keywords = "KLN, Madelung energy, Phase stability, Tungsten bronze structure",

author = "Jang, {Chul Young} and Lee, {Joon Hyung} and Kim, {Jeong Joo} and Cho, {Sang Hee} and Lee, {Hee Young}",

year = "2004",

month = jul,

doi = "10.1007/s10832-004-5202-z",

language = "English",

volume = "13",

pages = "847--850",

journal = "Journal of Electroceramics",

issn = "1385-3449",

publisher = "Springer Netherlands",

number = "1-3",

}

TY - JOUR

T1 - Phase stability of tungsten-bronze-structured KLN ceramics

T2 - Effect of excess Nb2O5

AU - Jang, Chul Young

AU - Lee, Joon Hyung

AU - Kim, Jeong Joo

AU - Cho, Sang Hee

AU - Lee, Hee Young

PY - 2004/7

Y1 - 2004/7

N2 - The effect of excess Nb2O5 on the phase stability of tungsten-bronze-structured K3Li2Nb5O 15 (KLN) ceramics was studied. Stoichiometric KLN ceramics are not obtained as a single phase and second phases of KNbO3 and Li 3NbO4 were observed. Additionally, stoichiometric KLN is difficult to sinter. In Nb-rich compositions, the second phase disappeared and a single KLN phase was obtained. This phase development behavior, that is, the phase stability of the KLN, was analyzed from the viewpoint of the electrostatic potentials of ions. The calculated Madelung energy of the completely filled stoichiometric KLN was unstable, while Nb-rich compositions showed much reduced Madelung energy, indicating that the ions were stabilized electrostatically. Enhanced sinterability in Nb-rich compositions is also discussed.

AB - The effect of excess Nb2O5 on the phase stability of tungsten-bronze-structured K3Li2Nb5O 15 (KLN) ceramics was studied. Stoichiometric KLN ceramics are not obtained as a single phase and second phases of KNbO3 and Li 3NbO4 were observed. Additionally, stoichiometric KLN is difficult to sinter. In Nb-rich compositions, the second phase disappeared and a single KLN phase was obtained. This phase development behavior, that is, the phase stability of the KLN, was analyzed from the viewpoint of the electrostatic potentials of ions. The calculated Madelung energy of the completely filled stoichiometric KLN was unstable, while Nb-rich compositions showed much reduced Madelung energy, indicating that the ions were stabilized electrostatically. Enhanced sinterability in Nb-rich compositions is also discussed.

KW - KLN

KW - Madelung energy

KW - Phase stability

KW - Tungsten bronze structure

UR - http://www.scopus.com/inward/record.url?scp=17044392596&partnerID=8YFLogxK

U2 - 10.1007/s10832-004-5202-z

DO - 10.1007/s10832-004-5202-z

M3 - Article

AN - SCOPUS:17044392596

SN - 1385-3449

VL - 13

SP - 847

EP - 850

JO - Journal of Electroceramics

JF - Journal of Electroceramics

IS - 1-3

ER -

Phase stability of tungsten-bronze-structured KLN ceramics: Effect of excess Nb₂O₅

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Keywords

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