Synthesis and structural study of the KNb4O6-type compound

Wataru Sugimoto; Ken Mimuro; Yoshiyuki Sugahara; Kazuyuki Kuroda

doi:10.2109/jcersj.107.318

Synthesis and structural study of the KNb₄O₆-type compound

Wataru Sugimoto, Ken Mimuro, Yoshiyuki Sugahara, Kazuyuki Kuroda

School of Advanced Science and Engineering

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

2 Citations (Scopus)

Abstract

Polycrystalline samples with nominal compositions K_1+xNb₄O₆ (0≤x≤1.0) were prepared by the solid-state reaction of KNbO₃, Nb₂O₅ and Mb. Powder X-ray diffraction analysis revealed that the KNb₄O₆-type compound was obtained as the major phase when x≥0.4. Transmission electron microscopy observations showed that when x=0.4, the KNb₄O₆-type compound contained intergrowth defects. In contrast, when x=1.0, practically no intergrowth defects were observed, although this sample contained KNbO₃ as an impurity phase. The relation between the nominal composition and the formation of the intergrowth defects is discussed.

Original language	English
Pages (from-to)	318-321
Number of pages	4
Journal	Journal of the Ceramic Society of Japan
Volume	107
Issue number	4
DOIs	https://doi.org/10.2109/jcersj.107.318
Publication status	Published - 1999

Keywords

Intergrowth defects
Perovskite
Reduced niobate
Rietveld analysis
Transmission electron microscopy

ASJC Scopus subject areas

Ceramics and Composites
Chemistry(all)
Condensed Matter Physics
Materials Chemistry

Access to Document

10.2109/jcersj.107.318

Cite this

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title = "Synthesis and structural study of the KNb4O6-type compound",

abstract = "Polycrystalline samples with nominal compositions K1+xNb4O6 (0≤x≤1.0) were prepared by the solid-state reaction of KNbO3, Nb2O5 and Mb. Powder X-ray diffraction analysis revealed that the KNb4O6-type compound was obtained as the major phase when x≥0.4. Transmission electron microscopy observations showed that when x=0.4, the KNb4O6-type compound contained intergrowth defects. In contrast, when x=1.0, practically no intergrowth defects were observed, although this sample contained KNbO3 as an impurity phase. The relation between the nominal composition and the formation of the intergrowth defects is discussed.",

keywords = "Intergrowth defects, Perovskite, Reduced niobate, Rietveld analysis, Transmission electron microscopy",

author = "Wataru Sugimoto and Ken Mimuro and Yoshiyuki Sugahara and Kazuyuki Kuroda",

year = "1999",

doi = "10.2109/jcersj.107.318",

language = "English",

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pages = "318--321",

journal = "Nippon Seramikkusu Kyokai Gakujutsu Ronbunshi/Journal of the Ceramic Society of Japan",

issn = "1882-0743",

publisher = "Ceramic Society of Japan/Nippon Seramikkusu Kyokai",

number = "4",

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TY - JOUR

T1 - Synthesis and structural study of the KNb4O6-type compound

AU - Sugimoto, Wataru

AU - Mimuro, Ken

AU - Sugahara, Yoshiyuki

AU - Kuroda, Kazuyuki

PY - 1999

Y1 - 1999

N2 - Polycrystalline samples with nominal compositions K1+xNb4O6 (0≤x≤1.0) were prepared by the solid-state reaction of KNbO3, Nb2O5 and Mb. Powder X-ray diffraction analysis revealed that the KNb4O6-type compound was obtained as the major phase when x≥0.4. Transmission electron microscopy observations showed that when x=0.4, the KNb4O6-type compound contained intergrowth defects. In contrast, when x=1.0, practically no intergrowth defects were observed, although this sample contained KNbO3 as an impurity phase. The relation between the nominal composition and the formation of the intergrowth defects is discussed.

AB - Polycrystalline samples with nominal compositions K1+xNb4O6 (0≤x≤1.0) were prepared by the solid-state reaction of KNbO3, Nb2O5 and Mb. Powder X-ray diffraction analysis revealed that the KNb4O6-type compound was obtained as the major phase when x≥0.4. Transmission electron microscopy observations showed that when x=0.4, the KNb4O6-type compound contained intergrowth defects. In contrast, when x=1.0, practically no intergrowth defects were observed, although this sample contained KNbO3 as an impurity phase. The relation between the nominal composition and the formation of the intergrowth defects is discussed.

KW - Intergrowth defects

KW - Perovskite

KW - Reduced niobate

KW - Rietveld analysis

KW - Transmission electron microscopy

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