Superstructure of mullite-type KAl9O14

Biljana Lazic; Hannes Krüger; Reinhard Kaindl; Lukas Perfler; Aleksandar Kremenović; Vladica Cvetković; Ray L. Withers

doi:10.1021/cm3038476

Superstructure of mullite-type KAl₉O₁₄

Biljana Lazic^*, Hannes Krüger, Reinhard Kaindl, Lukas Perfler, Aleksandar Kremenović, Vladica Cvetković, Ray L. Withers

^*Corresponding author for this work

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

10 Citations (Scopus)

Abstract

Large whiskers of a new KAl₉O₁₄ polymorph with mullite-type structure were synthesized. The chemical composition of the crystals was confirmed by energy-dispersive X-ray spectroscopy, and the structure was determined using single-crystal X-ray diffraction. Nanosized twin domains and one-dimensional diffuse scattering were observed utilizing transmission electron microscopy. The compound crystallizes in space group P2₁/n (a = 8.1880(8), b = 7.6760(7), c = 8.7944(9) Å, β = 110.570(8), V = 517.50(9) Å³, Z = 2). Crystals of KAl ₉O₁₄ exhibit a mullite-type structure with linear edge-sharing AlO₆ octahedral chains connected with groups of two AlO₄ tetrahedra and one AlO₅ trigonal bipyramid. Additionally, disproportionation of KAl₉O₁₄ into K β-alumina and corundum was observed using in situ high-temperature optical microscopy and Raman spectroscopy.

Original language	English
Pages (from-to)	496-502
Number of pages	7
Journal	Chemistry of Materials
Volume	25
Issue number	3
DOIs	https://doi.org/10.1021/cm3038476
Publication status	Published - 12 Feb 2013

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10.1021/cm3038476

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@article{feaa2cd551064bda8f9fb57f8e049425,

title = "Superstructure of mullite-type KAl9O14",

abstract = "Large whiskers of a new KAl9O14 polymorph with mullite-type structure were synthesized. The chemical composition of the crystals was confirmed by energy-dispersive X-ray spectroscopy, and the structure was determined using single-crystal X-ray diffraction. Nanosized twin domains and one-dimensional diffuse scattering were observed utilizing transmission electron microscopy. The compound crystallizes in space group P21/n (a = 8.1880(8), b = 7.6760(7), c = 8.7944(9) {\AA}, β = 110.570(8), V = 517.50(9) {\AA}3, Z = 2). Crystals of KAl 9O14 exhibit a mullite-type structure with linear edge-sharing AlO6 octahedral chains connected with groups of two AlO4 tetrahedra and one AlO5 trigonal bipyramid. Additionally, disproportionation of KAl9O14 into K β-alumina and corundum was observed using in situ high-temperature optical microscopy and Raman spectroscopy.",

keywords = "diffuse scattering, mullite-type, stacking faults, superstructure, whiskers",

author = "Biljana Lazic and Hannes Kr{\"u}ger and Reinhard Kaindl and Lukas Perfler and Aleksandar Kremenovi{\'c} and Vladica Cvetkovi{\'c} and Withers, {Ray L.}",

year = "2013",

month = feb,

day = "12",

doi = "10.1021/cm3038476",

language = "English",

volume = "25",

pages = "496--502",

journal = "Chemistry of Materials",

issn = "0897-4756",

publisher = "American Chemical Society",

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TY - JOUR

T1 - Superstructure of mullite-type KAl9O14

AU - Lazic, Biljana

AU - Krüger, Hannes

AU - Kaindl, Reinhard

AU - Perfler, Lukas

AU - Kremenović, Aleksandar

AU - Cvetković, Vladica

AU - Withers, Ray L.

PY - 2013/2/12

Y1 - 2013/2/12

N2 - Large whiskers of a new KAl9O14 polymorph with mullite-type structure were synthesized. The chemical composition of the crystals was confirmed by energy-dispersive X-ray spectroscopy, and the structure was determined using single-crystal X-ray diffraction. Nanosized twin domains and one-dimensional diffuse scattering were observed utilizing transmission electron microscopy. The compound crystallizes in space group P21/n (a = 8.1880(8), b = 7.6760(7), c = 8.7944(9) Å, β = 110.570(8), V = 517.50(9) Å3, Z = 2). Crystals of KAl 9O14 exhibit a mullite-type structure with linear edge-sharing AlO6 octahedral chains connected with groups of two AlO4 tetrahedra and one AlO5 trigonal bipyramid. Additionally, disproportionation of KAl9O14 into K β-alumina and corundum was observed using in situ high-temperature optical microscopy and Raman spectroscopy.

AB - Large whiskers of a new KAl9O14 polymorph with mullite-type structure were synthesized. The chemical composition of the crystals was confirmed by energy-dispersive X-ray spectroscopy, and the structure was determined using single-crystal X-ray diffraction. Nanosized twin domains and one-dimensional diffuse scattering were observed utilizing transmission electron microscopy. The compound crystallizes in space group P21/n (a = 8.1880(8), b = 7.6760(7), c = 8.7944(9) Å, β = 110.570(8), V = 517.50(9) Å3, Z = 2). Crystals of KAl 9O14 exhibit a mullite-type structure with linear edge-sharing AlO6 octahedral chains connected with groups of two AlO4 tetrahedra and one AlO5 trigonal bipyramid. Additionally, disproportionation of KAl9O14 into K β-alumina and corundum was observed using in situ high-temperature optical microscopy and Raman spectroscopy.

KW - diffuse scattering

KW - mullite-type

KW - stacking faults

KW - superstructure

KW - whiskers

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U2 - 10.1021/cm3038476

DO - 10.1021/cm3038476

M3 - Article

SN - 0897-4756

VL - 25

SP - 496

EP - 502

JO - Chemistry of Materials

JF - Chemistry of Materials

IS - 3

ER -

Superstructure of mullite-type KAl₉O₁₄

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