Topotaxial decomposition of calcite-type KNO3 crystals

S. W. Kennedy; W. M. Kriven

doi:10.1016/0022-4596(80)90405-3

Topotaxial decomposition of calcite-type KNO₃ crystals

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Abstract

The calcite-like form of potassium nitrate, KNO₃, decomposed under the transmission electron microscope to form KNO₂ which subsequently decomposed giving the high-temperature β form of K₂O. Two closely related orientation relations were observed for KNO₂. Referred to the four-molecule cell of KNO₃, they were [111]_NNO₃∥[111]_KNO₂, (011)_KNO₃∥(011)_KNO₂; and [100]_KNO₃∥[111]_KNO₂, (001)_KNO₃∥(001)_KNO₂. These and a different published orientation relation for the decomposition of cadmium carbonate conform, respectively, to orientations resulting from a corresponding structural phase transformation in rubidium nitrate. β-K₂O formed with its cube axes parallel to those of KNO₂. Both nitrate and carbonate reactions can be regarded as topotaxial. Application of the crystallographic approach to orientations and accommodation of misregistry is discussed.

Original language	English (US)
Pages (from-to)	71-77
Number of pages	7
Journal	Journal of Solid State Chemistry
Volume	34
Issue number	1
DOIs	https://doi.org/10.1016/0022-4596(80)90405-3
State	Published - 1980
Externally published	Yes

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Ceramics and Composites
Condensed Matter Physics
Physical and Theoretical Chemistry
Inorganic Chemistry
Materials Chemistry

Online availability

10.1016/0022-4596(80)90405-3

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Cite this

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title = "Topotaxial decomposition of calcite-type KNO3 crystals",

abstract = "The calcite-like form of potassium nitrate, KNO3, decomposed under the transmission electron microscope to form KNO2 which subsequently decomposed giving the high-temperature β form of K2O. Two closely related orientation relations were observed for KNO2. Referred to the four-molecule cell of KNO3, they were [111]NNO3∥[111]KNO2, (011)KNO3∥(011)KNO2; and [100]KNO3∥[111]KNO2, (001)KNO3∥(001)KNO2. These and a different published orientation relation for the decomposition of cadmium carbonate conform, respectively, to orientations resulting from a corresponding structural phase transformation in rubidium nitrate. β-K2O formed with its cube axes parallel to those of KNO2. Both nitrate and carbonate reactions can be regarded as topotaxial. Application of the crystallographic approach to orientations and accommodation of misregistry is discussed.",

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AU - Kennedy, S. W.

AU - Kriven, W. M.

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N2 - The calcite-like form of potassium nitrate, KNO3, decomposed under the transmission electron microscope to form KNO2 which subsequently decomposed giving the high-temperature β form of K2O. Two closely related orientation relations were observed for KNO2. Referred to the four-molecule cell of KNO3, they were [111]NNO3∥[111]KNO2, (011)KNO3∥(011)KNO2; and [100]KNO3∥[111]KNO2, (001)KNO3∥(001)KNO2. These and a different published orientation relation for the decomposition of cadmium carbonate conform, respectively, to orientations resulting from a corresponding structural phase transformation in rubidium nitrate. β-K2O formed with its cube axes parallel to those of KNO2. Both nitrate and carbonate reactions can be regarded as topotaxial. Application of the crystallographic approach to orientations and accommodation of misregistry is discussed.

AB - The calcite-like form of potassium nitrate, KNO3, decomposed under the transmission electron microscope to form KNO2 which subsequently decomposed giving the high-temperature β form of K2O. Two closely related orientation relations were observed for KNO2. Referred to the four-molecule cell of KNO3, they were [111]NNO3∥[111]KNO2, (011)KNO3∥(011)KNO2; and [100]KNO3∥[111]KNO2, (001)KNO3∥(001)KNO2. These and a different published orientation relation for the decomposition of cadmium carbonate conform, respectively, to orientations resulting from a corresponding structural phase transformation in rubidium nitrate. β-K2O formed with its cube axes parallel to those of KNO2. Both nitrate and carbonate reactions can be regarded as topotaxial. Application of the crystallographic approach to orientations and accommodation of misregistry is discussed.

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