The phase transitions in cesium azide: Temperature and pressure dependent Raman studies

Zafar Iqbal; C. W. Christoe

doi:10.1063/1.430876

The phase transitions in cesium azide: Temperature and pressure dependent Raman studies

Zafar Iqbal, C. W. Christoe

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Abstract

The high temperature and the high pressure induced phase transitions in polycrystalline cesium azide (CsN₃) have been studied by Raman spectroscopy. The remarkable broadening of the E_g rotatory mode with increasing temperature and the observation of quasielastic low frequency scattering in the high temperature phase (Phase I) support the order-disorder character of the temperature induced transition. In the high pressure phase (Phase III), the Raman spectrum shows a decrease in the rotatory mode linewidth and splittings of the lines due to internal modes, suggesting that the new structure is more compact and involves at least two crystallographically nonequivalent azide ion sites. Phase III could not be obtained by lowering the temperature to 20°K at 10^-6 bar.

Original language	English (US)
Pages (from-to)	3246-3251
Number of pages	6
Journal	The Journal of Chemical Physics
Volume	62
Issue number	8
DOIs	https://doi.org/10.1063/1.430876
State	Published - 1974
Externally published	Yes

All Science Journal Classification (ASJC) codes

General Physics and Astronomy
Physical and Theoretical Chemistry

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10.1063/1.430876

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title = "The phase transitions in cesium azide: Temperature and pressure dependent Raman studies",

abstract = "The high temperature and the high pressure induced phase transitions in polycrystalline cesium azide (CsN3) have been studied by Raman spectroscopy. The remarkable broadening of the Eg rotatory mode with increasing temperature and the observation of quasielastic low frequency scattering in the high temperature phase (Phase I) support the order-disorder character of the temperature induced transition. In the high pressure phase (Phase III), the Raman spectrum shows a decrease in the rotatory mode linewidth and splittings of the lines due to internal modes, suggesting that the new structure is more compact and involves at least two crystallographically nonequivalent azide ion sites. Phase III could not be obtained by lowering the temperature to 20°K at 10-6 bar.",

author = "Zafar Iqbal and Christoe, {C. W.}",

year = "1974",

doi = "10.1063/1.430876",

language = "English (US)",

volume = "62",

pages = "3246--3251",

journal = "The Journal of Chemical Physics",

issn = "0021-9606",

publisher = "American Institute of Physics",

number = "8",

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TY - JOUR

T1 - The phase transitions in cesium azide

T2 - Temperature and pressure dependent Raman studies

AU - Iqbal, Zafar

AU - Christoe, C. W.

PY - 1974

Y1 - 1974

N2 - The high temperature and the high pressure induced phase transitions in polycrystalline cesium azide (CsN3) have been studied by Raman spectroscopy. The remarkable broadening of the Eg rotatory mode with increasing temperature and the observation of quasielastic low frequency scattering in the high temperature phase (Phase I) support the order-disorder character of the temperature induced transition. In the high pressure phase (Phase III), the Raman spectrum shows a decrease in the rotatory mode linewidth and splittings of the lines due to internal modes, suggesting that the new structure is more compact and involves at least two crystallographically nonequivalent azide ion sites. Phase III could not be obtained by lowering the temperature to 20°K at 10-6 bar.

AB - The high temperature and the high pressure induced phase transitions in polycrystalline cesium azide (CsN3) have been studied by Raman spectroscopy. The remarkable broadening of the Eg rotatory mode with increasing temperature and the observation of quasielastic low frequency scattering in the high temperature phase (Phase I) support the order-disorder character of the temperature induced transition. In the high pressure phase (Phase III), the Raman spectrum shows a decrease in the rotatory mode linewidth and splittings of the lines due to internal modes, suggesting that the new structure is more compact and involves at least two crystallographically nonequivalent azide ion sites. Phase III could not be obtained by lowering the temperature to 20°K at 10-6 bar.

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DO - 10.1063/1.430876

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JO - The Journal of Chemical Physics

JF - The Journal of Chemical Physics

IS - 8

ER -

The phase transitions in cesium azide: Temperature and pressure dependent Raman studies

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All Science Journal Classification (ASJC) codes

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