NaNO2 + NaNO3 phase diagram: New data from DSC and Raman spectroscopy

Rolf W. Berg; David H. Kerridge; Peter Halvor Larsen

doi:10.1021/je050105n

NaNO₂ + NaNO₃ phase diagram: New data from DSC and Raman spectroscopy

Rolf W. Berg, David H. Kerridge, Peter Halvor Larsen

Department of Chemistry

University of Southampton

Research output: Contribution to journal › Journal article › Research › peer-review

Abstract

The binary phase diagram of sodium nitrite and sodium nitrate is currently not well-understood because four earlier detns. of this binary system resulted in considerably different conclusions. Two works classify the system as eutectic and two as a continuous solid soln. type, together with different sub-solidus curves. New Raman measurements and differential scanning calorimetry data on solidified mixts. of different compns. have provided support for a simple eutectic diagram with a solidus at 230 oC ranging from 0.25 to 0.80 in mole fraction of sodium nitrate. A sub-solidus transition was detected close to 183 oC and a second one close to 160 oC. The latter was considered to be related to the nitrite component and probably arose from the ferroelec. to antiferroelec. or paraelec. transition of sodium nitrite. The change of slope of the maxima of some Raman lines with temp. also gave support to these transitions.

Original language	English
Journal	Journal of Chemical and Engineering Data
Volume	51
Issue number	1
Pages (from-to)	34-39
ISSN	0021-9568
DOIs	https://doi.org/10.1021/je050105n
Publication status	Published - 2006

Bibliographical note

Indexing -- Section 68 (Phase Equilibriums, Chemical Equilibriums, and Solutions)

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10.1021/je050105n

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title = "NaNO2 + NaNO3 phase diagram: New data from DSC and Raman spectroscopy",

abstract = "The binary phase diagram of sodium nitrite and sodium nitrate is currently not well-understood because four earlier detns. of this binary system resulted in considerably different conclusions. Two works classify the system as eutectic and two as a continuous solid soln. type, together with different sub-solidus curves. New Raman measurements and differential scanning calorimetry data on solidified mixts. of different compns. have provided support for a simple eutectic diagram with a solidus at 230 oC ranging from 0.25 to 0.80 in mole fraction of sodium nitrate. A sub-solidus transition was detected close to 183 oC and a second one close to 160 oC. The latter was considered to be related to the nitrite component and probably arose from the ferroelec. to antiferroelec. or paraelec. transition of sodium nitrite. The change of slope of the maxima of some Raman lines with temp. also gave support to these transitions.",

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AB - The binary phase diagram of sodium nitrite and sodium nitrate is currently not well-understood because four earlier detns. of this binary system resulted in considerably different conclusions. Two works classify the system as eutectic and two as a continuous solid soln. type, together with different sub-solidus curves. New Raman measurements and differential scanning calorimetry data on solidified mixts. of different compns. have provided support for a simple eutectic diagram with a solidus at 230 oC ranging from 0.25 to 0.80 in mole fraction of sodium nitrate. A sub-solidus transition was detected close to 183 oC and a second one close to 160 oC. The latter was considered to be related to the nitrite component and probably arose from the ferroelec. to antiferroelec. or paraelec. transition of sodium nitrite. The change of slope of the maxima of some Raman lines with temp. also gave support to these transitions.

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