Phase transition between two anhydrous modifications of NaHSO4 mediated by heat and water

Christopher D. Zangmeister; Jeanne E. Pemberton

doi:10.1016/j.jssc.2007.03.028

Phase transition between two anhydrous modifications of NaHSO₄ mediated by heat and water

Christopher D. Zangmeister, Jeanne E. Pemberton

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

5 Scopus citations

Abstract

The phase transition between the two anhydrous modifications of NaHSO₄ (α and β) was studied using Raman spectroscopy and differential scanning calorimetry. These measurements indicate that β-NaHSO₄ is a metastable phase and readily undergoes phase transition to thermodynamically stable α-NaHSO₄ with an exothermic enthalpy change of 3.5 kJ/mol. Both thermal (temperatures >434 K) and chemical (exposure to H₂O) pathways were identified for this transition. The transition is irreversible, and α-NaHSO₄ is an intermediate phase between β-NaHSO₄ and NaHSO₄·H₂O. The possible mechanism of the phase transition is discussed.

Original language	English (US)
Pages (from-to)	1826-1831
Number of pages	6
Journal	Journal of Solid State Chemistry
Volume	180
Issue number	6
DOIs	https://doi.org/10.1016/j.jssc.2007.03.028
State	Published - Jun 2007

Keywords

Differential scanning calorimetry
Phase transition
Raman spectroscopy
α-NaHSO
β-NaHSO

ASJC Scopus subject areas

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

Access to Document

10.1016/j.jssc.2007.03.028

Cite this

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title = "Phase transition between two anhydrous modifications of NaHSO4 mediated by heat and water",

abstract = "The phase transition between the two anhydrous modifications of NaHSO4 (α and β) was studied using Raman spectroscopy and differential scanning calorimetry. These measurements indicate that β-NaHSO4 is a metastable phase and readily undergoes phase transition to thermodynamically stable α-NaHSO4 with an exothermic enthalpy change of 3.5 kJ/mol. Both thermal (temperatures >434 K) and chemical (exposure to H2O) pathways were identified for this transition. The transition is irreversible, and α-NaHSO4 is an intermediate phase between β-NaHSO4 and NaHSO4·H2O. The possible mechanism of the phase transition is discussed.",

keywords = "Differential scanning calorimetry, Phase transition, Raman spectroscopy, α-NaHSO, β-NaHSO",

author = "Zangmeister, {Christopher D.} and Pemberton, {Jeanne E.}",

note = "Funding Information: The authors gratefully acknowledge support of this work by the National Science Foundation. The authors also wish to thank Dr. Michael Carducci for his technical assistance.",

year = "2007",

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doi = "10.1016/j.jssc.2007.03.028",

language = "English (US)",

volume = "180",

pages = "1826--1831",

journal = "Journal of Solid State Chemistry",

issn = "0022-4596",

publisher = "Academic Press Inc.",

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TY - JOUR

T1 - Phase transition between two anhydrous modifications of NaHSO4 mediated by heat and water

AU - Zangmeister, Christopher D.

AU - Pemberton, Jeanne E.

N1 - Funding Information: The authors gratefully acknowledge support of this work by the National Science Foundation. The authors also wish to thank Dr. Michael Carducci for his technical assistance.

PY - 2007/6

Y1 - 2007/6

N2 - The phase transition between the two anhydrous modifications of NaHSO4 (α and β) was studied using Raman spectroscopy and differential scanning calorimetry. These measurements indicate that β-NaHSO4 is a metastable phase and readily undergoes phase transition to thermodynamically stable α-NaHSO4 with an exothermic enthalpy change of 3.5 kJ/mol. Both thermal (temperatures >434 K) and chemical (exposure to H2O) pathways were identified for this transition. The transition is irreversible, and α-NaHSO4 is an intermediate phase between β-NaHSO4 and NaHSO4·H2O. The possible mechanism of the phase transition is discussed.

AB - The phase transition between the two anhydrous modifications of NaHSO4 (α and β) was studied using Raman spectroscopy and differential scanning calorimetry. These measurements indicate that β-NaHSO4 is a metastable phase and readily undergoes phase transition to thermodynamically stable α-NaHSO4 with an exothermic enthalpy change of 3.5 kJ/mol. Both thermal (temperatures >434 K) and chemical (exposure to H2O) pathways were identified for this transition. The transition is irreversible, and α-NaHSO4 is an intermediate phase between β-NaHSO4 and NaHSO4·H2O. The possible mechanism of the phase transition is discussed.

KW - Differential scanning calorimetry

KW - Phase transition

KW - Raman spectroscopy

KW - α-NaHSO

KW - β-NaHSO

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DO - 10.1016/j.jssc.2007.03.028

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JO - Journal of Solid State Chemistry

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