Examination of the superprotonic transition and dehydration behavior of Cs0.75Rb0.25H2PO4 by thermogravimetric and differential thermal analyses

Ayako Ikeda; Sossina M. Haile

doi:10.1016/j.ssi.2009.10.019

Examination of the superprotonic transition and dehydration behavior of Cs_0.75Rb_0.25H₂PO₄ by thermogravimetric and differential thermal analyses

Ayako Ikeda^*, Sossina M. Haile

^*Corresponding author for this work

Materials Science and Engineering

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

6 Scopus citations

Abstract

The dehydration and the superprotonic transition behavior of Cs_0.75Rb_0.25H₂PO₄ have been investigated via thermogravimetry and differential thermal analysis. To enable measurements under the high water partial pressures required, a high humidity system (p_H2O = 0.02-0.8 atm) capable of weight change detection at 0.7% resolution and thermal events with 0.01 °C resolution was assembled. It has been found that the superprotonic phase transition temperature of Cs_0.75Rb_0.25H₂PO₄ is 231 °C, slightly higher than that of CsH₂PO₄. In contrast, dehydration of Cs_0.75Rb_0.25H₂PO₄ under p_H2O = 0.35 atm occurs at 265 °C, a somewhat lower temperature than that at which CsH₂PO₄ undergoes dehydration. Analysis of the temporal evolution of both transformations suggests a mechanism of continuous nucleation of the high temperature phase at a constant nucleation rate combined with three-dimensional growth.

Original language	English (US)
Pages (from-to)	193-196
Number of pages	4
Journal	Solid State Ionics
Volume	181
Issue number	3-4
DOIs	https://doi.org/10.1016/j.ssi.2009.10.019
State	Published - Feb 24 2010

Keywords

Cesium dihydrogen phosphate
Cesium rubidium dihydrogen phosphate
Dehydration
Rubidium dihydrogen phosphate
Superprotonic transition
Thermogravimetric and differential thermal analysis

ASJC Scopus subject areas

General Chemistry
General Materials Science
Condensed Matter Physics

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10.1016/j.ssi.2009.10.019

Cite this

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title = "Examination of the superprotonic transition and dehydration behavior of Cs0.75Rb0.25H2PO4 by thermogravimetric and differential thermal analyses",

abstract = "The dehydration and the superprotonic transition behavior of Cs0.75Rb0.25H2PO4 have been investigated via thermogravimetry and differential thermal analysis. To enable measurements under the high water partial pressures required, a high humidity system (pH2O = 0.02-0.8 atm) capable of weight change detection at 0.7% resolution and thermal events with 0.01 °C resolution was assembled. It has been found that the superprotonic phase transition temperature of Cs0.75Rb0.25H2PO4 is 231 °C, slightly higher than that of CsH2PO4. In contrast, dehydration of Cs0.75Rb0.25H2PO4 under pH2O = 0.35 atm occurs at 265 °C, a somewhat lower temperature than that at which CsH2PO4 undergoes dehydration. Analysis of the temporal evolution of both transformations suggests a mechanism of continuous nucleation of the high temperature phase at a constant nucleation rate combined with three-dimensional growth.",

keywords = "Cesium dihydrogen phosphate, Cesium rubidium dihydrogen phosphate, Dehydration, Rubidium dihydrogen phosphate, Superprotonic transition, Thermogravimetric and differential thermal analysis",

author = "Ayako Ikeda and Haile, {Sossina M.}",

note = "Funding Information: The authors gratefully acknowledge Mary Louie for providing EDS chemical analysis results. This work has been funded by a Department of Defense MURI award administered by the Army Research Office ( W911NF-07-1-0410 ). Additional support has been provided by the National Science Foundation ( DMR-0520565 ), through the Caltech Center for the Science and Engineering of Materials. ",

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N1 - Funding Information: The authors gratefully acknowledge Mary Louie for providing EDS chemical analysis results. This work has been funded by a Department of Defense MURI award administered by the Army Research Office ( W911NF-07-1-0410 ). Additional support has been provided by the National Science Foundation ( DMR-0520565 ), through the Caltech Center for the Science and Engineering of Materials.

PY - 2010/2/24

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N2 - The dehydration and the superprotonic transition behavior of Cs0.75Rb0.25H2PO4 have been investigated via thermogravimetry and differential thermal analysis. To enable measurements under the high water partial pressures required, a high humidity system (pH2O = 0.02-0.8 atm) capable of weight change detection at 0.7% resolution and thermal events with 0.01 °C resolution was assembled. It has been found that the superprotonic phase transition temperature of Cs0.75Rb0.25H2PO4 is 231 °C, slightly higher than that of CsH2PO4. In contrast, dehydration of Cs0.75Rb0.25H2PO4 under pH2O = 0.35 atm occurs at 265 °C, a somewhat lower temperature than that at which CsH2PO4 undergoes dehydration. Analysis of the temporal evolution of both transformations suggests a mechanism of continuous nucleation of the high temperature phase at a constant nucleation rate combined with three-dimensional growth.

AB - The dehydration and the superprotonic transition behavior of Cs0.75Rb0.25H2PO4 have been investigated via thermogravimetry and differential thermal analysis. To enable measurements under the high water partial pressures required, a high humidity system (pH2O = 0.02-0.8 atm) capable of weight change detection at 0.7% resolution and thermal events with 0.01 °C resolution was assembled. It has been found that the superprotonic phase transition temperature of Cs0.75Rb0.25H2PO4 is 231 °C, slightly higher than that of CsH2PO4. In contrast, dehydration of Cs0.75Rb0.25H2PO4 under pH2O = 0.35 atm occurs at 265 °C, a somewhat lower temperature than that at which CsH2PO4 undergoes dehydration. Analysis of the temporal evolution of both transformations suggests a mechanism of continuous nucleation of the high temperature phase at a constant nucleation rate combined with three-dimensional growth.

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