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Superprotonic Phase Transition in CsH(PO_3H)

Chisholm, Calum R. I. and Merle, Ryan B. and Boysen, Dane A. and Haile, Sossina M. (2002) Superprotonic Phase Transition in CsH(PO_3H). Chemistry of Materials, 14 (9). pp. 3889-3893. ISSN 0897-4756. https://resolver.caltech.edu/CaltechAUTHORS:20131125-162531441

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Abstract

High-temperature investigations of the compound CsH(PO₃H) (or CsH₂PO₃, cesium hydrogen phosphite) revealed that this material undergoes a transition, with an onset of 137 °C, to a phase of high proton conductivity. The transition is accompanied by a large heat of transformation, ΔH = 58 ± 2 J/g (12.4 ± 0.4 kJ/mol), and exhibits measurable hysteresis, occurring at 96 °C upon cooling. High-temperature X-ray powder diffraction showed that the high-temperature phase is cubic, with a₀ = 4.896(1)Å, and likely takes on a CsCl structure, with Cs atoms at the corners of a simple cubic unit cell, and PO₃H groups at the center. The conductivity in the high-temperature phase at 160 °C is 5.5 × 10⁻³ Ω⁻¹ cm⁻¹, and the activation energy for proton transport is 0.40 ± 0.01 eV. These values suggest that proton transport is facilitated by rapid PO₃H group reorientations in the cubic phase of CsH(PO₃H), as is known to occur in the high-temperature, tetragonal phase of CsHSO₄.


Item Type:Article
Related URLs:
URLURL TypeDescription
http:/dx.doi.org/10.1021/cm020297vDOIArticle
http://pubs.acs.org/doi/abs/10.1021%2Fcm020297vPublisherArticle
ORCID:
AuthorORCID
Haile, Sossina M.0000-0002-5293-6252
Alternate Title:Superprotonic Phase Transition in CsH(PO3H)
Additional Information:Copyright © 2002 American Chemical Society. Received March 27, 2002. Revised Manuscript Received June 19, 2002. Publication Date (Web): August 23, 2002. CM020297V. We are pleased to acknowledge the financial support of the National Science Foundation. Additional funding was provided by the Irvine Foundation.
Funders:
Funding AgencyGrant Number
NSFUNSPECIFIED
Irvine FoundationUNSPECIFIED
Subject Keywords:conductivity CsHsO4 crystals
Issue or Number:9
Record Number:CaltechAUTHORS:20131125-162531441
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20131125-162531441
Official Citation:Superprotonic Phase Transition in CsH(PO3H). Calum R. I. Chisholm,Ryan B. Merle,Dane A. Boysen, and, and Sossina M. Haile. Chemistry of Materials 2002 14 (9), 3889-3893.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:42713
Collection:CaltechAUTHORS
Deposited By: Jonathan Gross
Deposited On:27 Nov 2013 20:10
Last Modified:03 Oct 2019 06:01

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