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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. doi:10.1021/cm020297v.

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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.

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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.
Funding AgencyGrant Number
Irvine FoundationUNSPECIFIED
Subject Keywords:conductivity CsHsO4 crystals
Issue or Number:9
Record Number:CaltechAUTHORS:20131125-162531441
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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
Deposited By: Jonathan Gross
Deposited On:27 Nov 2013 20:10
Last Modified:10 Nov 2021 16:27

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