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Evidence for a Structural Transition to a Superprotonic CsH2PO4 Phase Under High Pressure

Published online by Cambridge University Press:  01 February 2011

Cristian E. Botez ,
Russell R. Chianelli ,
Jianzhong Zhang ,
Jiang Qian ,
Yusheng Zhao ,
Juraj Majzlan  and
Cristian Pantea
Cristian E. Botez
Affiliation:
[email protected], University of Texas at El Paso, Physics, 500 W. University Ave., El Paso, Texas, 79968, United States, 915-747-8040, 915-747-5447
Russell R. Chianelli
Affiliation:
[email protected], University of Texas at El Paso, Department of Chemistry and Materials Research Institute, El Paso, Texas, 79968, United States
Jianzhong Zhang
Affiliation:
[email protected], Los Alamos National Laboratory, Los Alamos Neutron Scattering Center, Los Alamos, New Mexico, 87545, United States
Jiang Qian
Affiliation:
[email protected], Los Alamos National Laboratory, Los Alamos Neutron Scattering Center, Los Alamos, New Mexico, 87545, United States
Yusheng Zhao
Affiliation:
[email protected], Los Alamos National Laboratory, Los Alamos Neutron Scattering Center, Los Alamos, New Mexico, 87545, United States
Juraj Majzlan
Affiliation:
[email protected], University of Freiburg, Institute of Mineralogy and Geochemistry, Freiburg, N/A, 79104, Germany
Cristian Pantea
Affiliation:
[email protected], Los Alamos National Laboratory, Materials Science and Technology - National High Magnetic Field Laboratory, Los Alamos, New Mexico, 87545, United States
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Abstract

We have used synchrotron X-ray powder diffraction (SXRPD) to investigate the structural behavior of cesium dihydrogen phosphate upon heating. Temperature-resolved data collected at ambient-pressure demonstrate that a transition from the room-temperature monoclinic phase (P21/m; a=7.90Å, b=6.39Å, c=4.87Å, and β=107.64°) to a high-temperature cubic phase (Pm3m; a=4.96Å) occurs at T=237°C. The high-temperature phase is not stable under ambient-pressure conditions, even in the absence of further heating. On the other hand, SXRPD measurements carried out under high-pressure (∼1GPa) evidence a transition from monoclinic to a stable cubic phase (Pm3m, a=4.88Å) at a temperature within the 255°C-275°C range. A 1000-fold increase in the proton conductivity (indicating the transition to the superprotonic phase) was previously observed under the same non-ambient conditions. Therefore, our results represent strong evidence that the superprotonic behavior in cesium dihydrogen phosphate is associated with a monoclinic-to-cubic polymorphic structural transition and not with chemical modifications.

Keywords

ionic conductorx-ray diffraction (XRD)phase transformation
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 929: Symposium II – Materials in Extreme Environments , 2006 , 0929-II02-01
Copyright
Copyright © Materials Research Society 2006

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References

1. Boysen, D.A., Haile, S.M., Liu, H., and Secco, R.A., Chem. Mater. 15, 727 (2003).Google Scholar
2. Haile, S.M., Boysen, D.A., Chisholm, C.R.I., and Merle, R.B., Nature 410, 910 (2001).Google Scholar
3. Boysen, D.A., Uda, T., Chisholm, C.R.I., and Haile, S.M., Science, 303, 68 (2004).Google Scholar
4. Baranov, A.I., Khiznichenko, V.P., and Shuvalov, L.A., Ferroelectrics 100, 135 (1989).Google Scholar
5. Preisinger, A., Mereiter, K., and Bronowska, W., Mat. Sci. Forum 166–169, 511 (1994).Google Scholar
6. Bronowska, W., J. Chem. Phys. 114, 611 (2001).Google Scholar
7. Park, J.-H., Phys. Rev. B 69, 054104 (2004).Google Scholar
8. Ortiz, E., Vargas, R.A., and Mellander, B.-E., J. Chem. Phys. 110, 4847 (1999).Google Scholar
9. Hammersley, A.P., Svenson, S.O., Hanfland, M., Fitch, A.N., and Hauserman, D., High Pressure Research 14, 235 (1996).Google Scholar
10. Matsunaga, H., Itoh, K., and Nakamura, E., J. Phys. Soc. (Japan) 48, 2011 (1980).Google Scholar