Vibrational study of the superprotonic phase transition in the mixed crystal Rb2(HSeO4)(H2PO4)

2007 ◽  
Vol 38 (3) ◽  
pp. 344-348 ◽  
Author(s):  
K. Jaouadi ◽  
N. Zouari ◽  
T. Mhiri ◽  
A. Daoud ◽  
F. Romain
Keyword(s):  
Phase Transition ◽  
Mixed Crystal ◽  
Vibrational Study ◽  
Superprotonic Phase Transition ◽  
Superprotonic Phase

Proton conductivity and spontaneous strain below superprotonic phase transition in Rb3H(SeO4)2

2005 ◽  
Vol 176 (31-34) ◽  
pp. 2461-2465 ◽  
Author(s):  
Yasumitsu Matsuo ◽  
Junko Hatori ◽  
Yukihiko Yoshida ◽  
Keiko Saito ◽  
Seiichiro Ikehata
Keyword(s):  
Phase Transition ◽  
Proton Conductivity ◽  
Spontaneous Strain ◽  
Superprotonic Phase Transition ◽  
Superprotonic Phase

Effect of uniaxial stress in superprotonic phase transition in Cs3H(SeO4)2

2008 ◽  
Vol 179 (21-26) ◽  
pp. 1125-1127 ◽  
Author(s):  
Y. Matsuo ◽  
Y. Tanaka ◽  
J. Hatori ◽  
S. Ikehata
Keyword(s):  
Phase Transition ◽  
Uniaxial Stress ◽  
Superprotonic Phase Transition ◽  
Superprotonic Phase

ChemInform Abstract: Superprotonic Phase Transition in CsH(PO3H).

ChemInform ◽  
2010 ◽  
Vol 33 (47) ◽  
pp. no-no
Author(s):  
Calum R. I. Chisholm ◽  
Ryan B. Merle ◽  
Dane A. Boysen ◽  
Sossina M. Haile
Keyword(s):  
Phase Transition ◽  
Superprotonic Phase Transition ◽  
Superprotonic Phase

scholarly journals THERMAL AND ELECTRICAL BEHAVIOUR OF THE SUPERPROTONIC CONDUCTOR PHASE IN Rb2(HSeO4)1.5(H2AsO4)0.5

2014 ◽  
Vol 10 (7) ◽  
pp. 2967-2977
Author(s):  
Noura NOUIRI ◽  
Khaled JAOUADI ◽  
Tahar MHIRI
Keyword(s):  
Phase Transition ◽  
Room Temperature ◽  
Complex Modulus ◽  
Differential Scanning Calorimetric ◽  
Slow Evaporation ◽  
X Ray Diffraction ◽  
Impedance Measurements ◽  
X Ray ◽  
Superprotonic Phase Transition ◽  
Superprotonic Phase

Crystals of a new compound with a superprotonic phase transition Rb2(HSeO4)1.5(H2AsO4)0.5 (noted RbHSeAs), were synthesized by slow evaporation of an aqueous solution at room temperature. The differential scanning calorimetric analyses showed two endothermic peaks at 465 K and 566 K. The last peak corresponds to the decomposition of the material. The first transition was characterized by several techniques (impedance spectroscopy, complex modulus, Raman and X-ray diffraction powder depending on temperature). ac impedance measurements revealed that, upon heating, the compound undergoes at ~ 443 K a sharp increase in conductivity from a low temperature protonic phase to a superprotonic conductivity phase. The activation energies calculated from the modulus (Ef) and impedance (E) spectra respectively are approximately equal, suggesting that the transport properties in this material above and below the superprotonic phase transition (443 K) are probably due to an H+ protons hopping mechanism.

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