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Ferroelectrics
Volume 217, Issue 1, 1998
![Influence of NH4-Rb substitution on the phase transitions with different kinds of proton disorder in mixed [(NH4)1–x Rb x ]3H(SO4)2 crystals](/na101/home/literatum/publisher/tandf/journals/content/gfer20/1998/gfer20.v217.i01/gfer20.v217.i01/production/gfer20.v217.i01.cover.jpg)
Influence of NH4-Rb substitution on the phase transitions with different kinds of proton disorder in mixed [(NH4)1–x Rb x ]3H(SO4)2 crystals
- DOI:
- 10.1080/00150199808015049
pages 285-295
Available online: 09 Mar 2011Abstract
The role of ammonium ions in order–disorder ferroelastic, ferroelectric and structural phase transitions was studied in mixed [(NH4)1–x Rb x ]3H(SO4)2 0 < x < 1 crystals by dielectric spectroscopy and ac calorimetry. A new superprotonic phase was detected in compounds with x > 0·6. It was found that small Rb concentrations, x < 0·05, strongly smear out the temperature anomalies of dielectric constant and specific heat for phase transitions II–III, III–IV, IV–V and V–VIII. At x > 0·09 these phase transitions are fully suppressed. Finally, for Rb concentrations 0·05 < x < 0·9 a proton glass phase appears below 35 K.
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- Citation information:
- Available online: 09 Mar 2011
Author affiliations
- a Institute of Crystallography of RAS, Moscow, 117333, Russia
- b Phys. Dept., Montana State University, Bozeman, MT 59717, USA
- c E-mail:
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