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Characterisation and phase transitions in a new mixed acid sulphate K0.9Rb0.1HSO4

Published online by Cambridge University Press:  15 May 2002

H. Guermazi ,
M. Bouachir ,
Y. Mlik  and
T. Mhiri
H. Guermazi*
Affiliation:
Département de Physique, Institut préparatoire aux études d'ingénieurs de Sfax, Route Menzel Chaker km 0.5, BP 805, 3018 Sfax, Tunisia
M. Bouachir
Affiliation:
Département de Physique, Institut préparatoire aux études d'ingénieurs de Nabeul, Tunisia
Y. Mlik
Affiliation:
Département de Physique, Institut préparatoire aux études d'ingénieurs de Sfax, Route Menzel Chaker km 0.5, BP 805, 3018 Sfax, Tunisia
T. Mhiri
Affiliation:
Laboratoire de l'état solide, Faculté des Sciences de Sfax, 3038 Sfax, Tunisia
*
hj.tounsi@ipeis.rnu.tn
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Abstract

A new mixed acid sulphate K0.9Rb0.1HSO4 was synthesized at room temperature. It has been firstly characterised by X-ray diffraction (XRD) and vibrational spectroscopy investigations. Then, in order to detect phase transitions and watch changes in the conductivity behaviour, investigations by differential scanning calorimetry (DSC), (XRD), electrical conductivity measurements, and impedance spectroscopy were carried out. The XRD results on single crystals showed that at room temperature, K0.9Rb0.1HSO4 has an orthorhombic symmetry with space group Pbca. The unit cell parameters are: a = 8.39(6) Å; b = 9.79(8) Å and c = 18.98(5) Å. The Raman and infrared spectra at room temperature were also investigated. The structural similarity with KHSO${_4}$ has been confirmed. The thermal studies showed that K0.9Rb0.1HSO4 undergoes two structural phase transitions at about 400 K and 435 K. A partial substitution of K+ by Rb+ increases the conductivity even at room temperature. The transition at 435 K leads to a super-ionic conductor state at high temperatures related with rotational motions of HSO4− ions.

Keywords

Type
Research Article
Information
The European Physical Journal - Applied Physics , Volume 18 , Issue 2 , May 2002 , pp. 99 - 107
Copyright
© EDP Sciences, 2002

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