Titre du document / Document title
Non-ferroelectric phase transitions in potassium hydrogen sulphate [mercallite, KHSO
4]
Auteur(s) / Author(s)
ABDEL-KADER M. M.
(1) ;
EL-SHAWARBY A. ;
HOUSNY W. M. ;
EL-TANAHY Z. H. ;
EL-KABBANY F.
(1) ;
Affiliation(s) du ou des auteurs / Author(s) Affiliation(s)
(1) Cairo univ., fac. sci., physics dep., Giza, EGYPTE
Résumé / Abstract
Accurate measurements of some electrical properties combined with the differential thermal analysis (DTA) were made from room temperature up to 200
oC for single crystals of KHSO
4 (KHS). The data reveal the existence of two (non-ferroelectric) phase transitions around 100
oC and 175
oC. The first structural phase transition may involve only minor change in atomic positions and therefore it is not easy to detect. The existence of this phase is confirmed by the X-ray diffraction pattern. The data are correlated with the arrangement of the molecules in the unit cell including the hydrogen bonding system due to the two distinct HSO
4 ions as well as the onset of the reorientational motion of the sulphate group
Revue / Journal Title
Materials research bulletin
ISSN 0025-5408
CODEN MRBUAC
Source / Source
1994, vol. 29, n
o3, pp. 317-325 (20 ref.)
Langue / Language
Anglais
Editeur / Publisher
Elsevier, London, ROYAUME-UNI
(1966)
(Revue)
Mots-clés anglais / English Keywords
Experimental study ;
Phase transformations ;
Potassium sulfates ;
Acid sulfates ;
Temperature dependence ;
DTA ;
Electric conductivity ;
Capacitance ;
Reorientation ;
Molecular motion ;
Inorganic compounds ;
Mots-clés français / French Keywords
Etude expérimentale ;
Transformation phase ;
Potassium sulfate ;
Hydrogénosulfate ;
Dépendance température ;
ATD ;
Conductivité électrique ;
Capacité électrique ;
Réorientation ;
Mouvement moléculaire ;
KHSO4 ;
H K O S ;
Composé minéral ;
Localisation / Location
INIST-CNRS, Cote INIST : 13343, 35400002559400.0140
Nº notice refdoc (ud4) : 3965939
