POLYMORPHISM OF RBH2PO4 (RDP)

Authors
MATTAUCH S PAULUS W GLINNEMANN J HEGER G
Citation
S. Mattauch et al., POLYMORPHISM OF RBH2PO4 (RDP), Physica. B, Condensed matter, 234, 1997, pp. 40-42
Citations number
6
Categorie Soggetti
Physics, Condensed Matter
Journal title
Physica. B, Condensed matter → ACNP
ISSN journal
09214526
Volume
234
Year of publication
1997
Pages
40 - 42
Database
ISI
SICI code
0921-4526(1997)234:<40:POR(>2.0.ZU;2-1
Abstract
A combined X-ray and neutron diffraction study on powder samples and s ingle crystals revealed the following sequence of polymorphic phases: Fdd2 (I) <-- 147 K --> I (4) over bar 2d (II)-357 +/- 7 K --> P2(1)/a (III) <-- 380 +/- 3 K --> P2(1)/m (IV). The low temperature phases I a nd II are iso-structural to those of KDP. The H-ordering in RDP is alm ost complete: at T-c - 1 K, which favours a first-order character of t his ferroelectric phase transition.