A REORIENTATION OF THE PO3-GROUPS AND RADIATION-DAMAGE EFFECT IN FERROELECTRIC PHASE-TRANSITION STUDIED BY CW-EPR OF PO32- RADICAL IN GLYCINE-CENTER-DOT-H3PO3 SINGLE-CRYSTAL

Authors
MORAWSKI P GRAMZA M GOSLAR J HILCZER W SZCZEPANSKA L HOFFMANN SK
Citation
P. Morawski et al., A REORIENTATION OF THE PO3-GROUPS AND RADIATION-DAMAGE EFFECT IN FERROELECTRIC PHASE-TRANSITION STUDIED BY CW-EPR OF PO32- RADICAL IN GLYCINE-CENTER-DOT-H3PO3 SINGLE-CRYSTAL, Ferroelectrics. Letters section, 23(5-6), 1998, pp. 121-126
Citations number
13
Categorie Soggetti
Physics, Condensed Matter
Journal title
Ferroelectrics. Letters section → ACNP
ISSN journal
07315171
Volume
23
Issue
5-6
Year of publication
1998
Pages
121 - 126
Database
ISI
SICI code
0731-5171(1998)23:5-6<121:AROTPA>2.0.ZU;2-R
Abstract
EPR of gamma-ray generated PO32- radicals indicates that the four radi cal centers are equivalent in the paraelectric phase and become inequi valent in the ferroelectric phase due to a +/-3 degrees rotation. The phase transition temperature is shifted by irradiation from T-c = 224 K to T-c = 180 K. The molecular mechanism of the order-disorder phase transition is discussed.