A NEW LOW-TEMPERATURE T(CR)=101-K PHASE-TRANSITION IN (NH4)3H(SEO4)2 EVIDENCED BY SINGLE-CRYSTAL ESR

Authors
AUGUSTYNIAK MA HOFFMANN SK GOSLAR J HILCZER W WOLAK J
Citation
Ma. Augustyniak et al., A NEW LOW-TEMPERATURE T(CR)=101-K PHASE-TRANSITION IN (NH4)3H(SEO4)2 EVIDENCED BY SINGLE-CRYSTAL ESR, Ferroelectrics. Letters section, 15(3-4), 1993, pp. 69-72
Citations number
10
Categorie Soggetti
Physics, Condensed Matter
Journal title
Ferroelectrics. Letters section → ACNP
ISSN journal
07315171
Volume
15
Issue
3-4
Year of publication
1993
Pages
69 - 72
Database
ISI
SICI code
0731-5171(1993)15:3-4<69:ANLTPI>2.0.ZU;2-R
Abstract
Temperature ESR measurements on SeO3--radicals in (NH4)3H(SeO4)2 singl e crystals disclosed new ESR anomalies at T = 101 K. Below this temper ature the hyperfine splitting becomes to be temperature averaged, ESR linewidth shows motional narrowing and an anomaly in forbidden transit ion intensity is observed. Also the dielectric measurements show an an omaly of the epsilon at this temperature. We suggest an existence of a new crystal phase VI below T(cr) = 101 K with NH4-groups ordering and slow SeO4-group dynamics.