Dielectric Relaxation Phenomena in SBN Single Crystals Doped with Ce
Yu. Korchaka, V. Kapustianykb, B. Fedorc, I. Girnykb and Yu. Eliyashevskyib
aIvan Franko National University of Lviv, 107 Tarnavskyi Str., L'viv, 79017, Ukraine
bScientific-Technical and Educational Centre of Low-Temperature Studies, Ivan Franko National University of Lviv, 50 Dragomanov Str., Lviv, 79005, Ukraine
cHetman P. Sahaydachnyi Academy of the Army, 32 Gvardiyska Str., Lviv, 79012, Ukraine
Received: September 24, 2010; revised version: November 25, 2010; in final form: February 25, 2011
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The dielectric study of Sr0.73Ba0.27Nb2O6:Ce (SBN) crystals along [010] crystallographic axis was performed in the temperature region of 310-360 K and frequency range from 25 Hz up to 1 MHz. The thermal dipole relaxation of quasi-Debye-type for this orientation of sample was observed in both investigated structural phases. The phase transition was most clearly seen from the temperature dependence of the relaxation time at Tc = 320 K. The relaxation processes were related to the collective oscillations of the Nb-O bonds in the two different type corner-sharing NbO6 octahedra aligned along c-axis.
DOI: 10.12693/APhysPolA.119.871
PACS numbers: 77.22.-d, 77.22.Ch, 77.22.Gm, 77.80.Jk