Title :
Theoretical study of quantum effect on ferroelectric transition in 18O-isotope exchanged SrTiO3
Author :
Tchouobiap, S. E Mkam ; Mashiyama, H.
Author_Institution :
Department of Physics, Graduate School of Science and Engineering, Yamaguchi University, 1677-1 Yoshida, 753-8512, Japan
Abstract :
A theoretical picture for soft mode behavior and the phase transition in STO18-x is investigated throughout the concentration range x from 0 to 1. The approach was realized through extending the quasi-harmonic approximation to a quantum particle within a local potential of the double-Morse type, and combining the predominant mass effect with the cell volume effect and ferroelectric distortion. It is found that the quantum effects govern the low temperature regime and, the displacive-type phase transition is recognized with perfect softening at Tc for x ?? xc =0.318.
Keywords :
Electronic components; Ferroelectric materials; Frequency; Land surface temperature; Microscopy; Physics; Quantum mechanics; Softening; Strontium; Titanium compounds;
Conference_Titel :
Applications of Ferroelectrics, 2008. ISAF 2008. 17th IEEE International Symposium on the
Conference_Location :
Santa Re, NM, USA
Print_ISBN :
978-1-4244-2744-4
Electronic_ISBN :
1099-4734
DOI :
10.1109/ISAF.2008.4693772
