Abstract
The weak-field dielectric dispersion studies (100 Hz-13 MHz, 100 K < T < 300 K) of pyrochlore relaxor ferroelectric Cd 2 Nb 2 O 7 modified with Ni 2+ or Cu 2+ on the Cd 2+ site (at x = 0.02, 0.1, and 0.2) are presented and discussed. With increasing x, a relaxor behaviour of the system is manifested at higher temperature (around T C = 196 K and above). Around T C, the dielectric absorption spectra and relaxation-time distribution exhibit developing of two LF dielectric relaxation processes, in addition to ferroelectric domain wall motions: non-Debye relaxation typical of relaxors and Debye-like relaxation of quasi-isolated dipoles. The order parameter characterizing a deviation from Curie-Weiss dielectric behaviour in relaxors is nonzero up to ∼280 K, much higher than T C . The role of disorder on the Cd 2+ -site caused by randomly distributed off-center Ni or Cu ions (at x S 0.1) is discussed.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
