By Topic

Dielectric properties of Zr-modified Pb(Mg1/3Ta2/3)O3 ceramic: Influence of pressure, biasing electric field, and B-site cationic order

Sign In

Cookies must be enabled to login.After enabling cookies , please use refresh or reload or ctrl+f5 on the browser for the login options.

Formats Non-Member Member
$31 $31
Learn how you can qualify for the best price for this item!
Become an IEEE Member or Subscribe to
IEEE Xplore for exclusive pricing!
close button

puzzle piece

IEEE membership options for an individual and IEEE Xplore subscriptions for an organization offer the most affordable access to essential journal articles, conference papers, standards, eBooks, and eLearning courses.

Learn more about:

IEEE membership

IEEE Xplore subscriptions

5 Author(s)
Grubbs, R.K. ; Sandia National Laboratories, Albuquerque, New Mexico 87185 ; Venturini, E.L. ; Samara, G.A. ; Wang, Y.
more authors

Your organization might have access to this article on the publisher's site. To check, click on this link:http://dx.doi.org/+10.1063/1.2375008 

The effects of hydrostatic pressure and biasing dc electric field on the relaxor dielectric response of samples of Pb[(Mg1/3Ta2/3)0.95Zr0.05]O3 with 12%, 15%, and 90% B-site cationic order were investigated. Qualitatively similar decreases in the amplitudes of the real part of the dielectric constant ) at both the peak temperatures (Tm) of the ε(T,ω) response in the high temperature phase, i.e., above Tm, are observed on increasing the three variables: pressure, biasing field, and B-site order - effects that are interpreted in terms of stiffening of the underlying soft ferroelectric mode of the lattice. Strong deviation of the frequency-independent ε(T) from the Curie-Weiss law above Tm, attributed to correlations among polar nanodomains, gives way to adherence to this law above the Burns temperature Td. This is the temperature where polar nanodomains first make their presence known. The evolution with decreasing temperature below Td of short-range order in the nanodomains is estimated from the ε(T) response and shows essentially no dependence on the degree of B-site order. The correlation length for the interaction among the polar nanodomains was also estimated from the dielectric data and found to exhibit strong increase (decrease) with temperature (pressure) as T approaches Tm from above - characteristics of perovskite relaxors. A high temperature dielectric relaxation with an activation energy of - 1.27 eV is observed for the 90% ordered sample, but not for the 12% and 15% ordered samples. This relaxation is attributed to increased oxygen vacancies in the 90% sample that form during the long (64 h) annealing time at 1350 °C to achieve this high level of ordering.

Published in:

Journal of Applied Physics  (Volume:100 ,  Issue: 11 )