The order-disorder transition temperature in Ba(Zn1/3Ta23)O-3 ceramics has
been investigated using X-ray diffraction (XRD) and transmission electron m
icroscopy (TEM). Samples were quenched into water after annealing at differ
ent temperatures ranging from 1550 to 1625 degreesC/15 h. XRD showed maximu
m ordering for samples annealed and quenched from 1600 degreesC accompanied
by an order of magnitude increase in the size of ordered domains from that
observed in as-sintered samples (20 nm). Although XRD revealed complete di
sorder for samples quenched from 1625 degreesC, (110) zone axis electron di
ffraction patterns revealed the presence of short range 1:1 and 1:2 orderin
g. XRD indicated that samples furnace cooled from 1625 degreesC were also d
isordered but could be re-ordered by annealing at 1500 degrees C. (C) 2001
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