Mmt. Ho et al., Study of the formation mechanism of sol-gel derived SBN powders using Raman spectroscopy and X-ray diffractometry, FERROELECTR, 231(1-4), 1999, pp. 843-848
Sol-gel derived SrxBa1-xNb2O6(SBN) powders of different chemical compositio
n (x = 0.3 to x = 0.75) were prepared at annealing temperatures ranging fro
m 600 degrees C to 1400 degrees C. Their structural properties were studied
by Raman spectroscopy (RS) and X-ray diffractometry (XRD). The annealing t
emperatures for fabrication of tetragonal tungsten bronze (TTB) type SBN ar
e found to depend on the composition. Our results suggest that the developm
ent of TTB phase SBN with x not equal 0.5 follows two parallel reaction rou
tes. At low temperature, the TTB phase SBN50 (x = 0.5) and excess BN or SN
were formed initially. Thereafter these two phases formed the solid solutio
n of SBN at higher annealing temperature.