TY - JOUR
T1 - Phase relations in Ba6-3xLn8+2xTi18O54 (Ln = Nd & Sm) electroceramics
AU - Snashall, Amanda L.
AU - Liu, Yun
AU - Brink, Frank
AU - Withers, Ray L.
AU - Cooper, Steven
PY - 2013
Y1 - 2013
N2 - A careful, systematic investigation of Ba6-3xLn8+2xTi18O54 (BLnTss) ceramics has been performed in order to understand the relationship between composition, microstructure evolution, and microwave dielectric properties. In this paper, we report the effects of composition, morphology, and sintering time on the phase relations and properties of BLnTss (Ln = Nd, Nd/Sm, Sm) ceramics. The microwave dielectric properties of the materials are reported in addition to phase characterisation and structural analysis via X-ray diffraction and field emission scanning electron microscopy coupled with energy dispersive X-ray spectroscopy. BLnTss, x=0.33, ceramics with high Sm content are found to experience a severe degradation of Qf and changes in τcf trending, associated with the onset of globular and needle-like grain morphology and a Ba-Ti rich phase. x=0.67 ceramics with high Nd content are found to exhibit a secondary phase (Nd2Ti2O7) upon prolonged sintering which resulted in beneficial changes to Qf and τcf without affecting εr. Two BLnTss ceramics compositions with near-zero τcf were successfully synthesised with high Qf and εr values.
AB - A careful, systematic investigation of Ba6-3xLn8+2xTi18O54 (BLnTss) ceramics has been performed in order to understand the relationship between composition, microstructure evolution, and microwave dielectric properties. In this paper, we report the effects of composition, morphology, and sintering time on the phase relations and properties of BLnTss (Ln = Nd, Nd/Sm, Sm) ceramics. The microwave dielectric properties of the materials are reported in addition to phase characterisation and structural analysis via X-ray diffraction and field emission scanning electron microscopy coupled with energy dispersive X-ray spectroscopy. BLnTss, x=0.33, ceramics with high Sm content are found to experience a severe degradation of Qf and changes in τcf trending, associated with the onset of globular and needle-like grain morphology and a Ba-Ti rich phase. x=0.67 ceramics with high Nd content are found to exhibit a secondary phase (Nd2Ti2O7) upon prolonged sintering which resulted in beneficial changes to Qf and τcf without affecting εr. Two BLnTss ceramics compositions with near-zero τcf were successfully synthesised with high Qf and εr values.
UR - http://www.scopus.com/inward/record.url?scp=84885577593&partnerID=8YFLogxK
U2 - 10.1155/2013/373079
DO - 10.1155/2013/373079
M3 - Article
SN - 1687-8108
VL - 2013
JO - Advances in Condensed Matter Physics
JF - Advances in Condensed Matter Physics
M1 - 373079
ER -