Low temperature fabrication and impedance spectroscopy of PMN-PT ceramics

Dielectric and electrical properties of Sr5EuCr3Nb7O30 nanoceramics prepared using a novel chemical route

“…A more or less single semicircle curve representative of a single phase Sr 5 EuCr 3 Nb 7 O 30 compound with a single relaxation process occurs in all the six cases. As reported in SrBi 2 Ta 2 O 9 or Na 0.5 Bi 0.5 TiO 3 [12,24], the single semicircle represents that the impedance contribution is primarily due to the grains. A little deviation occurs from the semicircle in the secondary effects from the grain surfaces or grain boundaries at the low temperatures in curves (a) and (b).…”

A.C. Impedance analysis of the effect of dopant concentration on electrical properties of calcium modified BaSnO3

“…The decrease in Z with rise in temperature and frequencies indicates the possibility of an increase in the ac conductivity with increasing temperature and frequency [20]. The merging of real part of the impedance (Z ) curves in the higher frequency region may be attributed to release of space charge as a result of lowering of the barrier properties of the materials at higher temperatures in the high frequency region [21]. An enhancement in the value of Z with increasing Ca concentration may possibly be due to a decrease in the conduction path arising as a result of the lattice distortion on Ca-doping in BaSnO 3 .…”

Effect of Pb Volatilization on Dielectric Properties of 0.77PbMg1/3(Nb0.9Ta0.1)2/3O3-0.23PbTiO3

“…We found that in the range of extra PbO from 0.3 to 0.8 g, almost pure perovskite was obtained (94wt% perovskite). As reported 9 , lead loss due to volatilization of PbO during sintering leads to the formation of a Pb-deficient pyrochlore, and conversely, excess PbO promotes formation of a Pb-rich pyrochlore. Pyrochlore phase mostly occurs at the surface of the plates 10 .…”