Study of microstructure and dielectric properties of PMN–PZT ceramics via a mixed powder method including sol–gel precursor

Fabrication and post heat treatment of 0.5Pb (Mg 1/3 Nb 2/3) O 3 -0.5Pb(Zr 0.48 Ti 0.52 )O 3 coatings by supersonic plasma spray

“…It has been known that, the Cure temperature of PMN and PZT is −15 • C and 380 • C respectively. The variation of Cure temperature in the xPMN-(1-x)PZT solid solution system is in the view of PMN modification [26,27]. The phenomenon was discussed below in detail.…”

Effect of Ba(Zn1/3Nb2/3)O3 modification on structure and ferroelectric properties of 0.6Pb(Mg1/3Nb2/3)O3–0.4Pb(Zr0.52Ti0.48)O3 ceramics

“…The PMN consists of very fine grains, and loose agglomerates. In contrast, according to Moetakef and Nematib [14], PZT powder consists of agglomerates with larger polygon grain. However, when PMN and PZT are mixed into PMNZT60/40 bulk, they have 97.63% theoretical density due to the applied pressure during the sintering process.…”

“…5(a), the dielectric constant (ε r ) is found to increase rapidly at temperature 166 1C, suggesting that the phase transition temperature (T C ) occurs at a lower temperature than PMNZT50/ 50 [14,15] and then the ε r rapidly decreases, with no frequency dependence. This behavior suggests that PMNZT60/40 is the normal ferroelectric material, while PMN exhibits the relaxor ferroelectric behavior as a result of a short range ordered structure with heterogeneous in mixed oxide powder [14]. When BZN, a microwave dielectric material, was added to PMNZT60/40, the dielectric constant was observed to significantly decrease with increasing BZN content.…”

“…It is seen that the dielectric properties are comparable to the previous reports on the PMNZT50/50 and PMNZT70/30 materials prepared by the composite method. The dielectric constants are high for the composite method and low for the two-step mixed oxide method [14,15]. Dielectric constants of (1À x)PMNZT60/40-xBZN when x=0, 2.5, 5 7.5 and 10 mol% at room temperature are in the range of 1212-4208.…”

“…Cubic pyrochlore phase exists in PMN ceramics prepared by conventional mixed oxide method and the columbite precursor [10,11] that exhibits low dielectric constants. For the PMNZT system in which oxides were mixed together, previous works have only focused on 0.6PMN-0.4PZT (PMNZT60/40) which is one of the materials consisting of morphotropic phase boundary (MPB) [12][13][14][15]. There has been studies on the dielectric and ferroelectric properties of the ceramics within the entire compositional ranges near MPB [16,17].…”