不同烧结温度对PMN基铁电陶瓷B位有序度的影响

Effect of Sintering Temperature on B-Site Order of Pb(Mg_(1/3)Nb_(2/3))O_3 -Based Ferroelectric Ceramics

本文研究了不同烧结温度下,CuO添加对0.94PMN-0.06PT(PMN-6PT)弛豫铁电陶瓷B位化学有序度的影响。拉曼和XRD分析结果表明,不同的烧结温度下,离子取代不同,对B位有序度的影响不同。烧结温度在950℃时,主要是Cu2+进入晶格,不影响B位化学有序度;烧结温度在1 080℃时,主要是Cu1+进入晶格,B位化学有序度改变。介温测试所表现出来的弛豫特性与拉曼分析有序度的结果相一致。

The effect of CuO doping on B-site order of 0.94Pb （Mg1/3Nb2/3）O3-0.06PbTiO3 （abbreviated as PMN- 6PT） ceramics with different sintering temperatures was studied. The Raman and XRD results revealed that under different sintering temperature, ion substitution was different, which had different influence to B-site order. Sintering temperature at 950 ℃, Cu2＋ ions entered the crystal lattice and made no difference in the B-site order. However, Sintering temperature at 1 080 ℃, Cu1＋ ions entered the crystal lattice and had an effect in the B-site order. The dependence of dielectric constant on temperature illustrated an obvious relaxor characteristic for CuO doped PMN-based ceramics, which was in accord with Raman spectra analysis.