Further ordering structural investigation of Ba((Co,Zn,Mg)1/3Nb2/3)O3 perovskites by Raman spectroscopy
Further ordering structural investigation of Ba((Co,Zn,Mg)1/3Nb2/3)O3 perovskites by Raman spectroscopy
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通过拉曼光谱进一步研究Ba((Co,Zn,Mg)1/3Nb2/3)O3钙钛矿的有序结构
DOI：
10.1016/j.matchar.2019.109938
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发表时间：
2019-12-01
影响因子：
4.7
通讯作者：
Chen, Xiang Ming
中科院分区：
文献类型：
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作者：
Ma, Pian Pian;Chen, Xiang Ming
通过对BC(Co0-6-x/2Zn0.4的有序结构研究，建立了拉曼振动模式、有序结构与介电性能之间的关系。x/2Mgx)(1/)Nb-3(2/3))O-3陶瓷的拉曼光谱分析。同时对1:2有序Ba（b -1/3’b -2/3”）O-3钙钛矿的拉曼光谱也有了深入的了解。通过透射电镜观察，发现了一个由富NEP层和缺Nb5+层交替组成的近似1:1有序结构，证实了1:2有序结构的四个主要拉曼峰来自于b位亚晶格中1:1有序的纳米级区域。随着x的增加，ba相关声子和nb相关声子的寿命随着有序度和Qf值的增加而增加。同时，氧沿c轴(E-g(（4)) (O)模式）的振动更有利，而ab平面(E-g(（3)) (O)模式）的振动减弱，因为沿有序结构的c轴形成1:2的有序形式。假设氧-八面体拉伸A(1)g(4) (O)模式（类似于788 cm(-1)）的寿命不仅受有序畴尺寸的影响，而且受有序畴边界等微缺陷的影响。
Correlations among the Raman vibration modes, ordering structures and dielectric properties have been established through further ordering structural investigation of BC((Co0-6-x/2Zn0.4.x/2Mgx)(1/)Nb-3(2/3))O-3 ceramics by Raman spectroscopy. Meanwhile an in-depth understanding of Raman spectroscopy for 1:2 ordered Ba(B-1/3'B-2/3 '')O-3 perovskites has been gained. An approximate 1:1 ordered structure composed of alternate NEP -rich and Nb5+-dfficient layers is detected by transmission electron microscopy observation, confirming that the four main Raman peaks of 1:2 ordered structure arise from the nanoscale regions of 1:1 ordering in B-site sublattice. As x increases, Ba-related and Nb-related phonons show growing lifetime with the increase of ordering degree and Qf values. Simultaneously, oxygen vibration along c axis (E-g((4)) (O) mode) is favored, while the vibration in ab plane (E-g((3))) (O) mode) weakens since 1:2 ordering forms along the c-axis of ordered structure. The lifetime of the oxygen-octahedron stretch A(1)g((4)) (O) mode (similar to 788 cm(-1)) is supposed not only influenced by the ordering domain size, but also the micro-defects such as ordering domain boundaries.