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首页> 外文期刊>Journal of advanced dielectrics >DIELECTRIC AND PIEZOELECTRIC PROPERTIES OF LEAD-FREE (Bio.5Na_(0.5))_(0.94)Ba_(0.06)TiO_3 + xCe_2O_3 + yLa_2O_3 + zY_2O_3 COMPOUNDS SYNTHESIZED BY SOL-GEL TECHNIQUE
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DIELECTRIC AND PIEZOELECTRIC PROPERTIES OF LEAD-FREE (Bio.5Na_(0.5))_(0.94)Ba_(0.06)TiO_3 + xCe_2O_3 + yLa_2O_3 + zY_2O_3 COMPOUNDS SYNTHESIZED BY SOL-GEL TECHNIQUE

机译：溶胶-凝胶技术合成的无铅（Bio.5Na_（0.5））_（0.94）Ba_（0.06）TiO_3+XCe_2O_3+YLa_2O_3+ZY_2O_3化合物的介电和压电性能

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(Bi_(0.5)Na_(0.5))_(0.49)Ba_(0.06)TiO_3 + xCe_2O_3 + yLa_2O_3 + zY_2O_3 compounds (named BNT-BT-x/y/z) were synthesized by a sol-gel technique, for (x,y,z) = (0,0,0), (0.25, 0.25, 0.25), (0.25, 0.5, 0.5), (0.5, 0.25, 0.25) and (0.5, 0.5, 0.25). The structural variation according to the different system compositions is investigated by X-ray diffraction analyses. The results shows that the addition of Ce_2O_3, La_2O_3 or Y_2O_3 in BNT-BT system, do not modify the crystalline structure, and a rhombohedral-tetragonal morphotropic phase boundary is maintained for different dopant addition. The BNT-BT-x/y/z-based ceramics sintered at relatively low temperature (1100℃) exhibit a good densification ratio. The optimum dielectric and piezoelectric properties are obtained with the BNT-BT-0.5/0.25/0.25 composition. High dielectric properties at room temperature ( ε_r＞1000) and low dielectric losses (tan δ< 4 × 10~(-2)) are obtained for this composition. This compound exhibits a piezoelectric constant d_(33) of 95 pC/N, a good polarization behavior is observed with high remanent polarization P_r of 9.21 μC/cm~2 and low value coercitive field E_C of 2.66 kV/mm.
机译：（Bi_（0.5）Na_（0.5））_（0.49）Ba_（0.06）TiO_3 + x%Ce_2O_3 + y%La_2O_3 + z%Y_2O_3化合物（命名为BNT-BT-x/y/z）采用溶胶-凝胶技术合成，（x，y，z） = （0,0,0.0），（0.25,0.25,0.25），（0.25,0.25），（0.5,0.25），（0.5,0.25）。通过X射线衍射分析研究了不同体系组成的结构变化。结果表明：在BNT-BT体系中加入Ce_2O_3、La_2O_3或Y_2O_3不会改变晶体结构，并且不同掺杂剂的加入保持了菱面体-四方形态相界。在相对较低的温度（1100°C）下烧结的BNT-BT-x/y/z基陶瓷表现出良好的致密化率。使用BNT-BT-0.5/0.25/0.25组合物可获得最佳的介电和压电性能。该组合物在室温下具有高介电性能（ε_r>1000）和低介电损耗（tan δ< 4 × 10~（-2））。该化合物的压电常数d_（33）为95 pC/N，在9.21 μC/cm~2的高剩磁极化P_r和2.66 kV/mm的低值矫顽场E_C下，观察到良好的极化行为。

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