| 铁电晶体PbxBa1-xNb2O6和掺Li,Na的PbxBa1-xNb2O6的结构和电弹张量的测定 |
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| 引用本文： | 许煜寰,王虹,陈焕矗.铁电晶体PbxBa1-xNb2O6和掺Li,Na的PbxBa1-xNb2O6的结构和电弹张量的测定[J].物理学报,1988,37(8):1350-1356. |
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| 作者姓名： | 许煜寰 王虹 陈焕矗 |
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| 作者单位： | (1)山东大学晶体材料研究所; (2)中山大学物理系 |
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| 摘 要： | 用提拉法从熔体中生长出Pb0.37Ba0.63Nb2O6和Pb0.30Ba0.533Na0.306Li0.028Nb2O6两种铁电单晶。用X射线衍射方法分析了两种单晶的结构,结果表明,室温时两种晶体都属于四方晶系点群4mm。测定晶格参数得PBN晶体的a=12.493?和c=3.98?;掺Li,Na的PBN晶体的a=12.493?和c=3.970?。测定了两种晶体全部各52个电弹张量的分量,结果表明PBN晶体具有优良的压电性,其中压电系数d15=108×10-12C/N。这种晶体很有希望用作与厚度切变模式有关的压电换能器材料。掺Li,Na的PBN晶体的介电常数显著降低,而铁电居里点有明显的提高。
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| 收稿时间： | 1987-06-26 |
DETERMINATION OF STRUCTURE AND DIELETRIC, ELASTIC AND PIEZOELECTRIC COEFFICIENTS IN FERROELECTRIC SINGLE CRYSTALS PbxBa1-xNb2O6 AND Li, Na-DOPED PbxBa1-xBb2O6 |
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| XU YU-HUAN,WANG HONG and CHEN HUAN-CHU.DETERMINATION OF STRUCTURE AND DIELETRIC, ELASTIC AND PIEZOELECTRIC COEFFICIENTS IN FERROELECTRIC SINGLE CRYSTALS PbxBa1-xNb2O6 AND Li, Na-DOPED PbxBa1-xBb2O6[J].Acta Physica Sinica,1988,37(8):1350-1356. |
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| Authors: | XU YU-HUAN WANG HONG and CHEN HUAN-CHU |
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| Abstract: | Two ferroelectric single crystals Pb0.37Ba0.63 Nb2O6 and Pb0.30Ba0.533Na0.306Li0.028 Nb2O6,pulled from melt by Czochralski technique, have been studied. By X-ray diffraction, it has been determined that both of two crystals belong to the tetragonal system with lattice parameters a = 12.493 ?, c = 3.984 ? for PBN, and a = 12.493 ?, c=3.970 ? for Li, Na-doped PBN. All of the dielectric, elastic, and piezoelectric coefficients of the two crystals have been measured. The results show that PBN crystal possesses good piezoelectric character with d15≈108×10-12C/N. This crystal could be a promising material for piezoelectric transducers operating in the shear mode. The dielectric constants are reduced, while the Tc is enhanced obviously in PBN doped by Li and Na Ions.
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