Dielectric and structural studies of Ba_2MTi_2Nb_3O_(15) (BMTNO_(15), M = Bi~(3+),La~(3+),Nd~(3+),Sm~(3+),Gd~(3+)) tetragonal tungsten bronze-structured ceramics

M. C. Stennett; I. M. Reaney; G. C. Miles; D. I. Woodward; A. R. West; C. A. Kirk; I. Levin

首页> 外文期刊>Journal of Applied Physics >Dielectric and structural studies of Ba_2MTi_2Nb_3O_(15) (BMTNO_(15), M = Bi~(3+),La~(3+),Nd~(3+),Sm~(3+),Gd~(3+)) tetragonal tungsten bronze-structured ceramics

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Dielectric and structural studies of Ba_2MTi_2Nb_3O_(15) (BMTNO_(15), M = Bi~(3+),La~(3+),Nd~(3+),Sm~(3+),Gd~(3+)) tetragonal tungsten bronze-structured ceramics

机译：Ba_2MTi_2Nb_3O_（15）（BMTNO_（15），M = Bi〜（3 +），La〜（3 +），Nd〜（3 +），Sm〜（3 +），Gd〜（3+）的介电和结构研究））四方钨青铜结构陶瓷

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The structure and dielectric properties of a new family of tetragonal tungsten bronze (TTB) ceramics with the general formula, Ba_2MTi_2Nb_3O_(15) where M = Bi~(3+),La~(3+),Nd~(3+),Sm~(3+),Gd~(3+), have been investigated. Hereafter the compositions will be referred to by the abbreviation BMTNO_(15) where M = B(Bi~(3+)), L(La~(3+)), N(Nd~(3+)), S(Sm~(3+)) or G(Gd~(3+)). BLTNO_(15) [permittivity maximum (T_m)～ -80℃] and BBTNO_(15) (T_m～-100℃) exhibited relaxorlike dielectric behavior. In contrast, BNTNO_(15) (T_m～165℃), BSTNO_(15) (T_m～250℃), and BGTNO_(15) (T_m～320℃) were classic ferroelectrics. T_m increased with decreasing radius of the M ion. Room temperature x-ray powder diffraction (XRD) patterns of all the compounds indexed on a prototype P4/mbm (or P4bm) space group with lattice parameters a ≈ 12.4 A and c ≈ 4 A. However, electron diffraction revealed that the relaxor phases, BLTNO_(15) and BBTNO_(15), exhibited an incommensurate modulation, whereas the classic ferroelectric BNTNO_(15), BSTNO_(15), and BGTNO_(15) featured an orthorhombic superstructure with lattice parameters a ≈ b ≈ √2a_(TTB) and c ≈ 2c_(TTB).

机译：通式为Ba_2MTi_2Nb_3O_（15）的新型四方钨青铜（TTB）陶瓷的结构和介电性能，其中M = Bi〜（3 +），La〜（3 +），Nd〜（3+），研究了Sm〜（3 +），Gd〜（3+）。此后，该组合物将以缩写BMTNO_（15）表示，其中M = B（Bi〜（3 +）），L（La〜（3 +）），N（Nd〜（3 +）），S（Sm 〜（3+））或G（Gd〜（3+））。 BLTNO_（15）[介电常数最大值（T_m）〜-80℃]和BBTNO_（15）（T_m〜-100℃）表现出弛豫状的介电性能。相比之下，BNTNO_（15）（T_m〜165℃），BSTNO_（15）（T_m〜250℃）和BGTNO_（15）（T_m〜320℃）是经典的铁电体。 T_m随着M离子半径的减小而增加。在原型P4 / mbm（或P4bm）空间群上索引的所有化合物的室温X射线粉末衍射（XRD）图谱的晶格参数分别为a≈12.4 A和c≈4A。但是，电子衍射显示弛豫相，BLTNO_（15）和BBTNO_（15）表现出不相称的调制，而经典的铁电体BNTNO_（15），BSTNO_（15）和BGTNO_（15）则具有正交晶上层结构，其晶格参数为a≈b≈√2a_（TTB ）和c≈2c_（TTB）。

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来源
《Journal of Applied Physics》 |2007年第10期|p.104114.1-104114.7|共7页
作者
M. C. Stennett; I. M. Reaney; G. C. Miles; D. I. Woodward; A. R. West; C. A. Kirk; I. Levin;
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Department of Engineering Materials, University of Sheffield, Sheffield S1 3JD, United Kingdom;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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正文语种 eng
中图分类应用物理学;计量学;
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Dielectric and structural studies of Ba_2MTi_2Nb_3O_(15) (BMTNO_(15), M = Bi~(3+),La~(3+),Nd~(3+),Sm~(3+),Gd~(3+)) tetragonal tungsten bronze-structured ceramics

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