SUPERLATTICE AND DIELECTRIC-PROPERTIES OF BAO-R2O3-TIO2 (R = LA, ND AND SM) MICROWAVE DIELECTRIC COMPOUNDS

被引：77

作者：

OHSATO, H ^{[1
]}

NISHIGAKI, S ^{[1
]}

OKUDA, T ^{[1
]}

机构：

[1] SUMITOMO MET CERAM INC,MIDORI KU,NAGOYA 458,JAPAN

来源：

JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS | 1992年 / 31卷 / 9B期

关键词：

MICROWAVE DIELECTRIC COMPOUNDS; BAO-R2O3-TIO2 TERNARY SYSTEM; BA3.75R9.5TI18O54; BAR2TI4O12; (R; LA; ND AND SM); SUPERLATTICE; CRYSTAL DATA BY SINGLE CRYSTALS;

D O I：

10.1143/JJAP.31.3136

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Dielectric crystals having composition in the vicinity, of Ba3.75R9.5Ti18O54 and/or BaR2Ti4O12 (R=La, Nd and Sm) were obtained from the melts with BaR2Ti5O14 composition. A superlattice with two times the fundamental lattice spacing along the c-axis has been found in the three kinds of crystals. Crystal data of the superlattice are as follows: orthorhombic, Pbn2(1) (No. 33) or Pbnm (No. 62); a=12.267(5), b=22.410(9), c=7.732(6) angstrom for Ba3.75La9.5Ti18O54; a=12.189(3), b=22.319(6), c=7.677(4) angstrom for Ba3.75Nd9.5Ti18O54; a=12.142(4), b=22.300(6), c=7.653(4) angstrom for Ba3.75Sm9.5Ti18O54. Space group of the fundamental lattice is Pba2 (No. 32) or Pbam (No. 55). The dielectric constants, epsilon(r), of Ba3.75R9.5Ti18O54 (R=Nd and Sm) are in the high range from 78 to 86, and unloaded Q values are in the range of 2400 to 3000. The excellent values of single phase are better than those of BaR2Ti5O14 composition including secondary phases.

引用

页码：3136 / 3138

页数：3

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