Superlattice and Dielectric Properties of BaO-R_2O_3-TiO_2(R=La, Nd and Sm) Microwave Dielectric Compounds

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概要

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• Dielectric crystals having composition in the vicinity of Ba_<3.75>R_<9.5>Ti_<18>O_<54> and/or BaR_2Ti_4O_<12> (R=La, Nd and Sm) were obtained from the melts with BaR_2Ti_5O_<14> 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=22.41O(9), c=7.732(6)Å for Ba_<3.75>La_<9.5>Ti_<18>O_<54>; a=12.189(3), b=22.319(6), c=7.677(4)Å for Ba_<3.75>Nd_<9.5>Ti_<18>O_<54>; a=12.142(4), b=22.300(6), c=7.653(4)Å for Ba_<3.75>Sm_<9.5>Ti_<18>O_<54>. Space group of the fundamental lattice is Pba2 (No. 32) or Pbam (No. 55). The dielectric constants, ε_r, of Ba_<3.75>R_<9.5>Ti_<18>O_<54> (R=Nd and Sm) are in the high range from 78 to 86, and unloaded 〓 values are in the range of 2400 to 3000. The excellent values of single phase are better than those of BaR_2Ti_5O_<14> composition including secondary phases.

• 社団法人応用物理学会の論文
• 1992-09-30

著者

• 大里 齊

  名古屋工大 大学院

• Okuda T

  Nagoya Inst. Of Technol. Nagoya‐shi

• Okuda T

  Isinomaki Senshu Univ. Ishinomaki‐shi Jpn

• OHSATO Hitoshi

  Department of Materials Science and Engineering Institute of Nagoya Institute of Technology

• OKUDA Takashi

  Department of Insect Physiology and Behavior, National Institute of Sericultural and Entomological S

• Ohsato Hitoshi

  Department Of Materials Science And Engineering Graduate School Of Engineering Nagoya Institute Of T

• NISHIGAKI Susumu

  Sumitomo Metal Ceramics Inc.

• Okuda T

  National Inst. Agrobiological Sci.

• Nishigaki S

  Kyushu Inst. Technol. Kitakyushu Jpn

• Okuda Takashi

  Department Of Applied Information Science And Technology Faculty Of Information Science And Technolo

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