粉体および粉末冶金
Online ISSN : 1880-9014
Print ISSN : 0532-8799
ISSN-L : 0532-8799
低損失ジルコン-チタン酸鉛磁器
小谷野 昭夫
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ジャーナル オープンアクセス

1965 年 12 巻 5 号 p. 199-205

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抄録
To improve the mechanical Q of lead zirconate-titanate: Pb(Zr-Ti)O3 ceramics, several effects of additions in small quantity were investigated. As additions, ZnO ; Al2O3 In2O3, Ga2O3 ; NaOH, KOH and RbOH are selected in consideration of their ionic radii and valencies. The results obtained are as follows :
(1) The fine grain structure is obtained by and of these additions except RbOH and the high density is attained in all cases.
(2) The mechanical Q is extremely improved within the limit of the additions of 0.5-1mol%.
(3) Zn2+, Al3+, In3+ and Ga3+ seem to replace the Zr4+-Ti4+ ions and Na+, K and Rb2+ the Pb2+-Sr2++ ions, viewed from the amount of PbO absorption and ionic radii.
(4) An addition of In2O3, ZnO or NaOH sifts the morphotropic phase boundary toward the Ti excess site to some extent.
(5) Assuming that these metallic ions replaced Pb2+-Sr2+ or Zn4+-Ti4+ sites create an oxygenvacancy which is frozen at room temperature, this vacancy will induce an anisotropy. Consequently, it seems that by this induced anisotropy a motion of 90° wall is prevented, and mechanical Q is reduced.
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© 社団法人粉体粉末冶金協会

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