Configuration of point defects of impurity-doped congruent lithium niobate

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  • 不純物添加したニオブ酸リチウムの点欠陥形態
  • フジュンブツ テンカ シタ ニオブサン リチウム ノ テン ケッカン ケイタイ

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Abstract

<p>  The defect structures of impurity-doped congruent lithium niobates (c-LN) were investigated by combining lattice constant measurements with thermodynamic analyses. On the basis of the “Li site vacancy model”, six kinds of defect structures in impurity-doped c-LN are possible. Using thermodynamic constraints, these can be narrowed down to two kinds. The thermodynamic analyses showed impurities are located at only the Li or Nb site in the range where antisite niobium exists. Based on the thermodynamic analyses, lattice constant measurement revealed that divalent and trivalent impurities were located at Li sites in LN, whereas tetravalent impurities were located at Nb sites. This result provides good clues for controlling intrinsic point defects.</p>

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