Lattice Parameter Changes of Leucite by Incorporation of Various Cations Substituted for Potassium.

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  • BAN Seiji
    Department of Dental Material Science, School of Dentistry, Aichi-Gakuin University
  • MATSUO Kenji
    Department of Dental Material Science, School of Dentistry, Aichi-Gakuin University
  • IWASE Haruhiko
    Department of Dental Material Science, School of Dentistry, Aichi-Gakuin University
  • KAIKAWA Kentaro
    Department of Dental Material Science, School of Dentistry, Aichi-Gakuin University
  • HASEGAWA Jiro
    Department of Dental Material Science, School of Dentistry, Aichi-Gakuin University

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Leucite crystals having modified compositions from stoichiometry were prepared by the incorporation of Na+, Rb+, Cs+, Ca2+, Ba2+, and Sb3+ substituted for 5-50 at% of K+ in the leucite. The lattice parameters of the a- and c-axes of these tetragonal leucite were derived from the diffraction angles of (400) and (004) peaks due to tetragonal leucite, respectively. Both lattice parameters of the a- and c-axes of the leucites except Rb and Cs were slightly smaller than those of stoichiometric leucite. The lattice parameters of the a-axis of the leucites containing Rb and Cs were larger than those of stoichiometric leucite (p<0.01) and increased with the content of Rb and Cs. It was concluded that the crystal lattice of leucite was deformed by the incorporation of cations substituted for K and their variations mainly depend upon the kind of cation, namely ionic size and substitution site in the lattice.

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