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

概要

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Leucite crystals having modified compositions from stoichiometry were prepared by the incorporation of Na^+, Rb^+, Cs^+, Ca^<2+>, Ba^<2+>, and Sb^<3+> 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 tonic size and substitution site in the lattice.
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