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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 &lt; 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.

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