Lattice parameter changes of leucite by incorporation of various cations substituted for potassium.
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.
Ban
S
S
Department of Dental Material Science, School of Dentistry, Aichi-Gakuin University, Nagoya, Japan.
Matsuo
K
K
Iwase
H
H
Kaikawa
K
K
Hasegawa
J
J
D000538:Aluminum Silicates / Q000737:chemistry*; D002412:Cations; D003460:Crystallization; D003776:Dental Porcelain / Q000737:chemistry*; D008422:Materials Testing; D008670:Metals / Q000737:chemistry; D015394:Molecular Structure; D011188:Potassium / Q000737:chemistry
D000538:Aluminum Silicates; D002412:Cations; D008670:Metals; D003776:Dental Porcelain; C078519:leucite; D011188:Potassium