Electrical Conductivity of Cancrinite-Type Na8 − 2xCax[Al6Si6O24][CO3] · 2H2O (x ≤ 0.03) Crystals

Abstract

The electrical conductivity of crystals of artificial cancrinite Na_{8 − 2x}Ca_x[Al₆Si₆O₂₄][CO₃] · 2H₂O (x ≤ 0.03) has been studied in the temperature range of 498−604 K. These crystals were grown by hydrothermal synthesis on a seed in the Na₂O–Al₂O₃–SiO₂–H₂O system (t = 380−420°С, P = 3 × 10⁷−9 × 10⁷ Pa). The ionic conductivity of a single-crystal sample (sp. gr. P6₃), measured along the crystallographic axis c, is low: σ = 8 × 10^–7 S/cm at 300°С. The electric transport activation energy is E_a = 0.81 ± 0.05 eV. The relationship between the ionic conductivity and specific features of the atomic structure of cancrinites is discussed.