Abstract
The influence of magnesium (Mg) substitution (0–100 mol%) for calcium (Ca) has been investigated on structural and dielectric properties of 46.1SiO2-26.9CaO-24.4Na2O-2.6P2O5 (45S5) ceramic. A major phase of combeite (Na2Ca2Si3O9) in ceramics was confirmed by X-ray diffraction (XRD) analysis. Moreover, forsterite (Mg2SiO4) phase was identified along with some minor peaks of sodium magnesium silicate (Na2MgSiO4) with increasing Mg substitution. Variation in crystallite size and microstrain induced by Mg doping in ceramic were investigated using Scherrer relation and Williamson-Hall method. The dielectric measurements revealed an increase in dielectric constant (κ ∼12 × 102 at 100 Hz) and ac conductivity of 45S5 ceramic with 50 mol % Mg substitution for Ca.
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