Phase formation in the CaTiO3 – La2O3 system in the concentration range 0 – 40 mol.% La2O3 is revisited. Conductivity, dielectric constant, and dielectric loss are measured in the temperature range of 5 – 600°C, and electric strength and the temperature coefficient for dielectric constant (TCε) of perovskite phases in the CaTiO3 – La2O3 system are determined. The ceramic materials studied have a low dielectric loss depending but slightly on temperature [tan d = (1 – 6) × 10–4], a high dielectric constant (ε = 30 – 120), and a TCε varying from – 1480 × 10–6 deg–1 to + 10,500 × 10–6 deg–1 with composition; the zero point for TCε is identified at 23 mol.% La2O3.
Refractories and Industrial Ceramics – Springer Journals
Published: Oct 13, 2004
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