Abstract
Ceramic SrCrO4 samples were prepared via conventional solid state reaction route. Dielectric properties of SrCrO4 were systematically investigated in the frequency range of 102–106 Hz and temperature range of 5–900 K. Colossal dielectric behavior near room temperature and relaxor-like dielectric behavior around 730 K with an extremely high dielectric constant up to 1.62 × 105 were found. Dual relaxation mechanism composed of a dipolar and a Maxwell-Wagner relaxations is found to be responsible for the colossal dielectric behavior. The dipolar relaxation (R1) is related the defect dipole pair of ▪-Cr3+ caused by chemically absorbed water. The Maxwell-Wagner relaxation (R2) results from grain boundaries. The relaxor-like dielectric behavior is associated with the hopping motion of oxygen vacancies which leads to a high-temperature relaxation (R3).
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