Abstract
Pure and doped with 0.2, 0.5 and 1mol% Co2+ ions PbMoO4 single crystals are grown by the Czochralski method. The electron paramagnetic resonance (EPR) and photoluminescence (PL) are investigated at 4–300K. It is found that weak ferromagnetic interactions with Curie–Weiss temperature of 2.45 and 2.8K are present for PbMoO4 crystals doped with 0.2 and 0.5mol% Co2+ ions, respectively. The magnetic phase changes from ferromagnetic to antiferromagnetic at about 10K. Two emission bands are observed at 515 and 705nm. The red emission is attributed to MoO4 clusters perturbed by O2− vacancies. The temperature dependence of the 515nm emission intensity shows anomalies at ~50 and ~150K, that are suggested to arise from the trapping phenomena and thermal quenching process, respectively.
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