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Photoluminescence was studied in six samples of Al 2 O 3 nanopowders produced from the same initial material by calcination in the 800–1400°C temperature range. At temperature around 1200°C phase transition in aluminum oxide lattice occurs; the samples produced at temperatures up to 1200°C contain mainly δ phase, while those obtained at 1400°C contain pure α phase. In all studied samples...
Single crystal of zinc tris-thiourea sulfate (ZTS) was synthesized and grown by the slow evaporation technique at 315K. The effect of temperature on the optical properties of ZTS crystal was studied in the temperature range 293–338K. This range involves the first-order phase transition temperature from ferroelectric to paraelectric phase (323K). At room temperature (293K), the optical transmittance...
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