Photostimulated luminescence in PbHPO4 near TC |
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| Institution: | 1. Dep. Optica y Estructura de la Materia and Instituto de Fisica del Estado Sólido (C.S.I.C.) Universidad Autonoma de Madrid. 28049 MADRID, SPAIN;1. University of Silesia, Institute of Chemistry, Szkolna 9, 40-007 Katowice, Poland;2. University of Silesia, Institute of Materials Science, 75 Pułku Piechoty 1A, 41-500 Chorzów, Poland;3. Institute of Low Temperature and Structure Research, Polish Academy of Sciences, Okólna 2, 50–422 Wrocław, Poland;1. College of Nuclear Science and Technology, Beijing Normal University, Beijing 100875, China;2. Beijing Radiation Center, Beijing 100875, China;1. Department of Physics, Sacred Heart College, Chalakudy, Kerala, 680307, India;2. Centre for Advanced Functional Materials, Department of Physics, Bishop Moore College, Mavelikara, Alappuzha, Kerala, 690110, India;3. Department of Physics, Christian College, Chengannur, 689 122, Kerala, India;4. Division of Physics, School of Advanced Sciences, Vellore Institute of Technology (VIT), Chennai, 600127, India |
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| Abstract: | Optical properties (absorption and photoluminescence) of PbHPO4 single crystals have been performed in the range 100 – 350 K, spanning the transition temperature (TC=310 K). An intrinsic luminescene band centered at 450 nm has been observed. The excitation spectrum for this emission shifts with temperature in the ferroelectric phase. The temperature dependence for this shift has been determined as E(T) T, for T<TC. Similar behaviour had been observed in birrefringence measurements (performed by other authors), which yield n T PS2 (spontaneous polarization). The results show that the flourescence is very useful, as an alternative technique, to study the dynamics of the phase transitions. |
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