Enhancement of nonlinear optical and temperature dependent dielectric properties of Ce:BaTiO3 nano and submicron particles
作者： P Senthilkumar , S Dhanuskodi , Anitta Rose Thomas , Reji Philip
关键词: Materials science 、 Second-harmonic generation 、 Electronic band structure 、 Tetragonal crystal system 、 Analytical chemistry 、 High-resolution transmission electron microscopy 、 Dielectric 、 Grain boundary 、 Atmospheric temperature range 、 Doping
摘要: The solgel synthesized Ce: BaTiO3 (BT) particles are crystallized in tetragonal structure and the expansion of lattice along a-axis is ensured from Rietveld refined XRD spectra. FTIR shows that increase force constant 199.97 to 213.13 N m−1 owing an effective incorporation heavier atomic mass Ce BT lattice. HRTEM reflects discontinuous planes form Ti vacancies which supported by EDS measurement. modification optical band with ions validated through several absorption defect emission bands. Energy dependent second harmonic generation carried out confirm non saturated signal, thermal stability maximum intensity 2483 counts attained for 2 mol% at 200 mJ. Optical limiting characteristics samples analysed 532 nm using 5 ns laser pulses energy 50, 100 150 µJ. nonlinear coefficient (β) found be enhanced upon doping. Lower thresholds 2.8 3.3 J cm−2 obtained case 1 4 respectively. Dielectric properties a broad temperature range (40–500 °C) frequency (100 Hz–5 MHz) have been investigated detail. dielectric increased 1926 3750 on doping there two semicircles Cole–Cole plot 500 °C due grain boundaries corresponding equivalent circuit model proposed.
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