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- W830676691 abstract "In this research, it is showed the best conditions of thermal decomposition of the pure and doped PZT with nickel and tungsten at the concentration of 2, 4, 6 and 8% molar necessary to obtain powders samples with lower amount of the organic matter, aiming the photoluminescent characterization at room temperature. The experimental results obtained for thermal analysis showed that the condition to obtaining amorphous samples with lower amount of the organic matter is directly related with structural order of the perovskite structure. This fact is due the stability of the carboxyllic residual group which is a result of the synthesizing process, the Pechini. The results of the UV visible spectroscopy presented were confirmed by the X ray difratrometry datas in relation to the structural disorder of the amorphous system. The optical gap and multiphonons energy were also determineted by using the UV visible data where the results suggest the creation of new intermediate states within the forbidden band when the sample is a higher structural disorder relativelly at the crystalline phase. Theses new states are responsible for photoluminescent properties at room temperature. Experimental results suggest that the photoluminescent properties at room temperature depend only on the structural disorder, this due the photoluminescent at room temperature has been observed also in the samples that were mechanically amorphized by high milling ball method. In addition, the radiative decay profile of the excited state presented gave the characteristic parameter of the lifetime of the same order for both samples from the thermal decomposition and mechanical amorphization routes. It was also investigated the proposal of the two lifetime, a faster one and slower one, associated to each emissor center through the time-resolved spectroscopy." @default.
- W830676691 created "2016-06-24" @default.
- W830676691 creator A5062116922 @default.
- W830676691 date "2004-01-01" @default.
- W830676691 modified "2023-09-23" @default.
- W830676691 title "Síntese de PZT puro, dopado com níquel e tungstênio, com propriedades fotoluminescentes à temperatura ambiente" @default.
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