Characterization of nanostructured ceramics prepared by both high energy ball milling and fast firing sintering processes |
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Authors: | Y Leyet F Guerrero E Pérez-Delfín JA Eiras |
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Institution: | 1. Departamento de Física, Facultad de Ciencias Naturales , Universidad de Oriente , Santiago de Cuba C.P. 90500, Cuba;2. Departamento de Física, Facultad de Ciencias Naturales , Universidad de Oriente , Santiago de Cuba C.P. 90500, Cuba;3. Departamento de Física , Grupo de Ceramicas Ferroelétricas, Universidade Federal de S?o Carlos (UFSCar) , S?o Carlos/S?o Paulo CEP: 13565-670, Brazil;4. Departamento de Física , Grupo de Ceramicas Ferroelétricas, Universidade Federal de S?o Carlos (UFSCar) , S?o Carlos/S?o Paulo CEP: 13565-670, Brazil |
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Abstract: | High-energy ball milling technique was successfully applied to calcinated lead zirconate titanate (PZT 60/40) powders. After 20?h of ball milling, large PZT particles were completely broken down, reducing its initial size in three orders of magnitude. Experimental results show a huge sinterability enhancement of the PZT powders by using this technique, achieving its maximum sintering rate at ~800°C. Relatively low densities (~91%) were achieved in stoichiometric samples, while in 3% lead excess samples sintered at 950°C for 30, 45, 60, 90 and 120?min using a fast firing process and a post-annealing treatment at 800°C for 4 h, densities of ~97% of the theoretical were achieved. PZT nanostructured ceramics prepared under optimized processing conditions (60?h of powder milling, 950°C of sintering temperature, 60?min of sintering time and a post-annealing process at 800°C during 4?h) show high dielectric constant (ε′) values (900) and low dielectric loss (tan?δ) at room temperature and a ferroelectric-paraelectric transition temperature at 375°C. |
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Keywords: | high-energy ball milling fast firing PZT nanostructured ceramics dielectric properties |
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