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Preparatin of dopped lead-free piezoceramic materials by non-conventional sintering methods
Žaludek, Jakub ; Kachlík, Martin (referee) ; Pouchlý, Václav (advisor)
Piezoceramics BaTiO3 doped with ZrO2 was studied in this thesis. Six different compositions were prepared from base powders of BaTiO3 and ZrO2. with 10, 20, 40, 60, 80 and 90 wt% ZrO2. These mixtures were sintered using convetional sintering method and by Spark Plasma Sintering. Resuting ceramic compacts were subjected to measuring of density, dielectric constant, permitivity, polarization P-E curves, piezoelekctric faktor, loss factor and dilatometric measurements. From these results can be said that i tis possible to create piezoceramic BaTiO3 doped by ZrO2 with relative density higher than 94 %t.d. and these ceramics can possess piezoelectric properties. Value of highest piezoelectrick factor 33=9 / was achieved with addition of 20 wt% ZrO2. Dilatometric measurements discovered effect of increasing ammount of ZrO2 in BaTiO3. Rising amount of ZrO2 had a lowering effect on initial sintering temperature and materials achieved higher relative densities. This was also true for samples sintered using SPS, where it was less obvious. Measuring of electrical properties discoverad electric conductivity for SPS sintered samples, which was most probably caused by carbon introduced into samples during SPS cycle.
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Preparatin of dopped lead-free piezoceramic materials by non-conventional sintering methods
Žaludek, Jakub ; Kachlík, Martin (referee) ; Pouchlý, Václav (advisor)
Piezoceramics BaTiO3 doped with ZrO2 was studied in this thesis. Six different compositions were prepared from base powders of BaTiO3 and ZrO2. with 10, 20, 40, 60, 80 and 90 wt% ZrO2. These mixtures were sintered using convetional sintering method and by Spark Plasma Sintering. Resuting ceramic compacts were subjected to measuring of density, dielectric constant, permitivity, polarization P-E curves, piezoelekctric faktor, loss factor and dilatometric measurements. From these results can be said that i tis possible to create piezoceramic BaTiO3 doped by ZrO2 with relative density higher than 94 %t.d. and these ceramics can possess piezoelectric properties. Value of highest piezoelectrick factor 33=9 / was achieved with addition of 20 wt% ZrO2. Dilatometric measurements discovered effect of increasing ammount of ZrO2 in BaTiO3. Rising amount of ZrO2 had a lowering effect on initial sintering temperature and materials achieved higher relative densities. This was also true for samples sintered using SPS, where it was less obvious. Measuring of electrical properties discoverad electric conductivity for SPS sintered samples, which was most probably caused by carbon introduced into samples during SPS cycle.
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