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Descripción
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| Abstract: Two different stoichiometric (K0.44Na0.52Li0.04)(Nb0.86Ta0.Sb-10(0.04))O-3 and non-stoichiometric (K0.38Na0.52Li0.04)(Nb0.86Ta0.10Sb0.04) O-2.97 compositions were prepared by the conventional mixed oxide and carbonate route. Low temperature synthesis process at 700 degrees C for 2 h. and further attrition milling process resulted in agglomerated powder of 500nm of primary particles in the range of 50-70nm. The ceramics sintered at 1125 degrees C showed the highest densification that decreased for higher sintering temperatures. Non-stoichiometric composition densification process was assisted through the presence of a liquid phase that promotes grain growth and the appearance of a secondary ferroelectric phase with tungsten-bronze type structure. The samples showed a relaxor type behaviour that diminished because of the compositional homogeneity improvement of the liquid phase in the non-stoichiometric samples. The higher piezoelectric properties were obtained for the samples with high ferroelectric type dielectric constant versus temperature behaviour. In the non-stoichiometric samples piezoelectric constant d(33) values reach similar to 200pC/N. | |
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Internacional
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Si |
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JCR del ISI
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Si |
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Título de la revista
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J EUR CERAM SOC |
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ISSN
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0955-2219 |
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Factor de impacto JCR
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1,562 |
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Información de impacto
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Volumen
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27 |
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DOI
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Número de revista
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13 |
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Desde la página
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4125 |
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Hasta la página
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4129 |
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Mes
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SIN MES |
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