Effects of La2O3 and Nb2O5 Doping on the Dielectric Properties of Ba0.9Sr0.1TiO3 Ceramics

Wei Chen; Shao Hua Qu; Wan Qiang Cao

doi:10.4028/www.scientific.net/AMR.463-464.453

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 463-464Effects of La2O3 and Nb2O5 Doping on the...

Effects of La₂O₃ and Nb₂O₅ Doping on the Dielectric Properties of Ba_0.9Sr_0.1TiO₃ Ceramics

Abstract:

Ba0.9Sr0.1TiO3 ferroelectric ceramics with dopants of La₂O₃(0, 0.1, 0.1, 0.2 mol%) and Nb₂O₅(0, 0, 0.1, 0.1 mol%) were prepared in solid state process. The double donor substitutions can weaken lattice size effect by the two different size substitutions. XRD method was used to analyze the crystal structure of the samples, and SEM was used to observe the topography, grain’s size and ceramics density. The results of dielectric-frequency relation indicate that when the contents of La₂O₃ and Nb₂O₅ are both 0.10 mol%, the permittivity can reach to 150 000, and the dielectric loss keeps only 0.118. When the total donor content is lower than 0.40 mol%, compensation effect is dominated by electrons. The giant permittivity is attributed to electrons inside grain and insulated grain boundary. When the dopant content is higher than 0.40 mol%, the compensation effect is dominated by the host cation vacancies. The permittivity decreases rapidly with the increase of the donor concentration.