Crystalline Characterization and Dielectric Constant of Barium Strontium Titanates Prepared by Solid State Reaction

Retno Maharsi; Anif Jamaluddin; Agus Supriyanto; Yofentina Iriani

doi:10.4028/www.scientific.net/AMR.1123.123

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HomeAdvanced Materials ResearchAdvanced Materials Research Vol. 1123Crystalline Characterization and Dielectric...

Crystalline Characterization and Dielectric Constant of Barium Strontium Titanates Prepared by Solid State Reaction

Abstract:

Barium strontium titanate (BST) materials with the chemical formula of Ba_xSr_1-xTiO₃ had successfully made by solid state reaction method. The materials were made in the form of bulk. Ba mole composition was varied in the value of x = 0,5; 0,7; and 0,9. It was varied to study the influence on crystal structure and dielectric constant. The result of crystalline characterization performed by X-ray diffractometer instrument shows that changes in the composition of x causes a shift in the diffraction angle. The lattice parameter was obtained from the refinement with the GSAS software and calculation process. Lattice parameter of BST with a value of x = 0,5 and 0,7 are a = b = c, so that the crystal structure is cubic. While the BST with a value of x = 0,9 has lattice parameter a = b ≠ c, so that the crystal structure is tetragonal. Dielectric constant measurements performed at frequency of 1 KHz by RLC-meter instrument. The highest dielectric constant was obtained at 465 on Ba_0,9Sr_0,1TiO₃. The dielectric constant of cubic-crystal structured material is bigger than tetragonal-crystal structured material.

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Advanced Materials Research (Volume 1123)

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123-126

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https://doi.org/10.4028/www.scientific.net/AMR.1123.123

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August 2015

Authors:

Retno Maharsi, Anif Jamaluddin, Agus Supriyanto, Yofentina Iriani*

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BST, Dielectric Constant, Ferroelectric, XRD

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