Adak, Mrinal K and Dhak, Prasanta and Singh, Arashdeep and Sen, Shrabanee and Dhak, Debasis (2016) Dielectric relaxation, diffuseness and conductivity behavior of transition metal-ion substituted SrBi2Nb2O9 synthesized by chemical route. Journal of Materials Science-Materials in Electronics, 27 (2). pp. 1535-1546. ISSN 0957-4522

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Nanocrystalline Sr(0.5)A(0.5)Bi(2)Nb(2)O(9) powders (A = Co2+, Ni2+, Cu2+; abbreviated as SCoBN, SNiBN, SCuBN respectively) were synthesized by chemical route. Powder X-ray diffraction study confirmed the tetragonal phase when calcined at 650 A degrees C for 2 h. Average crystallite and particle size were calculated to be between 15 and 25 nm. The tetragonality was increased from Co2+ to Ni2+ to Cu2+-substituted SrBi2Nb2O9. SCuBN showed highest dielectric constant of 1344 and a loss in the order of 10(-2) when measured at 100 kHz. SNiBN and SCuBN showed relaxation behavior and maximum diffusivity of 1.88 was observed for the later composition. The activation energy was calculated from DC and AC conductivity. Hysteresis loops displayed by the ceramics giving rise to a remnant polarization (P-r) of 0.046 mu C/cm(2) and a coercive field (E-c) of 495 V/cm for SCuBN. Both SCuBN and SNiBN showed high fatigue endurance values with a fatigue free behavior up to 10(5) switching cycles.

Item Type: Article
Subjects: Electronics
Divisions: Sensor and Actuator
Depositing User: Bidhan Chaudhuri
Date Deposited: 07 Nov 2016 06:27
Last Modified: 07 Nov 2016 06:27

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