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Low temperature processing and chacterization of SrBi2Nb2o9thin films grown by pulsed laser ablation

 

作者: S. Bhattacharyya,   S.B. Krupanidhi,  

 

期刊: Integrated Ferroelectrics  (Taylor Available online 2000)
卷期: Volume 31, issue 1-4  

页码: 57-67

 

ISSN:1058-4587

 

年代: 2000

 

DOI:10.1080/10584580008215640

 

出版商: Taylor & Francis Group

 

关键词: PLD;SBN;Ferroeletrics

 

数据来源: Taylor

 

摘要:

Ex-situgrown thin films of SrBi2Nb2O9(SBN) were deposited on platinum substrates using laser ablation technique. A low substrate-temperature-processing route was chosen to avoid any diffusion of bismuth into the Pt electrode. It was observed that the as grown films showed an oriented growth along the ′c′-axis (with zero spontaneous polarization). The as grown films were subsequently annealed to enhance crystallization. Upon annealing, these films transformed into a polycrystalline structure, and exhibited excellent ferroelectric properties. The switching was made to be possible by lowering the thickness without losing the electrically insulating behavior of the films. The hysteresis results showed an excellent square-shaped loop with results (Pr= 4 uC/cm2; Ec= 90 kV/cm) in good agreement with the earlier reports. The films also exhibited a dielectric constant of 190 and a dissipation factor of 0.02, which showed dispersion at low frequencies. The frequency dispersion was found to obey Jonscher's universal power law relation, and was attributed to the ionic charge hopping process according to earlier reports. The dc transport studies indicated an ohmic behavior in the low voltage region, while higher voltages induced a bulk space charge and resulted in non-linear current-voltage dependence.

 

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