Effects of Sm substitution on ferroelectric domains and conductivity in bismuth ferrite ceramics |
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Authors: | Panithan Sriboriboon Benjaporn Yotburut Oradee Srikimkaew Sartanee Suebka Arreerat Jiamprasertboon Santi Maensiri Worasom Kundhikanjana |
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Institution: | 1. School of Physics, Institute of Science, Suranaree University of Technology, Nakhon Ratchasima, 30000, Thailand;2. School of Chemistry, Institute of Science, Suranaree University of Technology, Nakhon Ratchasima, 30000, Thailand |
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Abstract: | The large piezoelectric coefficient and multiferroicity of bismuth ferrite (BFO) make it an attractive candidate for lead-free ferroelectric devices. However, large leakage currents have limited broader applications. Rare-earth substitutions in BFO have been shown to improve ferroelectric and magnetic properties. In this work, we employed piezoresponse and conductive atomic force microscopy to study ferroelectric domains in Bi1-xSmxFeO3 (x = 0–0.150) grown by the co-precipitation method. The combined piezoresponse and conductivity measurements can directly visualize the local ferroelectric domains under different sample bias. At Sm mol% > 7.5, Sm-substitution effectively lowers defect-generated conductivity. At Sm mol% < 7.5, conductivity increases due to conductive domain walls inside sample grains. The surfaces of these conductive samples exhibit a p-type rectifying behavior while the bulk is n-type. Our work details how the local piezoelectric properties and transport behaviors of BFO ceramics change as a function of Sm-substitution. |
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Keywords: | Bismuth ferrite Ferroelectric Piezoelectric Piezoresponse force microscopy Conductive atomic force microscopy |
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