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dc.contributor.authorTu, Chi-Shun
dc.contributor.authorChen, Cheng-Sao
dc.contributor.authorChen, Pin-Yi
dc.contributor.authorXu, Zhe-Rui
dc.contributor.authorIdzerda, Yves U.
dc.contributor.authorSchmidt, V. Hugo
dc.contributor.authorLyu, M.-Q.
dc.contributor.authorChan, T.-S.
dc.contributor.authorLiu, C.-Y.
dc.identifier.citationC.-S. Tu, C.-S. Chen, P.-Y. Chen, Z.-R. Xu, Y.U. Idzerda, V.H. Schmidt, M.-Q. Lyu, T.-S. Chan, and C.Y. Liu, “Raman vibrations, domain structures, and photovoltaic effects in A-site La-modified BiFeO 3 multiferroic ceramics,” to appear in Journal of the American Ceramic Society (2015). doi: 10.1111/jace.13983.en_US
dc.description.abstractMicro‐Raman spectroscopy, X‐ray diffraction, high‐resolution transmission electron microscopy (TEM), oxygen vacancies, synchrotron X‐ray absorption spectroscopy, magnetizations, optical band gaps, and photovoltaic (PV) effects have been studied in (Bi1−xLax)FeO3 (BFO100xL) ceramics for x = 0.0, 0.05, 0.10, and 0.15. XRD, Raman spectra, and TEM confirm a rhombohedral R3c symmetry with the tilted FeO6 oxygen octahedra in all compounds. The low‐frequency Raman vibrations become broader and shift toward higher frequency as La3+ increases. Fe K‐edge synchrotron X‐ray absorptions reveal that Fe3+ valence and Fe–O–Fe bond angle are not modified by the La3+ substitution. All compounds exhibit a linear antiferromagnetic feature. Optical transmission reveals band gaps in the range of 2.22–2.24 eV. The heterostructures of indium tin oxide (ITO) film/(Bi1−xLax)FeO3 ceramics/Au film show a p–n junction‐like I–V characteristic behavior. The maximal PV power conversion efficiency can reach 0.19% in ITO/BFO15L/Au under illumination of λ = 405 nm. A junction‐like theoretical model can reasonably describe open‐circuit voltage and short‐circuit current as a function of illumination intensity.en_US
dc.description.sponsorshipMinistry of Science and Technology of Taiwan Project Nos. 103‐2112‐M‐030‐001, 103‐2221‐E‐146‐001, and 102‐2221‐E‐131‐006en_US
dc.rightsThis Item is protected by copyright and/or related rights. You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use. For other uses you need to obtain permission from the rights-holder(s).en_US
dc.titleRaman vibrations, domain structures, and photovoltaic effects in A-site La-modified BiFeO 3 multiferroic ceramicsen_US
mus.citation.journaltitleJournal of the American Ceramic Societyen_US
mus.identifier.categoryPhysics & Mathematicsen_US
mus.relation.collegeCollege of Letters & Scienceen_US
mus.relation.universityMontana State University - Bozemanen_US
mus.contributor.orcidIdzerda, Yves U.|0000-0003-2855-856Xen_US

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