Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8013601 | Materials Letters | 2018 | 12 Pages |
Abstract
The crystal structure of (1-x)KNbO3-xBiFeO3 (KNBF) and (1-x)KNbO3-LaFeO3 (KNLF) (where xâ¯=â¯0.00; 0.01; 0.02; 0.04; 0.08; 0.16; 0.32) was evaluated by XRD and Raman spectroscopy. XRD data show the crystal symmetry to evolve from orthorhombic to tetragonal with increasing x. The optical bandgap was found to narrow systematically with increasing x. Raman spectroscopy analysis corroborated long-range polar order in all compositions. The photoresponse of xâ¯=â¯0.32 shows a typical diode-like behaviour, with current and voltage of 0.115â¯ÂµA and 0.075â¯V for KNBF and 0.19â¯ÂµA and 0.035â¯V for KNLF, respectively. To our knowledge these represent the largest values among KNbO3-based ceramics, making them promising for photovoltaic applications.
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Physical Sciences and Engineering
Materials Science
Nanotechnology
Authors
Carolina Elicker, Cristina Pascual-González, Luciano T. Gularte, Mario L. Moreira, Sergio S. Cava, Antonio Feteira,