Bandgap tuning in SrTi(N,O,F)3 by anionic-lattice variation

Yoon, Songhak; Maegli, Alexandra E.; Karvonen, Lasse; Matam, Santhosh Kumar; Shkabko, Andrey; Riegg, Stefan; Großmann, Thomas; Ebbinghaus, Stefan G.; Pokrant, Simone; Weidenkaff, Anke

doi:10.1016/j.jssc.2013.08.001

Cited by 36 publications

(10 citation statements)

References 53 publications

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“…The observed energy difference was around 6 eV which corresponds to spin orbit splitting of Ti 4? species [37,38]. In addition, Cr doped SrTiO 3 shows the shift in binding energy towards lower edge (6.15 eV).…”

Section: Xps Studiesmentioning

confidence: 93%

Carrier mediated ferromagnetism in Cr doped SrTiO3 compounds

Muralidharan

Anbarasu

Perumal

et al. 2015

J Mater Sci: Mater Electron

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The carrier doped ferromagnetism in SrTiO 3 compounds has been investigated for the importance in the field of multiferroics and spintronics. Polycrystalline pure and Cr doped SrTiO 3 compounds were synthesized by glycol assisted sol-gel method. Powder X-ray diffraction (XRD) studies reveal the simple cubic perovskite structure of all the prepared compounds. The grain size and lattice strain of the compounds were estimated from the powder XRD pattern which evidences the incorporation of Cr in SrTiO 3 system. The local order and disorder parameter of the compounds was investigated by laser Raman spectroscopy. The change in particles to rod like surface morphology while increasing Cr doping concentration was examined by scanning electron microscope and transmission electron microscopy. The enhancement of oxygen vacancy while increasing Cr doping concentration in SrTiO 3 system and reduction in Ti 4? to Ti 3? states was identified by X-ray photoelectron spectroscopy. The UVVis absorption spectra evidence the distinctive shift of absorption edge exclusively for Cr doped SrTiO 3 compounds. Photoluminescence (PL) spectra of the compounds reveal defective states and decrease in PL intensity due to the influence of Cr in SrTiO 3 . Electron paramagnetic resonance analysis of Cr doped compounds reveals the paramagnetic nature of the dopants. The magnetization studies of all the prepared compounds emphasis carrier mediated diamagnetic to ferromagnetic phase transition in due with the presence of carriers induced by Cr. It is also evident that the highest dopant concentration of Cr in SrTiO 3 system exhibits reversal ferromagnetism. The enhancement of magnetization and ferromagnetic ordering has been understood in terms of carrier-mediated Ruderman-KittelKasuya-Yosida interaction theory. The present work also demonstrates the influence of surface morphology on the occurrence of ferromagnetism in Cr doped SrTiO 3 compounds.

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Section: Xps Studiesmentioning

confidence: 93%

Carrier mediated ferromagnetism in Cr doped SrTiO3 compounds

Muralidharan

Anbarasu

Perumal

et al. 2015

J Mater Sci: Mater Electron

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“…Several combinations of A-and B-site cations can form a stable perovskite-like structure. Additionally, A-and B-site cations, as well as oxygen anions can be partially substituted by other suitable elements [17,18]. Partial substitution allows the control of the valence state of A-and B-site cations as well as the non-stoichiometry (cationic or anionic vacancies) in the mixed oxide based on electroneutrality arguments.…”

Section: Perovskite-type Oxidesmentioning

confidence: 99%

Structured Perovskite-Based Catalysts and Their Application as Three-Way Catalytic Converters—A Review

et al. 2014

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Automotive Three-Way Catalysts (TWC) were introduced more than 40 years ago. Despite that, the development of a sustainable TWC still remains a critical research topic owing to the increasingly stringent emission regulations together with the price and scarcity of precious metals. Among other material classes, perovskite-type oxides are known to be valuable alternatives to conventionally used TWC compositions and have demonstrated to be suitable for a wide range of automotive applications, ranging from TWC to Diesel Oxidation Catalysts (DOC), from NO x Storage Reduction catalysts (NSR) to soot combustion catalysts. The interest in these catalysts has been revitalized in the past ten years by the introduction of the concept of catalyst regenerability of perovskite-based TWC, which is in principle well applicable to other catalytic processes as well, and by the possibility to reduce the amounts of critical elements, such as precious metals without seriously lowering the catalytic performance. The aim of this review is to show that perovskite-type oxides have the potential to fulfil the requirements (high activity, stability, and possibility to be included into structured catalysts) for implementation in TWC.

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“…This is because they are not expected to induce trapping levels in the band gap. In fact, the incorporation of N impurities has been shown to enhance visible-light absorption [9,10] and improve the photocatalytic activity [11][12][13][14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Energetics and optical properties of nitrogen impurities in SrTiO3 from hybrid density-functional calculations

et al. 2017

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Semiconductor photocatalysts that can produce hydrogen from water splitting are of great interest. Among the various possibilities, nitrogen (N)-doped SrTiO 3 is a promising candidate for hydrogen evolution under visible-light irradiation. In this study, hybrid density-functional calculations are employed to investigate the stability and impact of nitrogen impurities on the electronic and optical properties in SrTiO 3. We find that the substitutional N on O site (N O) is a deep acceptor in SrTiO 3. Moreover, N O predominates over other N-related defects under equilibrium growth conditions in n-type SrTiO 3. Our results reveal that N O gives rise to visible-light absorption in agreement with experimental observations. In addition, we find that hydrogen can bind to N O , forming N O-H i complex which leads to a blueshift in the optical absorption. Other N configurations can also contribute to optical absorption in the visible range. The vibration frequencies of different N configurations are provided to support identification using vibrational spectroscopy techniques.

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Bandgap tuning in SrTi(N,O,F)3 by anionic-lattice variation

Cited by 36 publications

References 53 publications

Carrier mediated ferromagnetism in Cr doped SrTiO3 compounds

Carrier mediated ferromagnetism in Cr doped SrTiO3 compounds

Structured Perovskite-Based Catalysts and Their Application as Three-Way Catalytic Converters—A Review

Energetics and optical properties of nitrogen impurities in SrTiO3 from hybrid density-functional calculations

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