Effect of Pr doping on the optical and magnetic properties of calcium stannate perovskite nanostructures
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Effect of Pr doping on the optical and magnetic properties of calcium stannate perovskite nanostructures Avinash Manoharan1 · Muralidharan Munusamy1 · Ajaykumari Pradeep1 · Selvakumar Sellaiyan2 · Shamima Hussain3 · Sivaji Krishnan1 Received: 18 July 2020 / Accepted: 6 October 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Pristine and Pr-doped CaSnO3 (CSO) nanostructures prepared by the chemical precipitation method are studied for optical and magnetic properties. Structural studies with lattice parameter variation and defect-related parameters arising on the effect of Pr ions are being investigated. Morphological changes from the doping concentration are described. Luminescence characteristics and bandgap variation are calculated from the optical properties. The presence of free radicals and anisotropic spin resonance centers are presented from EPR spectra. The magnetization behavior of pristine and Pr-doped CSO is explained through the defects and its related interaction with the host sites. Keywords Orthorhombic · Vacancy · F-center interaction
1 Introduction Perovskite-structured materials have revitalized academic and industrial interest among the researchers for the past few decades [1]. In particular, stannates have attracted industrial usage due to many applications [2, 3]. Predicting the origin of magnetic behavior in these perovskite systems is challenging due to multiple theoretical models that compete to open up a clear understanding. An endurable magnetic behavior, along with high Curie temperature (Tc), is a demand for most of the practical devices. Reports suggest that, in ABO3 (A = Ca/Ba and B = Sn/Sr, etc.) systems, point defects arising from cationic and anionic compositions can significantly change the physical and chemical properties [4, 5]. Among these, oxygen vacancies are prominent point defects reported by various research groups [6]. Doping, by atomic substitution, induces point defects that alters the physical properties of a material. If achieved under * Sivaji Krishnan [email protected] 1
Department of Nuclear Physics, University of Madras, Guindy Campus, Chennai 600025, India
2
Division of Applied Physics, University of Tsukuba, Tsukuba, Ibaraki 305‑8573, Japan
3
UGC-DAE Consortium for Scientific Research, Kalpakkam Node, Kokilamedu 603104, India
controlled conditions, perovskite systems can be explored in spintronics [7]. Moreover, strong control over nanostructures synthesis is very important for the application perspective. Salavati-Nisari et al. [8–14] have extensively worked on the synthesis of different types of metal oxides by adopting various preparation strategies and achieved significant results. Davar et al. [15, 16] reported on the synthesis of spinel-type zinc aluminate nanoparticles and stated that the choice of proper solvent played a crucial in the nanoparticles formation mechanism. Esmaeili et al. [17] have prepared magnetic nanostructures by thermal decomposition method and stated that the formation of precursor materia
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