title: Low temperature preparation and characterization of In1-xLnxBO3 (x=0.0 and 0.05; Ln=Gd, Eu, Dy and Sm): ESR of In0.95Gd0.05BO3 and emission of In0.95Eu0.05BO3.
abstract: Indium borate and rare earth substituted indium borates (In(1-x)Ln(x)BO(3) (x=0.0 and 0.05; Ln=Gd, Eu, Dy and Sm)) are prepared at low temperature by metathesis reaction using InCl(3), LnCl(3) and NaBO(2). They are characterized by powder XRD and infrared spectroscopy. All the compositions (In(1-x)Ln(x)BO(3)) crystallize in hexagonal lattice with calcite structure. These borates gave characteristic IR vibrations of planar BO(3) group. Spin-Hamiltonian parameters for Gd(3+) are deduced from room temperature electron spin resonance spectrum of In(0.95)Gd(0.05)BO(3). The electron spin resonance spectrum of In(0.95)Gd(0.05)BO(3) gave several anisotropic lines with g>2.0. The ESR spectrum of the sample belongs to the "intermediate" category with 1/4<H(CF)/hnu<1. The local symmetry of Eu(3+) in In(0.95)Eu(0.05)BO(3) is obtained from its emission spectrum. The R/O ratio of In(0.95)Eu(0.05)BO(3) suggests the occupation of In(3+) site by Eu(3+) with near symmetric octahedral geometry.
authors.affiliation: Department of Chemistry, Osmania University, Hyderabad 500007, Andhra Pradesh, India. muga vithal@yahoo.com
authors.forename: Radha
authors.initials: R
authors.lastname: Velchuri
authors.forename: B
authors.initials: B
authors.lastname: Vijaya Kumar
authors.forename: V
authors.initials: V
authors.lastname: Rama Devi
authors.forename: K
authors.initials: K
authors.lastname: Ravi Kumar
authors.forename: G
authors.initials: G
authors.lastname: Prasad
authors.forename: M
authors.initials: M
authors.lastname: Vithal
mesh_terms: D001881:Borates / Q000032:analysis*; D003080:Cold Temperature; D008674:Metals, Rare Earth / Q000032:analysis*; D013055:Spectrophotometry, Infrared; D014961:X-Ray Diffraction
chemical_list: D001881:Borates; D008674:Metals, Rare Earth