Preparation and characterization of rare earth orthoborates, LnBO{sub 3} (Ln = Tb, La, Pr, Nd, Sm, Eu, Gd, Dy, Y) and LaBO{sub 3}:Gd, Tb, Eu by metathesis reaction: ESR of LaBO{sub 3}:Gd and luminescence of LaBO{sub 3}:Tb, Eu

Journal Article · Mon Aug 15 00:00:00 EDT 2011 · Materials Research Bulletin

DOI:https://doi.org/10.1016/J.MATERRESBULL.2011.04.006· OSTI ID:22212217

Velchuri, Radha; Kumar, B. Vijaya; Devi, V. Rama ^[1]; Prasad, G. ^[2]; Prakash, D. Jaya ^[3]

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1. Department of Chemistry, Osmania University, Hyderabad 500007 (India)
2. Department of Physics, Osmania University, Hyderabad 500007 (India)
3. College of Technology, Osmania University, Hyderabad 500007 (India)

Highlights: {yields} Orthoborates and their solid solutions were prepared by metathesis reaction. {yields} NaCl (by-product) is the driving force for these metathesis reactions. {yields} Structural refinement for TbBO{sub 3} was carried out. {yields} Spin-Hamiltonian parameters of Gd{sup 3+} were deduced from the ESR spectra of LaBO{sub 3}:Gd. -- Abstract: Lanthanide orthoborates of composition LnBO{sub 3} (Ln = Tb, La, Pr, Nd, Sm, Eu, Gd, Dy, Y) and LaBO{sub 3}:Gd, Tb, Eu have been prepared by metathesis reaction. This method provides a convenient route for the synthesis of orthoborates and its solid solutions at low temperatures. Powder X-ray diffraction and FT-IR spectroscopy were used to characterize these borates. Rare earth borates, (LnBO{sub 3}) are isomorphous with different forms of CaCO{sub 3} depending on the radius of rare earth ion. LaBO{sub 3}, LaBO{sub 3}:Gd, Tb, Eu, PrBO{sub 3}, NdBO{sub 3} crystallized in aragonite structure, SmBO{sub 3} crystallized in H-form and TbBO{sub 3}, EuBO{sub 3}, GdBO{sub 3}, DyBO{sub 3}, YBO{sub 3} crystallized in vaterite structure. The structural analysis of TbBO{sub 3} was carried out. The morphology of these borates was obtained from Scanning electron microscopy. Spin-Hamiltonian parameters for Gd{sup 3+} are deduced from room temperature electron spin resonance spectrum of LaBO{sub 3}:Gd. The luminescence of LaBO{sub 3}:Tb, Eu gave characteristics peaks corresponding to Tb{sup 3+}, Eu{sup 3+} respectively.

• OSTI ID: 22212217
• Journal Information: Materials Research Bulletin, Vol. 46, Issue 8; Other Information: Copyright (c) 2011 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 0025-5408
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
36 MATERIALS SCIENCE
ABSORPTION SPECTROSCOPY
ARAGONITE
BORATES
CALCIUM CARBONATES
ELECTRON SPIN RESONANCE
EUROPIUM IONS
GADOLINIUM IONS
HAMILTONIANS
INFRARED SPECTRA
LUMINESCENCE
OPTICAL PROPERTIES
RARE EARTHS
SCANNING ELECTRON MICROSCOPY
SOLID SOLUTIONS
SPIN
SYNTHESIS
TERBIUM IONS
X-RAY DIFFRACTION