title: EPR, optical and infrared absorption studies of Mn2+ ions doped in zinc malate trihydrate single crystal.
abstract: Electron paramagnetic resonance (EPR) studies have been carried out on Mn2+ ions doped in zinc malate trihydrate single crystals in the temperature range 123-413 K on X-band frequency. The EPR spectrum at room temperature exhibits a group of five fine structure transitions each splits into six hyperfine components. Angular variation studies reveal that Mn2+ ions enter the lattice substitutionally. From the observed EPR spectrum, the spin-Hamiltonian parameters have been evaluated. The variation of zero-field splitting parameter (D) with temperature is measured. From the optical absorption spectrum, the crystal field splitting parameter Dq and the Racah interelectronic repulsion parameters B and C have been evaluated. The infrared spectrum exhibits bands characteristic of the carboxylic acid salts.
authors.affiliation: Department of Physics, Sri Venkateswara University, Tirupati 517502, India.
authors.forename: Ch Linga
authors.initials: ChL
authors.lastname: Raju
authors.forename: N O
authors.initials: NO
authors.lastname: Gopal
authors.forename: K V
authors.initials: KV
authors.lastname: Narasimhulu
authors.forename: J
authors.initials: J
authors.lastname: Lakshmana Rao
authors.forename: B C Venkata
authors.initials: BC
authors.lastname: Reddy
mesh_terms: D002413:Cations, Divalent / Q000737:chemistry*; D003460:Crystallization; D004578:Electron Spin Resonance Spectroscopy; D008293:Malates / Q000737:chemistry*; D008345:Manganese / Q000737:chemistry*; D013055:Spectrophotometry, Infrared; D013696:Temperature; D017967:Zinc Compounds / Q000737:chemistry*
chemical_list: D002413:Cations, Divalent; D008293:Malates; D017967:Zinc Compounds; D008345:Manganese