title: Investigations on local structures in new Bi2-2xLa2xUO6 (x = 0-0.05) solid solutions: a combined XRD, EXAFS, PL and EPR study.
abstract: La doped Bi2UO6 solid solutions of the general formula Bi2-2xLa2xUO6 (x = 0-0.05) were prepared by the solid state reaction of Bi2O3, La(OH)3 and U3O8 in a stoichiometric ratio. These solid solutions were characterized by X-ray diffraction, Extended X-ray Absorption Fine Structure (EXAFS) and X-ray Absorption Near Edge Spectroscopy (XANES) studies. It was found that La goes to the Bi sites of the Bi2UO6 lattice during the formation of these solid solutions. For further confirmation, a photoluminescence (PL) study on an iso-structural Bi1.96Eu0.04UO6 was performed, and this supports the above observation. The solid solutions were also probed by EPR studies. The PL and EPR studies suggest that there are doping induced oxygen vacancies in these solid solutions.
authors.affiliation: Fuel Chemistry Division, Bhabha Atomic Research Centre, Mumbai 400 085, India. nlmisra@barc.gov.in nlmisra@yahoo.com and Homi Bhabha National Institute, Anushakti Nagar, Mumbai 400094, India.
authors.forename: Kaushik
authors.initials: K
authors.lastname: Sanyal
authors.affiliation: Radiochemistry Division, Bhabha Atomic Research Centre, Mumbai 400 085, India and Homi Bhabha National Institute, Anushakti Nagar, Mumbai 400094, India.
authors.forename: Nimai
authors.initials: N
authors.lastname: Pathak
authors.affiliation: Atomic and Molecular Physics Division, Bhabha Atomic Research Centre, Mumbai 400 085, India and Homi Bhabha National Institute, Anushakti Nagar, Mumbai 400094, India.
authors.forename: Ashok Kumar
authors.initials: AK
authors.lastname: Yadav
authors.affiliation: Fuel Chemistry Division, Bhabha Atomic Research Centre, Mumbai 400 085, India. nlmisra@barc.gov.in nlmisra@yahoo.com and Homi Bhabha National Institute, Anushakti Nagar, Mumbai 400094, India.
authors.forename: Buddhadev
authors.initials: B
authors.lastname: Kanrar
authors.affiliation: Radiochemistry Division, Bhabha Atomic Research Centre, Mumbai 400 085, India and Homi Bhabha National Institute, Anushakti Nagar, Mumbai 400094, India.
authors.forename: Ramakant Mahadeo
authors.initials: RM
authors.lastname: Kadam
authors.affiliation: Atomic and Molecular Physics Division, Bhabha Atomic Research Centre, Mumbai 400 085, India.
authors.forename: Shambhu Nath
authors.initials: SN
authors.lastname: Jha
authors.affiliation: Atomic and Molecular Physics Division, Bhabha Atomic Research Centre, Mumbai 400 085, India and Homi Bhabha National Institute, Anushakti Nagar, Mumbai 400094, India.
authors.forename: Dibyendu
authors.initials: D
authors.lastname: Bhattacharya
authors.affiliation: Fuel Chemistry Division, Bhabha Atomic Research Centre, Mumbai 400 085, India. nlmisra@barc.gov.in nlmisra@yahoo.com and Homi Bhabha National Institute, Anushakti Nagar, Mumbai 400094, India.
authors.forename: N L
authors.initials: NL
authors.lastname: Misra