Optical and electromagnetic properties of LaCo[O.sub.3]:[Li.sup.+];[M.sup.2+]
Lanthanum cobaltates modified by alkaline-earth-metal (0.10 mol%) and lithium (0.05 mol%) ions were synthesized. The samples had an orthorhombic distorted perovskite-like structure according to x-ray diffraction phase analysis. Addition of [Li.sup.+] and [M.sup.2+] (M = Ca, Sr, Ba) to the LaCo[O.sub...
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| Veröffentlicht in: | Journal of applied spectroscopy 2014-09, Vol.81 (4), p.624 |
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| creator | Fesich, I.V Trachevsky, V.V Dziazko, A.G Nedilko, S.A Melnikc, A.K |
| description | Lanthanum cobaltates modified by alkaline-earth-metal (0.10 mol%) and lithium (0.05 mol%) ions were synthesized. The samples had an orthorhombic distorted perovskite-like structure according to x-ray diffraction phase analysis. Addition of [Li.sup.+] and [M.sup.2+] (M = Ca, Sr, Ba) to the LaCo[O.sub.3] matrix was shown to increase the unit-cell parameters, the optical band width (Eg), and the average Co oxidation state ([Co.sup.n+]). Pure and doped LaCo[O.sub.3] were characterized by the presence of paramagnetic centers as isolated structural and surface [Co.sup.2+] ions and adsorption complexes [[Co.sup.3+] ... [O.sup.-.sub.2]] * on the surface of the oxide matrix at a concentration that increased in the order Ba > Sr > Ca. The cobaltates were found to possess Mott hopping conduction in the temperature range 77-298 K. |
| format | Article |
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The samples had an orthorhombic distorted perovskite-like structure according to x-ray diffraction phase analysis. Addition of [Li.sup.+] and [M.sup.2+] (M = Ca, Sr, Ba) to the LaCo[O.sub.3] matrix was shown to increase the unit-cell parameters, the optical band width (Eg), and the average Co oxidation state ([Co.sup.n+]). Pure and doped LaCo[O.sub.3] were characterized by the presence of paramagnetic centers as isolated structural and surface [Co.sup.2+] ions and adsorption complexes [[Co.sup.3+] ... [O.sup.-.sub.2]] * on the surface of the oxide matrix at a concentration that increased in the order Ba > Sr > Ca. 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The samples had an orthorhombic distorted perovskite-like structure according to x-ray diffraction phase analysis. Addition of [Li.sup.+] and [M.sup.2+] (M = Ca, Sr, Ba) to the LaCo[O.sub.3] matrix was shown to increase the unit-cell parameters, the optical band width (Eg), and the average Co oxidation state ([Co.sup.n+]). Pure and doped LaCo[O.sub.3] were characterized by the presence of paramagnetic centers as isolated structural and surface [Co.sup.2+] ions and adsorption complexes [[Co.sup.3+] ... [O.sup.-.sub.2]] * on the surface of the oxide matrix at a concentration that increased in the order Ba > Sr > Ca. 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The samples had an orthorhombic distorted perovskite-like structure according to x-ray diffraction phase analysis. Addition of [Li.sup.+] and [M.sup.2+] (M = Ca, Sr, Ba) to the LaCo[O.sub.3] matrix was shown to increase the unit-cell parameters, the optical band width (Eg), and the average Co oxidation state ([Co.sup.n+]). Pure and doped LaCo[O.sub.3] were characterized by the presence of paramagnetic centers as isolated structural and surface [Co.sup.2+] ions and adsorption complexes [[Co.sup.3+] ... [O.sup.-.sub.2]] * on the surface of the oxide matrix at a concentration that increased in the order Ba > Sr > Ca. The cobaltates were found to possess Mott hopping conduction in the temperature range 77-298 K.</abstract><pub>Springer</pub><tpages>9</tpages></addata></record> |
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| ispartof | Journal of applied spectroscopy, 2014-09, Vol.81 (4), p.624 |
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| subjects | Adsorption Analysis Diffraction Perovskite X-rays |
| title | Optical and electromagnetic properties of LaCo[O.sub.3]:[Li.sup.+];[M.sup.2+] |
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