X 10 X-ray emission and photoelectron spectra of Pr0.5Sr0.5MnO3 [] / E. Z. Kurmaev, M. A. Korotin, V. R. Galakhov, L. D. Finkelstein, E. I. Zabolotzky, N. N. Efremova, N. I. Lobachevskaya, S. Stadler, D. L. Ederer, T. A. Callcott // Physical Review B. - 1999. - V. 59, N 20. - С. 12799-12806 . - ISSN 0163-1829 Рубрики: ХИМИЧЕСКИЕ НАУКИ Кл.слова (ненормированные): ПРАЗЕОДИМ -- СТРОНЦИЙ -- МАРГАНЕЦ -- МАНГАНИТЫ -- Pr -- Sr -- Mn -- ЭМИССИЯ РЕНТГЕНОВСКАЯ -- РЕНТГЕНОВСКАЯ ЭМИССИЯ -- СПЕКТРОСКОПИЯ ФОТОЭЛЕКТРОННАЯ -- ФОТОЭЛЕКТРОННАЯ СПЕКТРОСКОПИЯ |
V 18 Valence band spectra and electronic structure of manganites and related oxides [] / N. A. Ovechkina, V. R. Galakhov, M. Demeter, M. Neumann, N. I. Lobachevskaya, L. V. Elokhina, E. Z. Kurmaev // Conference on Advanced Magneto-Resistive Materials (March 4-7, 2001): Abstr. - 2001. - С. 2-31 Рубрики: ХИМИЧЕСКИЕ НАУКИ Кл.слова (ненормированные): ЭЛЕКТРОННАЯ СТРУКТУРА -- СТРУКТУРА ЭЛЕКТРОННАЯ -- МАНГАНИТЫ -- ОКСИДЫ -- РЕНТГЕНОФОТОЭЛЕКТРОННАЯ СПЕКТРОСКОПИЯ -- СПЕКТРОСКОПИЯ РЕНТГЕНОФОТОЭЛЕКТРОННАЯ -- РЕНТГЕНОЭМИССИОННАЯ СПЕКТРОСКОПИЯ -- СПЕКТРОСКОПИЯ РЕНТГЕНОЭМИССИОННАЯ -- ВАЛЕНТНОСТЬ -- LaMnO3 -- КРИСТАЛЛЫ -- КЕРАМИКА -- НЕСТЕХИОМЕТРИЯ -- LiMnO2 |
A 53 An investigation of the effect of the nearest surroundings on the formation of VLa emission bands for solid solutions of rare earth orthovanadates-orthophosphates [Text] / V. R. Galakhov, V. M. Cherkashenko, M. Ya. Hodos, S. N. Nemnonov, E. V. Kuznetsov, E. Z. Kurmaev, V. A. Gubanov // Journal of Electron Spectroscopy and Related Phenomena. - 1985. - V.35, N 1-2. - P87-99 . - ISSN 0368-2048 Рубрики: ХИМИЧЕСКИЕ НАУКИ Кл.слова (ненормированные): ХИМИЯ -- РАСТВОРЫ ТВЕРДЫЕ -- ТВЕРДЫЕ РАСТВОРЫ -- РЕДКОЗЕМЕЛЬНЫЕ ЭЛЕМЕНТЫ -- РЗЭ -- ЭЛЕМЕНТЫ РЕДКОЗЕМЕЛЬНЫЕ -- ОРТОВАНАДАТЫ -- ОРТОФОСФАТЫ -- СВЯЗИ ХИМИЧЕСКИЕ -- ХИМИЧЕСКИЕ СВЯЗИ |
S 46 Semiconductor-metal transition in defect lithium cobaltite [Текст] / D. G. Kellerman, V. R. Galakhov, A. S. Semenova, Ya. N. Blinovskov, O. N. Leonidova // Physics of the Solid State. - 2006. - Vol. 48, № 3. - С. 548-556. - Библиогр. : с. 555 (36 назв.) Рубрики: ХИМИЧЕСКИЕ НАУКИ Кл.слова (ненормированные): ПЕРЕХОД ПОЛУПРОВОДНИК - МЕТАЛЛ -- КОБАЛЬТИТ ЛИТИЯ Аннотация: The magnetic susceptibility, electrical conductivity, and x-ray photoelectron and x-ray absorption spectra of defect lithium cobaltites of the general formula Li1−xCoO2 are investigated. It is found that, for lithium cobaltites with x> 0.25, the magnetic susceptibility increases abruptly and the conductivity type changes at T~ 150 K. The assumption is made that the semiconductor–metal transition in defect lithium cobaltite is caused by the increase in the diffusion mobility of lithium ions with an increase in the temperature when there is a correlation between spatial distributions of lithium vacancies and “electron” holes Полный текст |
E 43 Electronic structure and x-ray spectra of defective oxides LixCoO2 / V. R. Galakhov [et al.] // Physical Review B. - 2006. - Vol. 74, № 4. - P.045120(1-6) : il. - Bibliogr. : p. 045120(5-6) (26 ref.) Рубрики: ХИМИЧЕСКИЕ НАУКИ Кл.слова (ненормированные): СТРУКТУРА ЭЛЕКТРОННАЯ -- СПЕКТРЫ РЕНТГЕНОВСКИЕ -- ОКСИДЫ -- LiCoO2 Аннотация: X-ray absorption, resonant x-ray emission, and x-ray photoelectron spectra of the valence band and core levels have been measured for LixCoO2 (0.6<=x<=1.0,. Resonant O K(alfa) x-ray emission spectra of LiCoO2,,showed localized excitonic states due to a dd transition between unoccupied and occupied Co 3d states. On the basis of measurements of Co 3s x-ray photoelectron and Co 2p and O 1s x-ray absorption spectra it was established that in defective cobaltites the electronic holes are localized mainly in O 2p states. Evidence of phase separation in LixCoO2 has been found Полный текст |
G 15 Galakhov, V. R. Electronic structure of defective lithium cobaltites LixCoO2 / V. R. Galakhov, M. Neumann, D. G. Kellerman // Applied Physics A. - 2009. - Vol. 94. - P.497-500 : il. - Bibliogr. : p. 500 (18 ref.) Рубрики: ХИМИЧЕСКИЕ НАУКИ Кл.слова (ненормированные): КОБАЛЬТИТ ЛИТИЯ -- СТРУКТУРА ЭЛЕКТРОННАЯ -- РЕНТГЕНОВСКИЕ ЭМИССИОННЫЕ СПЕКТРЫ Аннотация: X-ray absorption, resonant X-ray emission, and??X-ray photoelectron spectroscopical methods have been applied for the study of the electronic structure of defective lithium cobaltites LixCoO2 (0.6 . x . 1.0). Resonant O K alfa X-ray emission spectra of LiCoO2 showed localized excitonic??states due to a dd transition between occupied and??unoccupied Co 3d states. On the base of measurements of Co 3s X-ray photoelectron, Co 2p, and O 1s X-ray absorption spectra, it was established that in defective cobaltites??the electronic holes are localized mainly in O 2p states. An evidence of phase separation in LixCoO2 has been found. It was shown that the semiconductor-to-metal transition in LixCoO2 (x <0.76) at about 160 K is not accompanied by??changes in the Co 3d electronic configuration which remains 3d6 \\\\Expert2\\nbo\\Applied Physics A Materials Science and Processing\\2009, v. 94, N 3, p. 497-500.pdf |
V 18 Valence States of 3d Ions in Lanthanum Manganites–Cobaltites, Determined by X-Ray Spectroscopy / V. R. Galakhov, M. A. Melkozerova, T. I. Chupakhina, G. V. Bazuev, M. Raekers, M. Neumann, S. L. Molodtsov // Bulletin of the Russian Academy of Sciences: Physics. - 2008. - Vol. 72, № 10. - P. 1403-1405 : il. - Bibliogr. : p. 1405 (12 ref.) Рубрики: ХИМИЧЕСКИЕ НАУКИ Кл.слова (ненормированные): МАНГАНИТЫ -- КОБАЛЬТИТЫ -- ЛАНТАН Аннотация: The valence states of manganese and cobalt ions in lanthanum manganites–cobaltites La1−xCaxMn0.5Co0.5O3 have been determined by 2p X-ray absorption and 3s X-ray photoelectron spectroscopies. The nanostructured P1 manganite–cobaltite phase with the concentration x= 0, obtained by the citrate method at a temperature of 700°C, is characterized by a valence state of cobalt ions close to 2+ and a valence state of Mn ions of about 3.5+. The P2 phase at the same calcium concentration, synthesized by the high-temperature solid-phase method at a temperature of 1300°C , is characterized by a manganese valence of 3.5+ and a cobalt valence of about 2.3+. An increase in the dopant concentration leads to an increase in the average valence of 3d ions \\\\Expert2\\nbo\\Bulletin of the Russian Academy of Sciences Physics\\2008, V. 72, N 10, P.1403-1405.pdf |
E 43 Electronic Structure, X-ray Spectra, and Magnetic Properties of the LiCoO2 –beta and NaxCoO2 Nonstoichiometric Oxides / V. R. Galakhov, V. V. Karelina, D. G. Kellerman, V. S. Gorshkov, N. A. Ovechkina, M. Neumann // Physics of the Solid State. - 2002. - Vol. 44, № 2. - P266-273 : il. - Bibliogr. : p. 273 (22 ref.) Рубрики: ХИМИЧЕСКИЕ НАУКИ Кл.слова (ненормированные): НЕСТЕХИОМЕТРИЯ -- МАГНИТНАЯ ВОСПРИИМЧИВОСТЬ -- ОКСИД КОБАЛЬТА Аннотация: This paper reports on a study of the magnetic susceptibility, x-ray photoelectron, and x-ray emission spectra of the LiCoO2 –beta and NaxCoO2 nonstoichiometric oxides. The valence-band structure of LiCoO2 was analyzed. The hole concentration in the oxygen 2p band of LiNiO2 and LiCoO2 was derived from measurements of the O K alfa emission spectra. Measurements of Co 2p and Co 3s photoelectron spectra showed that the Co3+ ions reside in the low-spin state with S = 0. The deficiency of oxygen in the LiCoO2 –delta reduced oxides gives rise to the formation of divalent cobalt ions. The deficiency of the alkali metal in NaxCoO2 initiates the formation of holes in the oxygen 2p band while not changing the electronic configuration d6 of the cobalt-ion ground state Полный текст |
S 98 Synthesis, Crystal and Electronic Structures, and Thermodynamic Characteristics of BaCe1 – xInxO3 – x/2 Solid Solutions / T. I. Chupakhina, N. I. Matskevich, G. V. Bazuev, N. A. Ovechkina, V. R. Galakhov, M. Raeckers, M. Neumann // Russian Journal of Inorganic Chemistry. - 2010. - Vol. 55, № 7. - P1002-1009 : il. - Bibliogr. : p. 1008-1009 (37 ref.) Рубрики: ХИМИЧЕСКИЕ НАУКИ Кл.слова (ненормированные): ПЕРОВСКИТЫ -- ТВЕРДЫЕ РАСТВОРЫ -- ОКСИД ЦЕРИЯ Аннотация: New perovskite oxide phases BaCe1 – xInxO3 – x/2 (x = 0.1–0.8) (space group Pbnm) have been synthesized. The unit cell volume of the resulting solid solutions monotonically decreases with an increase in the degree of substitution of indium for cerium due to the contraction of octahedra in perovskite blocks. The thermodynamic stability of the compound BaCe0.75In0.25O2.875 was studied by the solution calorimetry method, and barium cerates were shown to be thermodynamically stable with respect to binary oxides at room temperature. The structure of occupied and vacant states in BaCe1 – xInxO3 – x/2 was determined on the basis of X ray emission, absorption, and photoelectron spectra, and the energy gap was estimated at ~2 eV Полный текст |
E 43 Electronic structure of LiMnO2: X-ray emission and photoelectron spectra and band structure calculations / V. R. Galakhov, M. A. Korotin, N. A. Ovechkina, E. Z. Kurmaev, V. S. Gorshkov, D. G. Kellerman, S. Bartkowski, M. Neumann // European Physical Journal B: Condensed Matter Physics. - 2000. - Vol. 14. - P281-286 : il. - Bibliogr. : p. 286 (27 ref.) Рубрики: ХИМИЧЕСКИЕ НАУКИ Кл.слова (ненормированные): МАНГАНИТ ЛИТИЯ -- РЕНТГЕНОВСКАЯ ФОТОЭЛЕКТРОННАЯ СПЕКТРОСКОПИЯ -- ФЛУОРЕСЦЕНЦИЯ Аннотация: The electronic structure of LiMnO2 and Li2MnO3 was studied by means of X-ray photoelectron and soft X-ray emission spectroscopy. For LiMnO2, LSDA and LSDA+U calculations were carried out. The LSDA+U calculations are in rather good agreement with the measured valence-band structure as well as with the magnetic and electrical properties of LiMnO2. It is shown that the band gap in LiMnO2 is determined by the charge-transfer effect Полный текст |