X-ray photoelectron spectroscopy was used to study the chemical composition and valence states of the metal ions in vanadium-yttrium. hydrate. The binding energies, FWHM and shape of the main XPS peaks were analyzed. The concentration ratio of tetra- and pentavalent vanadium ions C=V4+ /(V4+ +V5+), which is an important parameter, deciding the electronic part of total conductivity, was determined before (C=0.14) and after heating at 720 K (C=0.28). (C) 2001 Elsevier Science BY All rights reserved.
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Univ Autonoma Nuevo Leon UANL, Fac Ingn Mecan & Elect FIME, San Nicolas De los Garza 66450, MexicoUniv Autonoma Nuevo Leon UANL, Fac Ingn Mecan & Elect FIME, San Nicolas De los Garza 66450, Mexico
Sanchez-Zambrano, Karla Sofia
Hernandez-Resendiz, Marina
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Univ Autonoma Nuevo Leon UANL, Fac Ingn Mecan & Elect FIME, San Nicolas De los Garza 66450, MexicoUniv Autonoma Nuevo Leon UANL, Fac Ingn Mecan & Elect FIME, San Nicolas De los Garza 66450, Mexico
Hernandez-Resendiz, Marina
Gomez-Rodriguez, Cristian
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Univ Veracruz, Fac Engn, Coatzacoalcos 96535, Mexico
Univ Oviedo, Dept Ciencia los Mat & Ingn Met, Escuela Minas Energia & Mat, Oviedo 33004, SpainUniv Autonoma Nuevo Leon UANL, Fac Ingn Mecan & Elect FIME, San Nicolas De los Garza 66450, Mexico
Gomez-Rodriguez, Cristian
Garcia-Quinonez, Linda Viviana
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CONACYT, Unidad Monterrey, Ctr Invest Cient Educ Super Ensenada BC, CICESE, Apodaca 66629, MexicoUniv Autonoma Nuevo Leon UANL, Fac Ingn Mecan & Elect FIME, San Nicolas De los Garza 66450, Mexico
Garcia-Quinonez, Linda Viviana
Aguilar-Martinez, Josue Amilcar
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Aguilar-Martinez, Josue Amilcar
Rodriguez-Castellanos, Eden Amaral
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Univ Autonoma Nuevo Leon UANL, Fac Ingn Mecan & Elect FIME, San Nicolas De los Garza 66450, MexicoUniv Autonoma Nuevo Leon UANL, Fac Ingn Mecan & Elect FIME, San Nicolas De los Garza 66450, Mexico
Rodriguez-Castellanos, Eden Amaral
Verdeja, Luis Felipe
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Univ Autonoma Nuevo Leon UANL, Fac Ingn Mecan & Elect FIME, San Nicolas De los Garza 66450, Mexico
Univ Oviedo, Dept Ciencia los Mat & Ingn Met, Escuela Minas Energia & Mat, Oviedo 33004, SpainUniv Autonoma Nuevo Leon UANL, Fac Ingn Mecan & Elect FIME, San Nicolas De los Garza 66450, Mexico
Verdeja, Luis Felipe
Fernandez-Gonzalez, Daniel
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Univ Oviedo UO, Consejo Super Invest Cient CSIC, Principado Asturias PA, Ctr Invest Nanomateri Nanotecnol CINN, Avda Vega,4-6, Asturias 33940, SpainUniv Autonoma Nuevo Leon UANL, Fac Ingn Mecan & Elect FIME, San Nicolas De los Garza 66450, Mexico
Fernandez-Gonzalez, Daniel
Castillo-Rodriguez, Guadalupe Alan
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Univ Autonoma Nuevo Leon UANL, Fac Ingn Mecan & Elect FIME, San Nicolas De los Garza 66450, MexicoUniv Autonoma Nuevo Leon UANL, Fac Ingn Mecan & Elect FIME, San Nicolas De los Garza 66450, Mexico