6533b821fe1ef96bd127c492

RESEARCH PRODUCT

Oxygen K-edge XANES investigation of NicMg1−cO solid solutions

Nina Mironova-ulmaneZiyu WuAugosto MarcelliAlexei KuzminDongliang ChenXiang WuJun Zhong

subject

ChemistrySpectrum AnalysisDrop (liquid)Analytical chemistrychemistry.chemical_elementSodium ChlorideOxygenAtomic and Molecular Physics and OpticsXANESAnalytical ChemistryDilutionOxygenSolutionsX-Ray DiffractionK-edgeNickelMagnesiumSpectroscopyInstrumentationMagnesium ionSpectroscopySolid solution

description

A series of Ni(c)Mg(1-c)O solid solutions are characterized by means of synchrotron radiation X-ray diffraction and X-ray absorption near-edge-structure spectroscopy at oxygen K-edge (532 eV). A dramatic drop of the pre-edge peak intensity is observed in the Ni(c)Mg(1-c)O system upon dilution. It can be attributed to a decrease of 3d(8)(Ni(2+))-2p(O(2-)) mixing upon dilution with magnesium ions due to a decrease of the number of 3d vacancies as nickel ion is replaced by magnesium ion. Similarly, the decrease of the number of 4s and 4p vacancies also leads to a decrease of 4s4p(Ni(2+))-2p(O(2-)) hybridization, and hence a drop of intensities of features B and C. The features E and F are more sensitive to the increase of the degree of disorder upon dilution than feature D, revealing that the latter is mainly dependent by the medium-range order.

yearjournalcountryeditionlanguage
2005-11-25Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy
https://doi.org/10.1016/j.saa.2007.11.032