X-ray photoelectron spectroscopy for La1-xCaxMnO3 (x=0.10, 0.15, 0.20)

作者：Zhang Hongguang^*; Bian Yongsong; Ma Xiaochen; Zheng Weihan; Li Yongtao; Liu Shengli; Bao Gang

来源：Journal of the Chinese Ceramic Society, 2014, 42(7): 857-861.

DOI：10.7521/j.issn.0454-5648.2014.07.08

• Calcium doping
• Colossal magnetoresistence
• Configuration interactions
• Coulombic repulsion
• Crystal-field splitting
• Lanthanum manganate
• Low doping concentrations
• Orthorhombic crystal structures

The La1-xCaxMnO3 (x=0.10, 0.15, 0.20) was prepared by a sol-gel method. The samples were characterized by X-ray diffraction and X-ray photoelectron spectroscopy. According to the results by XRD, these samples are awell-single phase with the Pbnm orthorhombic crystal structure. From the XPS spectra of Mn 2p, La 4 d, O 1 s core levels, there is little chemical shift for La and O ions, but a slight change for Mn ions at a low doping concentration. The Mn 2p core level was also calculated by a configuration interaction cluster model. The parameters are crystal field splitting energy (10Dq) of 1.0 eV, charge transfer (Δ) of 5 eV, dd Coulombic repulsion potential (Udd) of 4 eV, pd Coulombic repulsion potential (Upd) of 4.4 eV, and energy of transitional metal d orbital hybridized with ligand oxygen orbital (T(eg)) of 3.8 eV, respectively.

• 出版日期2014
• 单位南京邮电大学