Valence State of Pb in Transition Metal Perovskites PbTMO3 (TM = Ti, Ni) Determined From X-Ray Absorption Near-Edge Spectroscopy

Kai Chen, Yimin Mijiti, Stefano Agrestini, Sheng Chieh Liao, Xiang Li, Jianshi Zhou, Andrea Di Cicco, Francois Baudelet, Liu Hao Tjeng, Zhiwei Hu*

*Corresponding author for this work

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Abstract

We present a combined experimental and theoretical Pb-L3 X-ray absorption near-edge spectroscopy (XANES) to investigate the chemical state of Pb in transition metal perovskites PbTMO3 (TM = Ti, Ni). A pre-edge feature originated from the excitation of a 2p core electron to the 6s orbital is only observed in PbNiO3, from which the valence of Pb is determined to be Pb4+ with two 6s holes. However, no such 2p–6s related excitation was observed in PbTiO3, indicating the formation of Pb2+ with fully occupied 6s2 state in this materials. Our results demonstrate that this pre-edge peak from dipole allowed 2p–6s transition is a sensitive finger-print of the Pb valence state in solid state materials.

Original languageEnglish
Article number1800014
JournalPhysica Status Solidi (B): Basic Research
Volume255
Issue number6
DOIs
Publication statusPublished - Jun 2018
Externally publishedYes

Keywords

  • X-ray absorption near-edge spectroscopy
  • perovskites
  • valence states

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Chen, K., Mijiti, Y., Agrestini, S., Liao, S. C., Li, X., Zhou, J., Di Cicco, A., Baudelet, F., Tjeng, L. H., & Hu, Z. (2018). Valence State of Pb in Transition Metal Perovskites PbTMO3 (TM = Ti, Ni) Determined From X-Ray Absorption Near-Edge Spectroscopy. Physica Status Solidi (B): Basic Research, 255(6), Article 1800014. https://doi.org/10.1002/pssb.201800014