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

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Agrestini,  Stefano
Stefano Agrestini, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Liao,  Sheng-Chieh
Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Tjeng,  L. H.
Liu Hao Tjeng, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Hu,  Z.
Zhiwei Hu, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Chen, K., Mijiti, Y., Agrestini, S., Liao, S.-C., Li, X., Zhou, J., et al. (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, 1-4. doi:10.1002/pssb.201800014.


Cite as: https://hdl.handle.net/21.11116/0000-0000-B7B6-4
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.