N. V. Bausk | Searcharxiv

arXiv2003

XANES Pb LIII spectra of mixed-valence compound: Minium, Pb3O4

Mixed-valence compound Pb3O4 (minium) has been studied using X-ray absorption near-edge structure (XANES) spectroscopy and DFT calculations. In spite of presence of two valence states of lead [Pb(II) and Pb(IV)], the XANES spectrum of studied system is corresponding to apparently unified, an intermediate valence state of Pb. On the other hand, the 207Pb NMR spectra definitely show two different spectral bands corresponding to different Pb2+ and Pb4+ ions in Pb3O4 crystal structure. The explanation of this contradiction is related to the basics of XANES and NMR spectroscopy.

cond-mat.mtrl-sci↗

arXiv2003

XANES spectroscopy study of Pb(Ti, Zr)O3 ferroelectric thin films

Thin films of zirconium-rich perovskites Pb1-3x/2 Lax Zr0.65 Ti0.35O3 (PLZT; x=0.095) were studied using X-ray absorption near-edge structure (XANES) spectroscopy. Is shown, that slow crystallization of the system is accompanied by partial reduction of lead oxides to a metal (Pb0) state. The same results were found in the samples of the same composition with addition of 30% mol of PbO. The evidence for stereo active 6s2 lone-pair is discussed.

cond-mat.mtrl-sci↗