Journal ArticleDOI
Evidence of mixed valence Cr $$^{+3}$$ + 3 /Cr $$^{+4}$$ + 4 in Y $$_{1-x}$$ 1 - x Ca $$_x$$ x CrO $$_3$$ 3 polycrystalline ceramics by X-ray photoelectron spectroscopy
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TLDR
In this paper, a high-resolution XRD and X-ray photoelectron spectroscopy (XPS) study was conducted on 100 compositions of polycrystalline ceramics and the results revealed that the average bond length decreases with increasing Ca content.Abstract:
Y $$_{{1-x}}$$
Ca
$$_{x}$$
CrO
$$_{3}$$
polycrystalline ceramics with 0.000 $$\le $$
x $$\le $$
0.100 compositions were studied by X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The results revealed that the $$\langle $$
Cr–O
$$\rangle $$
average bond length decreases with increasing Ca content. This fact infers that the charge compensation is through the change from Cr
$$^{+3}$$
to Cr
$$^{+4}$$
instead of oxygen vacancies. To confirm this supposition, the high-resolution XPS study revealed that as the Ca is introduced in the YCrO
$$_{3}$$
matrix, the Cr 2p
$$_{{3/2}}$$
core-level is well fitted at 576.22 and 577.57 eV belonging at Cr
$$^{+3}$$
and Cr
$$^{+4}$$
core-level, respectively. Furthermore, we found an increase of the valence band XPS spectra at the Fermi energy as the Ca replaces the Y site. This fact suggests an increase of the Cr 3d-state at the Fermi energy, which is confirmed by the XPS valence band spectra and the electrical conductivity measurements.read more
Citations
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References
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