X-ray emission spectra in stoichiometrically highpurity Ba1-x
Sr
x
TiO3 (x=0 to 1) powder have been investigated because of the poor understanding of the physics of electronic structure in such systems. The Sr Kβ emission band was found to contain two bands around 15.88 and 16.15 keV attributed to Kβ1 and Kβ3 respectively. The Ti Kβ emission spectra were found to shift towards low energy side with the increase in Sr concentration. The binding energy (BE) of L level remains unchanged with the Sr concentration. From these observations it has been possible to conclude that change in the stoichiometry of the compound does not change the process of multiple ionisation or core hole-electron interaction. Further for Ti Kβ emission, it has been possible to say that 4p states of Ti hybridises with 2p states of oxygen and this hybridisation decreases with the increase in vacancies in the system. This results in pushing up the Fermi level E
f.
Vanadium oxide as well as molybdenum oxide thin films have been found to show electrochromism and metal insulator transitions. Incorporation of vanadium ion into molybdenum oxide lattice not only changes the lattice parameters but also shows prominent spectral changes in X-ray emission spectra. K~l-3 emission spectra of vanadium in different alloy films of V2Os-MoO3 system have been studied here and these have been compared with the X-ray emission spectra of similar composition of V2Os-MoO3 powders. For K~_3 emission, the difference in values of asymmetry indices of thin films and powders is marginal, although considerable tailing towards high energy is observed in thin films. By curve fitting procedure, the K/~_3 emission spectra have been resolved to several gaussian peaks, and these have been explained on the basis of vacancy-induced electronic states, crossover transitions advocated in molecular orbital theory and plasmon oscillation.
The Fourier method has been utilized to analyse line profile broadening and root-mean-square strain of synthetically prepared ~-MnOz. The effect of temperature on crystallite size and strain has also been investigated. The crystallites are found to be highly anisotropic even after annealing at high temperature.The crystallite size and strain do not affect the depolarization capacity of MnO/ up to 573 K.
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