Orientation dependent work function of in situ annealed strontium titanate
L F Zagonel, M B\"aurer, A Bailly, O Renault, M Hoffmann, S-J Shih, D, Cockayne, N Barrett
TL;DR
This study investigates how grain orientation and surface conditions affect the work function of niobium-doped strontium titanate ceramics using advanced microscopy and synchrotron radiation.
Contribution
It demonstrates the orientation dependence of work function in sintered strontium titanate and highlights the effectiveness of energy filtered XPEEM for analyzing polycrystalline materials.
Findings
Significant variation in work function across different grain orientations.
Surface reducing/oxidizing conditions influence work function values.
Energy filtered XPEEM is effective for analyzing polycrystalline samples.
Abstract
We have used energy filtered x-ray photoelectron emission microscopy (XPEEM) and synchrotron radiation to measure the grain orientation dependence of the work function of a sintered niobium doped strontium titanate ceramic. A significant spread in work function values is found. Grain orientation and surface reducing/oxidizing conditions are the main factors in determining the work function. Energy filtered XPEEM looks ideally suited for analysis of other technologically interesting polycrystalline samples.
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