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- W2022451234 abstract "Structural phase transitions in thin, epitaxial yttrium hydride films have been studied by means of synchrotron x-ray diffraction topography (XDT), complemented by atomic force microscopy and by measurements of the electrical resistance. Depending on the applied hydrogen pressure during the gas-phase loading experiments and the chosen temperature, different phases exhibiting different symmetries and electronic properties could be established. Despite the small scattering volume of the 200-nm-thick film, the phase nucleation, the spatial distribution of domains as well as the lateral hydrogen diffusion could be observed. Those experiments demonstrate the feasibility of XDT to study structural properties like the dynamics of phase transitions in thin epitaxially grown films on the nanometer scale. From the progression of the domain boundary between the ${mathrm{YH}}_{2}$ and ${mathrm{YH}}_{3}$ phase the hydrogen mobility was determined to $5ifmmodetimeselsetexttimesfi{}{10}^{ensuremath{-}6}$ ${mathrm{cm}}^{2}/mathrm{s}$ at 300 ifmmode^circelsetextdegreefi{}C. Comparing high-temperature topographies with room-temperature results confirms that the phase boundary is narrower at high temperatures. Finally resistance measurements of Y/Nb double layers with varying hydrogen concentration confirm clearly that the ${mathrm{YH}}_{3}$ phase is insulating and that the resistance of the yttrium layer increases proportionally to the degree of ${mathrm{YH}}_{3}$ phase precipitation. The layer system acts as a hydrogen concentration-dependent potentiometer and could be used as a hydrogen sensor." @default.
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- W2022451234 date "2000-07-15" @default.
- W2022451234 modified "2023-10-16" @default.
- W2022451234 title "In situx-ray diffraction topography studies on the phase formation in thin yttrium hydride films" @default.
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- W2022451234 doi "https://doi.org/10.1103/physrevb.62.2164" @default.
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