Isochronal Hydrogenation Of Textured Magnesium/palladium Thin Films

• Main Author: Ozgit, Cagla
• Other Authors: Ozturk, Tayfur
• Format: Others
• Language: Eng
• Published: METU 2009
• Subjects: TN Metallurgy 600-799; Magnesium; Magnesium hydride; Hydrogen absorption; Lattice mismatch; Textured thin film.
• Online Access: http://etd.lib.metu.edu.tr/upload/12610385/index.pdf

Pure and palladium&amp === #8208 === covered 350 nm thick magnesium thin films were deposited on glass substrates via thermal evaporation. In the as&amp === #8208 === deposited state, films were highly textured with Mg (001) parallel to the substrate. Hydrogen loading experiments were carried out in two different conditions === namely isothermal and isochronal. Hydrogenation behaviors of the thin films were followed by twopoint probe electrical resistance and optical transmittance measurements, as well as x&amp === #8208 === ray diffraction studies. Isothermal hydrogenation experiments conducted on Pd&amp === #8208 === covered Mg thin films have revealed that these films can absorb hydrogen at temperatures starting from 333 K, producing MgH2 with a random texture. When the films were heated slowly starting from the room temperature, on the other hand, hydrogenation gives rise to a textured MgH2, where (110) parallel to the substrate with a minor (101) component. Formation of the textured hydride in isochronal loading was discussed within the context of lattice mismatch in Mg to MgH2 transformation. It was further shown that formation of such a textured hydride in Mg thin films minimizes in&amp === #8208 === plane lattice distortion.