2024-03-28T21:26:27Zhttps://eprints.lib.hokudai.ac.jp/dspace-oai/requestoai:eprints.lib.hokudai.ac.jp:2115/485252023-10-05T01:09:15Zhdl_2115_20045hdl_2115_139Shape-Controlled Growth of MgH2/Mg Nano/Microstructures Via Hydriding Chemical Vapor DepositionZhu, ChunyuHosokai, SouMatsumoto, Itoko1000050175808Akiyama, Tomohiroopen accessHydrogen storageMagnesium hydrideNanostucturesCrystal growthHydriding chemical vapor deposition430In this paper, we report the shape-controlled growth of MgH2/Mg nano/microstructures via hydriding chemical vapor deposition (HCVD), wherein magnesium vapor was deposited on a substrate at different temperatures ranging from 225 °C to 600 °C and H2 pressures ranging from 1 to 4 MPa. The products obtained after heating for 7, 13, and 20 h were identified by XRD and observed by SEM. The shape, size, and purity of the products strongly depended on the experimental conditions, which were classified according to the P-T equilibrium diagram for MgH2. The diagram showed six distinct areas for the products MgH2 and/or Mg having the following structures: fine and coarse powder, dendrite, root-like structure, straight and curved fibers, irregular bulk structure, and hexagonal and spherical structures. The diagram can be used quite effectively for controlling the shape of MgH2 and/or Mg, and this may lay the foundation for the mass production of nano/microsized MgH2/Mg for use in hydrogen storage or batteries.American Chemical Society2010engjournal articleAMhttp://hdl.handle.net/2115/48525https://doi.org/10.1021/cg100856n1528-74831528-7505AA1150352XCrystal Growth & Design101251235128https://eprints.lib.hokudai.ac.jp/dspace/bitstream/2115/48525/1/CGD10_5123-5128.pdfapplication/pdf2.81 MB2010