Structural, optical and electronic properties of LaMgHx switchable mirrors
Structural, optical and electronic properties of LaMgHx switchable mirrors
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DOI：
10.1016/s0013-4686(01)00373-5
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发表时间：
2001-04
影响因子：
6.6
通讯作者：
J. Isidorsson;I. Giebels;E. S. Kooij;N. Koeman;J. Rector;A. Gogh;R. Griessen
中科院分区：
文献类型：
--
作者：
J. Isidorsson;I. Giebels;E. S. Kooij;N. Koeman;J. Rector;A. Gogh;R. Griessen
在原位真实的研究了氢化过程中镧镁合金薄膜的结构、光学和电学性质。X射线衍射分析表明，薄膜中含有CsCl结构的金属间化合物LaMg，以及fcc结构的β-La和fcc结构的LaHx。氢化引发β-La向β-LaHx的转变，而金属间相发生沉淀。在进一步吸收氢至LaH 3的过程中，fcc结构保持完整，Mg转变为MgH 2的金红石结构。在吸氢过程中，合金从具有高反射率的良好导电金属状态变为具有约3eV带隙的透明颜色中性绝缘体。
Structural, optical and electronic properties of lanthanum magnesium alloy thin films are studied in situ in real time during hydrogenation. X-ray data show that the as-deposited films contain the intermetallic phase LaMg with CsCl structure as well as fcc β-La and fcc LaHx. Hydrogenation initiates a transformation of β-La to β-LaHx, while the intermetallic phase disproportionates. The fcc structure stays intact during further uptake of hydrogen up to LaH3, and Mg transforms to the rutile structure of MgH2. During hydrogen absorption the alloys change from a good conducting, metallic state with high reflectance, to a transparent color neutral insulator with a band-gap of about 3 eV.