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Proceedings Paper

Electrochromism of Mg-Ni hydride switchable mirrors
Author(s): Jan Isidorsson; I. A. M. E. Giebels; M. Di Vece; Ronald Griessen
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Paper Abstract

Switchable mirrors have so far been made of rare-earth and rare-earth-magnesium based metal-hydrides. In this investigation we study Mg-Ni-hydrides, which have been shown by Richardson et al. to exhibit switchable properties similar to those of the rare-earth hydrides. Cyclic voltammetry on MgzNiHx samples with 0.8 less than z less than 3.7 shows that addition of one Mg atom per Mg2Ni gives the best ab/desorption kinetics for hydrogen. X- ray diffraction reveals a structural change as hydrogen is absorbed. The metal-insulator transition is confirmed with simultaneous resistivity measurements. A pressure- composition isotherm of Mg2NiHx is also determined electrochemically. Optical spectrometry during gas loading gives an optical band gap of 1.6 eV for Mg2NiH4. This gap increases with increasing Mg content in a way similar to that of the Mg-doped rare-earth hydrides.

Paper Details

Date Published: 13 November 2001
PDF: 10 pages
Proc. SPIE 4458, Solar and Switching Materials, (13 November 2001); doi: 10.1117/12.448240
Show Author Affiliations
Jan Isidorsson, Uppsala Univ. and Vrije Univ. Amsterdam (Netherlands)
I. A. M. E. Giebels, Vrije Univ. Amsterdam (Netherlands)
M. Di Vece, Utrecht Univ. (Netherlands)
Ronald Griessen, Vrije Univ. Amsterdam (Netherlands)

Published in SPIE Proceedings Vol. 4458:
Solar and Switching Materials
Carl M. Lampert; Carl M. Lampert; Claes-Goran Granqvist; Claes-Goeran Granqvist; Keith L. Lewis; Keith L. Lewis, Editor(s)

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