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(Color online) Microphotographs of a yttrium metal foil pressurized to in hydrogen fluid at room temperature. Transparent orange solid (right half) is the hydride containing fcc- and hexagonal-. The radiated part turns opaque black immediately by illumination with the light from an Ar ion laser (a), and the opaque area extends gradually to form a rectangular shape by further illumination (b).
Infrared transmission spectra measured at a time interval of for the photochromic sample at and room temperature. represents the saturated transmittance measured at .
(Color online) Variations in the transmittance with time during room-temperature annealing measured for the photochromic sample at 5.1 (black symbol), 11 (blue), and (red) at selected wavenumbers.
X-ray powder diffraction patterns measured for yttrium hydride before (broken line) and after laser illumination (solid line) at .
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