Concentration-pressure isotherms were measured together with the optical transmission in polycrystalline Gd and GdMg thin-film switchable mirrors. Formation plateaus in GdMg alloys, corresponding to gadolinium dihydride and trihydride as well as magnesium dihydride have been found. From these, the formation enthalpies could be calculated. These results show that the GdMg alloys are phase separated. From the onset of the transmission we conclude that the formation of gadolinium trihydride is the final stage in the switching process.
Optical switching properties from isotherms of Gd and GdMg hydride mirrors / M. Di Vece, S.J.M. Zevenhuizen, J.J. Kelly. - In: APPLIED PHYSICS LETTERS. - ISSN 0003-6951. - 81:7(2002), pp. 1213-1215. [10.1063/1.1499765]
Optical switching properties from isotherms of Gd and GdMg hydride mirrors
M. Di Vece
;
2002
Abstract
Concentration-pressure isotherms were measured together with the optical transmission in polycrystalline Gd and GdMg thin-film switchable mirrors. Formation plateaus in GdMg alloys, corresponding to gadolinium dihydride and trihydride as well as magnesium dihydride have been found. From these, the formation enthalpies could be calculated. These results show that the GdMg alloys are phase separated. From the onset of the transmission we conclude that the formation of gadolinium trihydride is the final stage in the switching process.
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