The 295 K unit cell parameters of Pr2Fe17Hx, where x is 0, 1, 2, and 3, have been determined by x-ray diffraction. Upon hydrogenation, the unit cell volume expands anisotropically with a 1.2% expansion of the a axis and no expansion of the c axis for x=3. The Curie temperatures are 286, 374, 440, and 484 K, for x=0, 1, 2, and 3, respectively. The Mössbauer spectra have been measured between 4.2 and 295 K, and the spectra of Pr2Fe17H and Pr2Fe17H2, obtained above 80 K, and those of Pr2Fe17H3, obtained above 120 K, have been analyzed with a seven sextet model, a model which corresponds to basal magnetic anisotropy. The Mössbauer spectra of Pr2Fe17H3 change dramatically upon cooling below 80 K, and between 4.2 and 75 K they are well fit with a four sextet model which corresponds to axial magnetization. Between 80 and 120 K, the spectra are very complex and, hence, the Mössbauer spectra reveal a spin reorientation which occurs between 80 and 120 K in Pr2Fe17H3.



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© 1999 American Institute of Physics (AIP), All rights reserved.

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01 Apr 1999

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