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Specimen preparation of low‐melting‐point solidified gases for low‐temperature powder diffractometry
Author(s) -
Arzi E.
Publication year - 1982
Publication title -
journal of applied crystallography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.429
H-Index - 162
ISSN - 1600-5767
DOI - 10.1107/s0021889882012266
Subject(s) - materials science , powder diffraction , melting point , cryostat , neutron diffraction , liquid nitrogen , diffraction , hydrogen , phase (matter) , helium , analytical chemistry (journal) , nitrogen gas , crystallography , composite material , chemistry , chromatography , optics , superconductivity , physics , organic chemistry , quantum mechanics
The quality of powder specimens in diffraction experiments is very important. Any preferred orientation in the specimen under study affects the observed integrated intensities of the powder peaks and makes them unreliable; thus, results obtained from these intensities hardly appear to be trustworthy. The existing methods of powder preparation were considered to be unsuitable for samples such as isotopic methanes, nitrogen, oxygen, hydrogen, etc . which are gaseous at room temperature and have relatively low melting points. Therefore, a new method was developed for producing fine‐grained powder specimens of solidified gases without preferred orientation directly from the gas phase using a specially designed liquid‐helium cryostat which allowed visual inspection of the formation of powder in the specimen container. Subsequent neutron diffraction tests proved that the powder specimens prepared by this method were free of preferred orientations.