ISSN:
1600-5767
Quelle:
Crystallography Journals Online : IUCR Backfile Archive 1948-2001
Thema:
Geologie und Paläontologie
,
Physik
Notizen:
A new type of X-ray apparatus with an image plate as an area detector has been developed in order to study phase transitions at low temperatures. The system is essentially composed of a high-precision-type double-axis diffractometer with a vertical-type Weissenberg camera controlled by a computer and is combined with a helium-gas closed-cycle cryogenic refrigerator. Oscillation and Weissenberg photographs down to 12 K were taken with an image plate. The image plate is replaced easily by a conventional scintillation counter, so that both photographic and counter methods are available. New superlattice reflections associated with the phase transition of an isolated hydrogen-bond system, K3D(SO4)2, were observed at 15 K, and the space group of the low-temperature phase was determined. The anisotropic diffuse scattering around Bragg reflections in Fe–30.2 at.% Pd was also clearly observed in connection with a martensite phase transition.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1107/S0021889894012884
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