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An automatic system for X‐ray studies of phase transitions at low temperatures
Author(s) -
Clarke R.,
Morley R. E.
Publication year - 1976
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/s0021889876011965
Subject(s) - phase transition , atmospheric temperature range , lattice (music) , coolant , gas phase , materials science , volumetric flow rate , temperature control , range (aeronautics) , thermodynamics , analytical chemistry (journal) , chemistry , physics , chromatography , acoustics , composite material
A low‐temperature system is described for the automatic recording of lattice‐parameter variations in crystals down to −185°C. The design is based on a continuous gas‐flow method with `three‐term' control of the local gas temperature to within ±0.5°C. The temperature can be programmed up or down over a range of 200°C. Consumption of coolant (~1 l h −1 ) is minimized by automatically decreasing the rate of gas flow as the temperature is increased. Results obtained for the structural phase transition in Sn 0.65 Ge 0.35 Te are presented.