Lattice parameters and thermal expansion of solid CD4
Donald R. BaerPhysics Department of Materials Research Laboratory University of Illinois at Urbana-Champaign Urbana, Illinois 61801Benedick A. FraassPhysics Department of Materials Research Laboratory University of Illinois at Urbana-Champaign Urbana, Illinois 61801D. H. RiehlPhysics Department of Materials Research Laboratory University of Illinois at Urbana-Champaign Urbana, Illinois 61801R. O. SimmonsPhysics Department of Materials Research Laboratory University of Illinois at Urbana-Champaign Urbana, Illinois 61801
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Аннотация
Precise measurements of the lattice parameters of solid CD4 at saturated vapor pressure are reported for temperatures from 4.4 to 60 K. The x-ray results show two first order phase transitions near 26.9 and 22.0 K. For the two cubic phases, the lattice parameter a has been measured to an accuracy of 15 ppm, while for the low temperature tetragonal phase, the parameters c and a have been obtained to roughly 150 ppm. The thermal expansion for all three phases has been calculated from the data. Several interesting properties of the phase transitions are described.
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