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Thermodynamic studies of successive phase transitions in BaZnGeO4 and a new solid phase below 186.1 K (1989)

Hamano, A. ; Atake, T. ; Saito, Y.

Springer

Applied physics 49 (1989), S. 91-94

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ISSN: 1432-0630

Schlagwort(e): 64.60.-i ; 64.70.Kb ; 65.40.-f

Quelle: Springer Online Journal Archives 1860-2000

Thema: Maschinenbau , Physik

Notizen: Abstract The successive phase transitions of BaZnGeO4 have been studied on meltsolidified samples. A new solid phase (named phase VI) has been found below 186.1 K in samples of large particle size (diameter:D≳0.1 mm). The higher temperature crystalline phase V can be supercooled easily down to liquid helium temperature. On heating, however, it transforms into phase VI above 95 K in a slow exothermic process. Heat capacities have been measured by adiabatic calorimetry between 14 and 300 K. The enthalpy and entropy of the V–VI phase transition are 187.1 Jmol−1 and 0.971 J K−1 mol−1, respectively. The corresponding data for the IV–V phase transition at 199.8 K are 229.3 J mol−1 and 1.168 JK−1 mol−1. The phase VI does not appear in samples of smaller particle size (D≲0.1 mm).

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00615470

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Digitale Medien

Fine particles of icosahedral quasicrystal formed by gas evaporation technique (1989)

Saito, Y. ; Maki, T. ; Okazaki, T. ; [weitere]

Springer

The European physical journal 12 (1989), S. 127-129

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ISSN: 1434-6079

Schlagwort(e): 81.20 ; 61.14

Quelle: Springer Online Journal Archives 1860-2000

Thema: Physik

Notizen: Abstract Al-T (T=Mn, V, Cr) particles in the icosahedral phase have been prepared by evaporation and condensation of metals in an inactive gas. The particles were spherical in shape, with diameters ranging from 50 to 300 nm, and showed speckled contrast in bright and dark field images. Each particle consisted of fine grains of several nm with small misorientations (less than a few degrees). Patterson functions of the icosahedral Al-Mn were also calculated from electron diffraction data. Among several structure models examined in the present study, a model with an array of two-shell Mackay icosahedra gave the best fit with the Patterson functions.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF01426921

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