ISSN:
1432-0630
Keywords:
64.60.-i
;
64.70.Kb
;
65.40.-f
Source:
Springer Online Journal Archives 1860-2000
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
,
Physics
Notes:
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).
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00615470
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