منابع مشابه
Low-temperature heat capacities of synthetic pyrope,
The heat capacities of synthetic pyrope (Mg,Al,Si,O,,), grossular (CasAI,SisO12), and a solid solution pyrope,,grossular,, (Mg,,sCa,,,Al,Si,O,,) have been measured by adiabatic calorimetry in the temperature range l&350 K. The samples were crystallized from glasses in a conventional pistoncylinder apparatus. The molar thermophysical properties at 298.15 K (J mol’ K‘) are: c; So298 % H’h, &P Pyr...
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The concept of negative heat capacities of clusters has been examined and argued. This discussion examines the arguments and concepts with the goal of clarifying the inherent ambiguities in the concept itself. We also show how one must use caution with this and related concepts that extend to nonequilibrium systems properties that are well defined just for equilibrium systems. INTRODUCTION—PECU...
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We proceed to a critical examination of the method used in nuclear fragmentation to exhibit signals of negative h eat capacity. We show that this method leads to unsatisfactory results when applied to a simple and well controlled model. Discrepancies are due to incomplete evaluation of potential energies. The possibility to observe negative heat capacities has been recently the object of much i...
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The presumably cyclic molecules Ses, Se6 and Se; are the main constituents of saturated selenium vapor at temperatures up to 400 °C as well as of the vapor above freely subliming trigonal selenium, and cyclic Seg molecules can be prepared as various crystalline modifications [1], Small selenium rings are also discussed as constituents of liquid and amorphous selenium obtained by quenching the l...
متن کاملHeat capacities of mass selected deprotonated water clusters.
Heat capacities of mass selected deprotonated water clusters (H(2)O)(n-1)OH(-) have been measured in the size range n = 48-118, as a function of temperature. We have found that they undergo a melting-like transition in the range 110-130 K. The transition temperature is size dependent with a strong correlation with the dissociation energy around the shell closure at n = 55.
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ژورنال
عنوان ژورنال: Journal of Nuclear Science and Technology
سال: 2002
ISSN: 0022-3131,1881-1248
DOI: 10.1080/00223131.2002.10875595