Recent theoretical studies fK. Joshi, D. G. Kanhere, and S. A. Blundell, Phys. Rev. B 67, 235413 s2003dg predict that Sn20 melts at around 1200 K. We have performed calorimetry measurements on unsupported Sn18 + , Sn19 + , Sn20 + , and Sn21 + in an effort to test this prediction. We find that these tin clusters disappear well below their predicted melting temperature due to dissociation. Calori...

SnSe and SnS have been grown by BridgmanStockbarger method. Loading time as a function of vickers microhardness has been measured at different temperatures in the range 303 K to 388K. Al measurement of hardness have been carried out on the cleavage planes. The activation energy for creep has been evaluated to be 2.92 and 1.75 K Cal/mole, respectively, for SnSe and SnS crystals.

A study was conducted on the transformation of SnO to SnO2 using X-ray diffraction and subjecting the SnO to heat treatments between 300 °C < T < 600 °C in two different atmospheres, argon and air. The intermediary oxide that appears in the disproportionation process was identified as Sn2O3. In an argon atmosphere, decomposition occurs in three stages: (1) a direct transformation of SnO to SnO2...

[reaction: see text] Nanometer tin-mediated allylation of aldehydes or ketones in distilled or tap water gave rise to corresponding homoallyl alcohol in high yield without any other assistance such as heat or supersonic or acidic media.

Experimental studies established that calcium undergoes several counterintuitive transitions under pressure: fcc --> bcc --> simple cubic --> Ca-IV --> Ca-V, and becomes a good superconductor in the simple cubic and higher-pressure phases. Here, using ab initio evolutionary simulations, we explore the behavior of Ca under pressure and find a number of new phases. Our structural sequence differs...

In this paper, we present a formal analysis of a Controller Area Network (CAN) controller using the Z speciication language. It is a step in the evaluation of functional and performance properties of CAN applications. We rst show how an external view of a CAN controller functionalities can be held in Z. Z is based on set theory and rst order logic and is very expressive: a unique notation allow...

so portable, that it would be most useful on field service. It is prepared from green mangoes. The unripe fruit is cut into several pieces and dried in the sunshine, the kernel and peel being rejected. In this state it is Kuttaicalled huttai, (emphasis on last syllable,) but to preserve it properly, it must be ponnded to a fine powder, and rammed into an air-tight tin canister, or wide-mouthed ...

The zero temperature phase diagram of Cooper pairs exposed to disorder and a magnetic field is determined theoretically from a variational approach. Four distinct phases are found: a Bose and a Fermi insulating, a metallic, and a superconducting phase, respectively. The results explain the giant negative magnetoresistance found experimentally in In-O, TiN, Be and high-T(c) materials.

The fact that the melting points of nanoparticles are always lower than those of the corresponding bulk material is a paradigm supported by extensive experimental data for a large number of systems and by numerous calculations. Here we demonstrate that tin cluster ions with 10-30 atoms remain solid at approximately 50 K above the melting point of bulk tin. This behavior is possibly related to t...

P. C. J. J. Coumou,1,* E. F. C. Driessen,2,† J. Bueno,3 C. Chapelier,2 and T. M. Klapwijk1,4 1Kavli Institute of Nanoscience, Delft University of Technology, Delft, The Netherlands 2SPSMS/LaTEQS, UMR-E 9001, CEA-INAC and Université Joseph Fourier, Grenoble, France 3SRON Netherlands Institute for Space Research, Utrecht, The Netherlands 4Physics Department, Moscow State Pedagogical University, 1...