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[ Last edited by hslining on 2009-1-3 at 10:16 ]
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hslining

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http://www.sciencemag.org/cgi/reprint/322/5909/1816.pdf
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Originally posted by monicajing at 1/2/09 20:37:
¡¾ÌâÄ¿¡¿Matching Glass-Forming Ability with the Density of the Amorphous Phase
¡¾×÷Õß¡¿Y. Li,1,2* Q. Guo,1,2 J. A. Kalb,1,3 C. V. Thompson1,3*
¡¾¿¯Ãû¼°ÆÚ¾í¡¿Science 19 December 2008: Vol. 322. n ...

3Â¥2009-01-03 10:04:33
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monicajing

Í­³æ (СÓÐÃûÆø)


¡ï ¡ï ¡ï
ÄÉÃ×Äø·Û(½ð±Ò+3,VIP+0):ÓÐÏÂÔØµÄÁ´½ÓÂð?ÏÈллÁË
¡¾ÌâÄ¿¡¿Matching Glass-Forming Ability with the Density of the Amorphous Phase
¡¾×÷Õß¡¿Y. Li,1,2* Q. Guo,1,2 J. A. Kalb,1,3 C. V. Thompson1,3*
¡¾¿¯Ãû¼°ÆÚ¾í¡¿Science 19 December 2008: Vol. 322. no. 5909, pp. 1816 - 1819
¡¾ÕªÒª¡¿
The density of the amorphous phase of metals is generally thought to be related to glass formation, but this correlation has not been demonstrated experimentally to date. In this work, systematic deflection measurements using microcantilevers and a combinatorial deposition method show a correlation between glass-forming ability and the density change upon crystallization over a broad compositional range in the copper-zirconium binary system. Distinct peaks in the density of the amorphous phase were found to correlate with specific maxima in the critical thickness for glass formation. Our findings provide quantitative data for the development of structural models of liquids that are readily quenched to the amorphous state. The experimental method developed in this work can facilitate the search for new glass-forming alloys.
2Â¥2009-01-02 20:37:20
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

seek269

Ìú³æ (ÕýʽдÊÖ)


¡ï ¡ï ¡ï
hslining(½ð±Ò+3,VIP+0):Ô­´´£¬¹ÄÀø£¡
¡¾ÌâÄ¿¡¿Crystal chemistry and Calphad modeling of the r phase
¡¾×÷Õß¡¿J.-M. Joubert
¡¾ÕªÒª¡¿A systematic review of the crystal chemical properties of the r phase is presented, with special
emphasis on the atomic order, i.e. the distribution of the atoms on the different sites of the crystal
structure. The data available in the literature have been systematically assessed, and are complemented
by an experimental investigation in the following systems: Al¨CNb, Al¨CTa, Cr¨CMn, Cr¨COs,
Cr¨CRe, Cr¨CRu, Co¨CMo, Fe¨CMo, Fe¨CRe, Mn¨CMo, Mn¨CRe, Mn¨CV, Mo¨CRe, Nb¨CPt, Nb¨CRe, Ni¨C
V, Pd¨CTa, Re¨CV, Rh¨CTa and Ru¨CW. The properties are analyzed as a function of composition
and the nature and atomic size of the elements involved. The possibility of an order¨Cdisorder transition
has also been reviewed and completed by diffraction experiments in two systems (Cr¨CMn and
Ni¨CV). First-principles calculations on the r phase are reviewed in line with the Calphad approach.
An analysis of the literature data concerning the Calphad modeling of systems involving the r phase
has been made. The different models used are presented and discussed. The conclusions of crystal
structure data analysis are used to make some recommendations about the choice of a model in
the frame of a Calphad assessment.
¡¾¿¯Ãû¼°ÆÚ¾í¡¿Progress in Materials Science 53 (2008) 528¨C583
¡¾ÏÂÔØÁ´½Ó¡¿http://www.namipan.com/d/Hartsch ... 8500605f3a5e1716a00
4Â¥2009-01-04 11:03:12
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

minicar

½ð³æ (ÖøÃûдÊÖ)


¡ï ¡ï ¡ï
hslining(½ð±Ò+3,VIP+0):Ö§³Ö!
¡¾ÌâÄ¿¡¿A Quantitative Single-Molecule Study of Thioether Molecular Rotors
¡¾×÷Õß¡¿Ashleigh E. Baber, Heather L. Tierney, and E. Charles H. Sykes
¡¾ÕªÒª¡¿This paper describes a fundamental, single-molecule study of the motion of a set of thioethers
supported on Au surfaces. Thioethers constitute a simple, robust system with which molecular rotation can be
actuated both thermally and mechanically. Low-temperature scanning tunneling microscopy allowed the
measurement of the rotation of individual molecules as a function of temperature and the quantification of both
the energetic barrier and pre-exponential factor of the motion. The results suggest that movement of the second
CH2 group from the S atom over the surface is responsible for the barrier. Through a series of single-molecule
manipulation experiments, we have switched the rotation on and off reversibly by moving the molecules toward
or away from one another. Arrhenius plots for individual dibutyl sulfide molecules reveal that the torsional barrier
to rotation is1.2 kJ/mol, in good agreement with the temperature at which the molecule¡¯s appearance changes
from a linear to a hexagonal shape in the STM images. The thioether backbone constitutes an excellent test bed
for studying the details of molecular rotation at the single-molecule level.
¡¾¿¯Ãû¼°ÆÚ¾í¡¿ACS Nano, 2008, 2 (11), 2385-2391
¡¾ÏÂÔØÁ´½Ó¡¿http://www.namipan.com/d/32dd948 ... 29d227f2543431a0700
5Â¥2009-01-05 09:11:01
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