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yinshengxu

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hslining(½ð±Ò+3,VIP+0):Ö§³Ö
¡¾ÌâÄ¿¡¿A photo-stable chalcogenide glass
¡¾×÷Õß¡¿Guang Yang et al
¡¾ÕªÒª¡¿Photo-darkening and photo-bleaching are well known phenomena in As-Se and Ge-Se chalcogenide glasses, respectively. Consequently, a systematic dependence of photo-induced optical changes in GexAs45-xSe55 glass series on x is expected between these two extremes. This prediction of photosensitivity on Ge/As ratio has been exploited to demonstrate the first intrinsically photo-stable chalcogenide glass at x~10, which would be suitable for fabricating photo-insensitive optical components for various applications.
¡¾¿¯Ãû¼°ÆÚ¾í¡¿ Vol. 16, No. 14 / OPTICS EXPRESS
¡¾ÏÂÔØÁ´½Ó¡¿http://www.namipan.com/d/A%20pho ... 6d2005e4f0c7c931200
9Â¥2009-01-09 18:44:49
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû
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monicajing

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¡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

hslining

ľ³æ (ÕýʽдÊÖ)


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
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
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