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1.·ÖÏಣÁ§µÄ¹âÉ¢ÉäÌØÐÔÊÇÓÉÓÚ·ÖÏàÇøÓë»ùÖʲ£Á§Ö®¼äµÄÕÛÉäÂʲîÒýÆðµÄ¡£¹âÉ¢ÉäÇ¿¶ÈÓë·ÖÏà¿ÅÁ£µÄÐÎ×´¡¢´óС¼°·Ö²¼ÃܶÈÓйء£µ±·ÖÏà³öÀ´µÄ¹ÂÁ¢ÒºµÎÏàºÜСʱ£¬É¢Éä¹âÖУ¬À¶×ÏÉ«¹âµÄÇ¿¶È´ó£¬Õ¼µÄ±ÈÀý¸ß£»µ±¹ÂÁ¢ÒºµÎÏà³ß´ç½Ï´óʱ£¬³ÊÏÖÀ¶°×ÉõÖÁÈé°×É«µÄÉ¢ÉäÏÖÏó¡£ Light scattering character for glass with phase separation is due to difference in reflective index for bulk glass matrix and phase separated regions. The extent of light scattering is related to the size, shape and distribution density of phase separated zones. When separated phase presents as well dispersed small droplets£¬ the scattered light is intense and has disproportional blue-purple color. When the size of well dispersed droplets increases, the scattered light has a blue-white color or even a cream color. 2. ÈÈ´¦ÀíζȵÄÉý¸ß£¬ÓÐÁ½¸ö»úÖÆÔÚͬʱÆð×÷Ó㺴Ӷ¯Á¦Ñ§ÒòËØ¿¼ÂÇ£¬Î¶ÈÓú¸ß£¬²£Á§Õ³¶ÈÓúµÍ£¬½á¹¹µ÷Õû¼Ó¿ì£¬·ÖÏàËÙÂÊÔö¼Ó£¬·ÖÏà³ß´çÔö´ó£»´ÓÈÈÁ¦Ñ§½Ç¶È¿¼ÂÇ£¬Î¶ÈÓú¸ß£¬Æäƽºâ̬µÄ»ìÈݳ̶ÈÓú´ó£¬¼´¸»¹èÂÁÏàÖеÄîÑ¡¢Ã¾ºÍ¸»îÑþÏàÖеĹèÂÁº¬Á¿Ôö¼Ó¡£ÓÉÓÚÈÈÁ¦Ñ§Ö»Ñо¿Óëʱ¼äÎÞ¹ØµÄÆ½ºâ̬£¬Î´¿¼ÂǶ¯Á¦Ñ§Ìõ¼þ£¬µ±Êܶ¯Á¦Ñ§ÒòËØÏÞÖÆ£¬²»Äܴﵽƽºâ̬£¬Ö»ÓÐζȴﵽһ¶¨¼«ÏÞʱ£¬¶¯Á¦Ñ§Ìõ¼þ¿Éʹ·ÖÏà´ïµ½Æ½ºâ̬£¬²£Á§·ÖÏà³Ì¶È×î´ó£¬·ÖÏà³ß´ç´ïµ½×î´ó¡£ As the temperature is raised during heat treatment£¬two events occur simultaneously£ºkinetically£¬ the viscosity decreases at higher temperature£¬ which promotes faster structure reorganization and accelerates phase separation and increases the size of separated phase£» thermodynamically£¬ the higher temperature leads to better mixing at the equilibrium£¬ that is the titanium and magnesium contents are higher in silicon-aluminum rich phase£¬ same as the silicon-aluminum contents in titanium and magnesium-rich phase. One however has to consider that thermodynamic only study idealized equilibrium status regardless how long it takes to reach the equilibrium£¬ in reality£¬ most systems can not reach equilibrium status due to limitations imposed by kinetic factors. Only when temperature reaches certain threshold£¬ phase separation can reach its equilibrium kinetically£¬ when phase separation is completed and the size of separated phase reaches maximum. 3.8.Ëæ×ÅÈÈ´¦Àíʱ¼äµÄÑÓ³¤£¬²£Á§·ÖÏàÇãÏòÓÚÆ½ºâ̬£¬·ÖÏදÁ¦Ñ§¿ÉÒԺܺõؽâÊÍÕâÖÖÏÖÏó¡£²£Á§·ÖÏàµÄ¶¯Á¦¹ý³Ì·ÖΪÆð·ü-À©É¢-´Ö»¯Èý¸öÖ÷Òª½×¶Î½øÐС£·ÖÏ࿪ʼµÄ¡°Æð·ü¡±½×¶ÎÊÇ£º×é³ÉÆð·ü·ù¶ÈµÄ²»¶ÏÔö¼Ó£¬´Ùʹ²»¾ùÔÈÇøºË»¯ºÍϵͳ×ÔÓÉÄÜÔÝʱÉý¸ß£¬¶øÐγÉÐÂÏàµÄ¹ý³Ì¡£·ÖÏàºóµÄÑùÆ·½Ó×ŵġ°À©É¢¡±½×¶ÎÊDz»¾ùÔÈÇøÉú³¤µ½ÁÙ½ç״̬ºó£¬ÒýÆðϵͳ×ÔÓÉÄܽµµÍµÄ¹ý³Ì£»µÚÈý¸ö¡°´Ö»¯¡±½×¶ÎÊÇС¿ÅÁ£Èܽ⡢´ó¿ÅÁ£³¤´óµÄ¹ý³Ì¡£´Ö»¯Íƶ¯Á¦À´×Ô±íÃæ»ý¼õС¶øÔì³Éϵͳ×ÔÓÉÄܼõС¡£Òò´Ë£¬ÈÈ´¦Àí±£ÎÂʱ¼äÔ½³¤£¬¹è¸»¼¯³Ì¶ÈÔ½´ó£¬·ÖÏàÔ½Ã÷ÏÔ¡£ As heating progresses, glass phase separation gradually approaches its equilibrium, which can be described kinetically as three main stages: fluctuation, diffusion and coarsening. At the fluctuation stage, the fluctuation in composition steadily increases, which promotes heterogeneous regional nucleation accompanied with a temporally raise in free energy, eventually it leads to new phase formation. The diffusion stage that follows the phase separation is the growth of heterogeneous regions till a critical point is reached, a process that accompanies with the fall of free energy. The coarsening stage is a process when small granules start to merge into large granules, which is driven by the tendency to reduce the surface area to minimize free energy. Therefore, the longer heating is, the greater extent for the silicon-enriched regions is, and more apparent phase separation it becomes. |

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