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³¬¼¶ÀÏ¿ì: ½ð±Ò+130, ·ÒëEPI+1, ¡ï¡ï¡ïºÜÓаïÖú 2016-12-05 11:51:46
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1.TiO2Ϊ²£Á§ÍøÂçÖмäÌ壬¿ÉÒÔÈÛÓÚ²£Á§ÈÛÌå¡£ÔÚ²£Á§ÍøÂç½á¹¹ÖУ¬îÑÀë×ÓÓëÑõÐγÉÁùÅäλºÍËÄÅäλÁ½ÖÖ״̬£¬ÓÉÓÚÓë¹èÑõÍøÂç´æÔڽṹ²îÒ죬ÇÒîѵÄÀë×ÓÊÆ½Ï¸ßÓë¹èÕù¶áÑõµÄÄÜÁ¦½ÏÇ¿£¬¿É´Ù½ø·ÖÏ࣬ÇÒ¾Û¼¯ÓÚ¸»¼îÏàÖС£¸»¼îÏಣÁ§Õ³¶ÈµÍ£¬ÓÐÀûÓÚ·ú»¯Îï¾§ÌåÓë½ðÊôÄÉÃ׿ÅÁ£µÄÎö³ö¡£ TiO2, which is soluble in melted glass, acts as a stuffing material(Ìî³äÎï, ¶ÔÂð?). A titanium ion can form octahedral and tetrahedral coordinations with oxygen. Due to their differences in structures, and greater ionic potential for titanium ions, titanium ions are preferred over silica for oxygen, which leads to phase separation, and TiO2 is located in alkali-rich phase. The low viscosity of alkali-rich phase favors crystallization process for fluoride crystal and metal nanoparticles. 2.ÔÚ²£Á§ÍøÂç½á¹¹ÖУ¬îÑÀë×ÓÆðµ½ÍøÂçÖмäÌåµÄ×÷Óã¬ÓÉÓÚîÑÀë×Ó¿ÉÒÔÓëÑõÐγÉÁùÅäλºÍËÄÅäλÁ½ÖÖ״̬¡£ÔÚ¸ßβ£Á§ÈÛÌå¿ìËÙÀäÈ´µÃµ½µÄ²£Á§ÖУ¬îÑÀë×Ó¿ÉÄÜÓëÑõÐγÉËÄÅä룬´Ó¶øÓë¹èËáÑÎÍøÂç½á¹¹ÏàÈÝ£¬¼´ TiO2ÈÛÓÚ²£Á§ÈÛÌ壬²¢ÒÔÏàͬµÄ״̬±£³ÖÔÚÓɲ£Á§ÈÛÌå¿ìËÙÀäÈ´µÃµ½µÄ²£Á§ÖУ¬¶øÕâÖÖ±£´æÏÂÀ´µÄ״̬ÊDz»Îȶ¨µÄ£¬µ±½«²£Á§ÖØÐ¼ÓÈȵ½Ò»¶¨³Ì¶È£¬îÑÀë×Ó¿ªÊ¼Ç÷Ïò´ïµ½Æ½ºâÅä룬¼´ÁùÅäλ[TiO6]8-£¬´Ëʱ²¿·ÖîÑÀë×ӾͲ»ÔÙÕ¼¾ÝÍøÂçÐγɵÄλÖ㬲»²ÎÓëÍøÂçÐγɣ¬²¢¸»¼¯ÓÚÒ»Ïà¡£ Within glass network structures, a titanium ion can form octahedral and tetrahedral coordinations with oxygen, and acts as a stuffing material. For glass prepared by a rapid cooling process, titanium ion forms tetrahedral coordinations with oxygen, which is compatible with the silicate network, is soluble in melted glass, and can maintain an even distribution during the rapid cooling process. However, such a status is only meta-stable, when reheated to certain temperature, titanium ions tend to shift the equilibrium to an octahedral coordination with oxygen (TiO6)8-. As a consequence, a portion of the titanium ions no longer participate with the network, it undergoes a phase separation, becomes alkali-enriched phase. 3. Ti4+µÄ°ë¾¶Ð¡£¬µçºÉ¸ß£¬³¡Ç¿´ó£¬ÈÝÒ×¼«»¯ÖÜΧµÄÑõÀë×ÓÒÔ½¨Á¢ÆÁ±Î£¬´Ó¶ø´Ù½ø·ÖÏà¡£·ÖÏàÔòΪ¾§»¯µÄ³ÉºËÌṩÇý¶¯Á¦£¬·ÖÏà²úÉúµÄ½çÃæÎª¾§ÏàµÄ³ÉºËÌṩÓÐÀûµÄ³ÉºËλ£¬Ê¹×÷Ϊ¾§ºË¼ÁµÄ³É·Ö¸»¼¯ÔÚÁ½ÏàÖеÄÒ»ÏàÖУ¬È»ºóÓÉËü´ÓÒºÏàת±äΪ¾§Ï࣬¶øÆðµ½¾§ºË×÷ÓᣠDue to its smaller radius, high charge density, and large field strength, Ti4+ can readily polarize the surrounding oxygen, establish a shielding, and promote phase separation. The phase separation can be a driving force for the nucleation, as the interface provides favorable nucleation sites, and high concentration of the nucleating agent found in the alkali-enriched phase promotes the nucleation process. |

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