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³¬¼¶ÀÏ¿ì: ½ð±Ò+150, ·ÒëEPI+1, ¡ï¡ï¡ïºÜÓаïÖú 2016-09-19 15:54:15
³¬¼¶ÀÏ¿ì: ½ð±Ò+150, ·ÒëEPI+1, ¡ï¡ï¡ïºÜÓаïÖú 2016-09-19 15:54:15
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1.ÎÒÃǵ¥¶À²âÊÔ¹ýÁË Na2CO3 ºÍ MgCO3·ÛÌå µÄÀÂü¹âÆ×£¬È·¶¨ÁË Mg-O Óë Na-O¼ü ÉìËõÕñ¶¯ µÄ ÀÂü²¨Êý ¶¼ÔÚ400cm-1ÒÔÏ£¬ÇÒ Mg-O ´óÓÚ Na-OµÄ ²¨Êý¡£Ëæ MgOµÄÔö¼Ó£¬ÔÏÈÔÚ 250cm-1×óÓÒµÄ ²¨Êý ÔÚ ¸ß²¨Êý À©Õŵ½ 400cm-1¡£ 1. We tested the Raman spectra of Na2CO3 and MgCO3 powder, respectively and determined that the Raman wave numbers (RWN) for the stretching vibrations of Mg-O and Na-O bond were both under 400cm-1, wherein the RWN of Mg-O was larger than that of Na-O. With increase of MgO, the previous RWN which was around 250cm-1 expanded to 400cm-1. 2.ÔÚÀÂü¹âÆ×ͼÖУ¬ÑùÆ·SNM-1ÖРλÓÚ1050cm-1¸½½ü ÓÐ Á½¸öÎüÊշ壬¿ÉÄÜÊÇ ÓÉÓÚ Na+Àë×Ó ÔÚ ²£Á§ÍøÂç½á¹¹ÖÐ Ö»Æðµ½ ¶ÏÍø×÷Óã¬ÐÎ³É ·ÇÇÅÑõ¼ü£¬´¦ÓÚ Si-O »ò Al-O¼ü µÄÄ©¶Ë£¬¶ø ËÄÃæÌå¶¥µãµÄ ½¡½Ç ÓÐËù²î±ð£¬Ê¹µÃÔÚ 1050cm-1³ö Si-O-NaºÍAl-O-NaµÄ ÀÂüÕñ¶¯·å ÓР΢СµÄ²î±ð£¬¶ø ÐγÉË«·å½á¹¹¡£¶øMgOµÄ ¼ÓÈë ʹµÃ ²£Á§½á¹¹ ±äµÃ½ôÃÜ£¬ÊÇ ÓÉÓÚMg2+ Æðµ½ÁË Á´½ÓSi-OÓëAl-OµÄ×÷Óã¬Á´½Ó·½Ê½ ½ÏΪµ¥Ò»£¬ÇÒ Mg2+ÓëNa+µÄ Á´½Ó·½Ê½ ÏàËÆ£¬ËùÒÔ Si-O-R ÔÚ 1050cm-1 ¶¼ ÓÐÀÂüÕñ¶¯·å¡£ËùÒÔµ± MgOÌí¼Óʱ£¬ÀÂü¹âÆ× ÔÚ1050cm-1 ¸½½ü ÓÉ Ë«·å ºÏΪ µ¥·å¡£ 2. In the Raman spectrogram, we can see that sample SNM-1 has two absorption peaks at around 1050cm-1. This is mainly because that Na+ only acted as a role of network-breaker in the glass network structure, forming non-bridging oxygen bond at the terminal of Si-O or Al-O bond; however the bond angles at tetrahedron vertex were different, so that the Raman vibration peaks of Si-O-Na and Al-O-Na at 1050cm-1 were different, and double peak structure were formed. On the other hand, the glass structure became more tight with the addition of MgO, which is mainly due to that the Mg2+ played a role of linking Si-O and Al-O in a relatively single way. Moreover as Mg2+ and Na+ shares similar linking way, Si-O-R had Raman vibration peak at 1050cm-1. That is the reason why double peaks combined into single peak at around 1050cm-1 with the addition of MgO. |
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