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The crystal structure of synthetic konyaite, Na2Mg(SO4)2¡¤5H2O, a = 5.7690(8), b = 23.951(3), c =8.0460(11) Å, ¦Â = 95.425(2)¡ã, V = 1106.8(3) Å3, space group P21/c, Z = 4, was solved using singlecrystalX-ray diffraction. Hydrogen atom positions were determined and the structure solution was refined to R1 = 3.31% and wR2 = 6.28% for the 2167 measured independent reflections. Three distinct cation sites host the Mg and Na atoms in distorted octahedra and eight-oordinated polyhedra. The coordination polyhedra share edges to form compact sheets oriented perpendicular to b and linked to one another by hydrogen bonds. This results in a {010} tabular habit. A comparison of this structure is made to that of blödite [Na2Mg(SO4)2¡¤4H2O], the dehydration product of konyaite. Konyaite is discussed within the context of the Na2O-MgO-SO4-H2O system. This study is part of ongoing investigations into the dehydration mechanisms and phase stability of this system. |
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×Ô¼º·µã£º²ÉÓÃXÉäÏßµ¥¾§ÑÜÉä¼ì²âÎåˮþÄÉ·¯Na2Mg(SO4)2•5H2OºÏ³É¾§Ì壬¾§°û²ÎÊý a=5.7690(8)£¬b=23.951(3)£¬c=8.0460(11)Å£¬¦Â=95.425(2)¡ã£¬V=1106.8(3)Å 3£¬P21/c¿Õ¼äȺ£¬Z=4¡£ °ËÃæÌå ¶àÃæÌå Ïà¶ÔÓ¦µÄ½á¹¹Îª°×ÄÆÃ¾·¯Na2Mg(SO4)2•4H2OÎåˮþÄÉ·¯µÄÍÑË®²úÎï¡£±¾ÎÄÔÚNa2O-MgO-SO4-H2OÌåϵÖжÔÎåˮþÄÉ·¯Éú³É¡£ ±¾ÎÄÊÇÎÒÃÇÕýÔÚÑо¿µÄNa2O-MgO-SO4-H2OÌåϵÍÑË®»úÀíºÍÏàÎȶ¨ÐÔµÄÒ»²¿·ÖÄÚÈÝ |
3Â¥2009-11-09 11:29:48
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ÎåË®Ã¾ÄÆ·¯µÄºÏ³É¾§Ìå½á¹¹£¬ Na2Mg(SO4)2¡¤5H2O,a = 5.7690(8), b = 23.951(3), c =8.0460(11)£»¦Â = 95.425(2)¡ã, V = 1106.8(3) Å3, ʹÓÃsinglecrystalX -ÉäÏßÑÜÉä½â¾öÁ˿ռäȺ P21/c£¬Z = 4¡£¶ÔÇâÔ×ÓµÄλÖýøÐÐÁ˲ⶨÒÔ¼°°Ñ²â¶¨¶ÀÁ¢·´¹âµÄ2167µÄ½â¾ö·½°¸Å¨ËõΪR1 = 3.31% and wR2 = 6.28%¡£ÈýÖÖ²»Í¬µÄÑôÀë×ÓλÖý«Mg ºÍ Na Ô×Ó¿ØÖÆÔÚ±»Å¤ÇúµÄ°ËÃæÌåºÍ8¸öе÷¶àÃæÌåÖС£Ðµ÷µÄ¶àÃæÌå¹²Ïí±ßÔµÒÔÐγɽô´ÕµÄ±»¸²£¬ÆäÈ¡Ïò´¹Ö±ÓÚb,ÒÔ¼°Í¨¹ýÇâ¼ü°ÑËüÃÇÒ»¸öÒ»¸öÁ¬½ÓÆðÀ´¡£Õâ¸ö½á¹ûʾÓÚ°å×´¹¹ÔìµÄ£¨010£©¹ßÏ°Ãæ¡£¶ÔÕâÒ»½á¹¹×÷³öµÄ±È½ÏÊÇΪÁ˶ÔblºÍouml½øÐбȽϣ»dite [Na2Mg(SO4)2¡¤4H2O]£¨Õâ¿ÉÄÜÊÇÒ»ÖÖ²úÆ·µÄÃû×Ö£©ÊÇÎåË®Ã¾ÄÆ·¯µÄÍÑË®²úÆ·¡£ÎåË®Ã¾ÄÆ·¯µÄÌÖÂÛ°üÀ¨ÔÚNa2O-MgO-SO4-H2OÌåϵµÄÄÚÈÝÖС£ÕâÏîÑо¿ÊÇÕýÔÚ½øÐеĶÔϵͳµÄÍÑË®»úÖÆºÍÏàÎȶ¨ÐÔµ÷²éµÄÒ»²¿·Ö¡£ ÓÉÓÚʱ¼ä²Ö´ÙºÍˮƽÓÐÏÞ£¬²»Í×Ö®´¦ÄÑÃ⣬¾´Çë¸÷λָÕý£¡ [ Last edited by »¨ÆøÏ®ÈË on 2009-11-9 at 11:42 ] |
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