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ÎÒ×öµÄÊǹØÓÚ La2CaB10O19£¬Õâ¸ö»¯ºÏÎïÊǵ¥Ð±¾§Ïµ£¬C2¿Õ¼äȺ£¬LaÊÇÊ®ÅäλµÄ£¬¸ÆÊǰËÅä룬 La2CaB10O19 is a biaxial single crystal which belongs to the monoclinic system with space group C2 with two formula units per cell.2 The lattice parameters of LCB crystal are a=11.043 Å, b=6.563 Å, c=9.129 Å, ¦Á =¦Â =90¡ã, and ¦Ã=91.47¡ã. The LCB crystal is a member of the newly synthesized NLO borate crystals RCB £¨R2CaB10O19£© family, where R represents rare-earth elements.10 LCB is absolutely insensitive to moisture, and has a hardness of 6.5 Mohs, allowing easy cutting and optical polishing.2 The crystal structure contains B5O12 double-ring pentaborate groups, which are linked together forming infinite two-dimensional double layer. The layer is situated almost perpendicularly to the c axis of the crystal. The La atoms are located in layers, while Ca atoms are located between two layers ÎÒÏëÇë½ÌµÄÊÇLaλÖþßÓÐʲô¶Ô³ÆÐÔ£¬»¹ÓÐCa¾ßÓÐʲô¶Ô³ÆÐÔ£¬ÒªÖªµÀÕâ¸öµÄ»°£¬ÐèҪʲôÊý¾Ý£¡ лл£¡ [ Last edited by lanlee on 2007-9-26 at 17:32 ] |
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