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ÎÒµç¶ÆÖÆ±¸NiCoÍ¿²ã£¬ÏÈÓÃÄâºÏ¶ÔÖ÷·å½øÐÐÄâºÏ·ÖÎö£¬È»ºóͨ¹ýлÀÕ¹«Ê½¼ÆËã¶Ô·Ö±ð¶ÔniºÍcoµÄÖ÷ÒªÏà½øÐо§Á£³ß´ç¼ÆË㣬µ«Éó¸åÈËÈÏΪCo Ó¦ÈܽâÔÚNi ÖУ¬ÒÔÉú³É¾ßÓд¿ Ni£¨¼´ fcc£©Ïàͬ¾§¸ñ½á¹¹µÄ Ni-Co ¹ÌÌåÈÜÒº¡£µ«ÊÇ£¬ÓÉÓÚCo µÄÔ×Ó°ë¾¶´óÓÚ Ni£¬Òò´ËÔ¤ÆÚNi ·åλÖã¨Ïà¶ÔÓÚ jcpds ¿¨£©µÄλÖûáÏò×óÒÆ¶¯¡£Õâ²¢²»Òâζ×Å´æÔÚ¾ßÓÐ fcc ¾§¸ñ½á¹¹µÄ Co Ï࣡CoµÄ¾§¸ñ½á¹¹ÈÔÈ»ÊÇhcp£¬ÆäŨ¶È¿ÉÄܸßÓÚ±¥ºÍ¶È¡£Í¬Ê±co ¾ßÓÐ hcp ¾§¸ñ£¬Òò´Ë£¬ÆäÆ½ÃæÓ¦³ÊÏÖΪ £¨10.0£© ºÍ £¨10.1£©£¬¶ø²»ÊÇ £¨100£© ºÍ £¨101£©¡£ ÎÒµ½µ×¸ÃÔõôȥ¼ÆËãºÏ½ðÍ¿²ãµÄ¾§Á£³ß´ç£¬»¹Óо§Ãæ±í´ïÊÇ£¨10.0£©ºÍ £¨10.1£©µÄÕâÖÖ¼ÓµãµÄ·½Ê½Ã´£¿ ÒÔÏÂÊÇÉó¸åÈ˵ÄÒâ¼û£º 1- in phase analysis of ni-co alloy using xrd technique, the authors believe that ni and co phases are present together with an fcc lattice structure. this idea is also presented in fig. 9. according to the ni-co phase diagram, co should dissolve in ni to produce a ni-co solid solution with the same lattice structure of pure ni (i.e., fcc). however, since the atomic radius of co is larger than ni, a left shift in positions of ni peaks (relative to jcpds cards) is expected. this does not mean that a co phase with fcc lattice structure is present! the lattice structure of co remains hcp, and it could present at concentrations higher than the saturation one. 2- co has an hcp lattice, and thus, its planes should be presented as (10.0) and (10.1), not as (100) and (101). 3- for determining the crystallite size using scherrer formula, beta is the peak broadening and not the fwhm of the diffraction peaks. this parameter should be calculated by subtracting the instrumental widening from that of the fwhm. for this reason, strange values of crystallite size (15-50 nm) are reported by the authors. indeed, if any peaks relating to ni (fcc) are considered for the crystallite size calculation, this cannot be correct (see comment # 1). ΢ÐŽØÍ¼_20200719211003.png@comma@wacky1980 |
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