本人在一本资料上看到,Blue pigments based on CoxZn1xAl2O4 spinels synthesized by the polymeric precursor method fig2
对于纳米级,随着晶胞参数的增大,晶粒尺寸有规律的减小,关于这一点还有一个定律:Vegard’s law ,但不知这个定律的具体内容及原理,请高手赐教
因果关系我不确定,因为不知其原理。原文相应的一段如下:
Accompanying the increasing tendency shown in the theoretical
values for the lattice parameters of ZnAl2O4 (8.05 Å and CoAl2O4
(8.106 Å, the experimental values of lattice parameters and unit
cell volume gradually increase upon the Co-substitution from zinc,
from 8.083 Å to 8.095 Å in the case of lattice parameter, and from
528.10 Å3 to 530.45 Å3 in the case of unit cell volume. Such raise in
the unit cell is in agreement with the values from ICDD files, Fig.1. It
should be stressed that the formation of a nanocrystalline structure,
with the further reduction in the mean crystallite size upon
the Co-enrichment, diminishing its value from 38.1 nm to 22 nm. It
should be remarked that these two properties fairly obey Ve´ gard’s
law reasonably closely, with the corresponding linear relationship
of lattice parameter and crystallite size with the Co-enrichment of
the system, Fig. 2.
wangshasha 看来是高手.
不过一般情况下磨得再细也不至于破坏晶体吧.
根据个人实验结果,他们之间没啥必然联系。
本人在一本资料上看到,Blue pigments based on CoxZn1xAl2O4 spinels synthesized by the polymeric precursor method fig2
对于纳米级,随着晶胞参数的增大,晶粒尺寸有规律的减小,关于这一点还有一个定律:Vegard’s law ,但不知这个定律的具体内容及原理,请高手赐教
因果关系似乎应该倒过来,希望可以看到原文中的部分相关文字。
因果关系我不确定,因为不知其原理。原文相应的一段如下:
Accompanying the increasing tendency shown in the theoretical
values for the lattice parameters of ZnAl2O4 (8.05 Å and CoAl2O4
(8.106 Å, the experimental values of lattice parameters and unit
cell volume gradually increase upon the Co-substitution from zinc,
from 8.083 Å to 8.095 Å in the case of lattice parameter, and from
528.10 Å3 to 530.45 Å3 in the case of unit cell volume. Such raise in
the unit cell is in agreement with the values from ICDD files, Fig.1. It
should be stressed that the formation of a nanocrystalline structure,
with the further reduction in the mean crystallite size upon
the Co-enrichment, diminishing its value from 38.1 nm to 22 nm. It
should be remarked that these two properties fairly obey Ve´ gard’s
law reasonably closely, with the corresponding linear relationship
of lattice parameter and crystallite size with the Co-enrichment of
the system, Fig. 2.
[ Last edited by sdluxi on 2009-8-31 at 10:51 ],
我也觉得 不管怎么磨 破坏晶粒 这个我觉得几乎不可能
我见过做定量分析的制样
用研磨机
必须控制好转速和研磨时间
否则肯定会破坏晶粒……
还能磨过头磨成非晶啊,不至于吧,就算其中有一颗被磨成非晶了,也不可能都被磨成非晶 以至于出不了相应的衍射峰吧