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[求助] 晶格常数a(Θ)和R(Θ)到底是啥

it is known that for a perfect crystal lattice, the dependence a(Θ) = f{r(Θ)} is linear, where a(Θ) is the lattice constant and r(Θ) is the raily function, both calculated for each peak of a xrd pattern from the crystal lattice. if not, the crystal lattice is distorted.as established, the dependences a(Θ) = f{r(Θ)} are variously nonlinear for different sd sets (the rotation option was applied in all cases).


请问各位大佬,晶格常数 a(Θ)和 r(Θ)raliy函数到底是啥?

a(Θ) = f{r(Θ)} 呈线性,a如何计算, r(Θ)如何计算,相关基础理论有什么参考文献或者书籍吗?


紧急求助

还有,Jade可以计算不
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