1) Rietveld refinement
Rietveld拟合
2) Rietveld Refinement
Rietveld全谱拟合
1.
The Rietveld refinements of powder X-ray diffraction pattems show that all thesamples are sin.
通过Rietveld全谱拟合的方法分析，结果表明随掺杂浓度的增大，晶体的结构对称性没有发生变化，都成立方结构，空间群Im(?)。
2.
Results from Rietveld refinement of powder X-ray diffraction patterns showed that all samples were single phase with space group R 3 c and there were no structural phase transition for vacancy content x ranging from 0 to 0.
对粉末X射线衍射谱的Rietveld全谱拟合表明样品均为单相,在x=0到x=0。
3.
Rietveld Refinement of Cu doped La_(0.67)Ca_(0.33)MnO_3 crystal structure;
所有样品的X射线衍射结果用Rietveld全谱拟合的方法来分析。
3) Rietveld whole pattern fitting
Rietveld全谱拟合方法
4) Rietveld method
Rietveld法
1.
A sample of the Sb 2O 3 which contains both type of cubic Sb 2O 3 and orthorhombic Sb 2O 3 was performed quantitative phase analysis by Rietveld method.
用Rietveld法对含有立方和正交两种晶型的Sb2O3样品进行了定量相分析,该样品含立方晶型和正交晶型的Sb2O3分别为(质量分数)97。
2.
The crystalline structure of hydroxyapatite (HA) powders sintered at different temperatures of 600, 800, 1 000 and 1 200℃ was studied by means of X-ray diffraction and Rietveld method.
采用X射线衍射法和Rietveld法研究了羟基磷灰石(hydroxyapatite,HA)粉末在不同温度下烧结后的晶体结构,并对其进行结构模拟与解析。
3.
The X-ray diffraction (XRD) patterns were calculated analogically by using Rietveld method and the phase content in rare-earth two phase Nd2Fe14B/α-Fe magnet was determined based on standardless quantitative phase analysis.
用Rietveld法模拟计算稀土双相永磁合金Nd2Fe14B/α-Fe的X射线衍射谱(XRD),并根据多相体模型与无标定量相分析法确定各物相的含量。
5) Rietveld analysis
Rietveld分析
1.
XRD Rietveld analysis showed that such Fe2O3 was a mixture of crystalline γ - Fe2O3 and amorphous Fe2O3.
Fe~(3+)(Cr~(3-))/Fe~(2+)混合离子(M~(3+)/M_(2+)原子比为2:1)共沉淀法制备的Cr_2O_3掺杂量0～14％(质量分数)系列纳米氧化铁XRD Rietveld分析表明全是晶态γ-Fe_2O_3和非晶Fe_2O_3的混合物。
2.
75) alloys has been revealedby means of multi-phase Rietveld analysis.
75）的多相Rietveld分析表明，它是以C15型Laves相ZrM2为主的多相体系、不同M／Zr原子比（M=Nix或Mnl-x）非Laves相合金的出现与丰度和整个合金成分配比中Ni／Zr原子比的变化一致，并与Ni－Zr相图中具有同样Ni／Zr原子比的金属间化合物有相同的晶型。
6) Rietveld method
Rietveld方法
1.
For quantitative phase analysis of pure alumina and Al_2O_3-20wt%TiC composite,the Rietveld method was introduced.
Rietveld方法的定量分析具有准确、高效和快捷等优点,此方法适用于复合陶瓷材料的定量分析。
2.
The structure of samples has been investigated using the Rietveld method.
采用沉淀法制备了纳米氧化锌粉体,利用Rietveld方法对所得样品的结构进行了精修,结果显示所得纳米氧化锌为六方结构,空间群为p 63mc,其晶胞参数a=3。
3.
The XDWP was fitted by combining the Rietveld method and Fourier filtering technique, Rietveld structure refinement for PET_2 crystalline phase was done, the unit-cell parameters obtained such as a =(0.
联用Rietveld方法和Fourier过滤技术,首先以标准试样PbSO4的实测X射线衍射全谱图数据进行精修和分离,获得其结晶相结构参数和低本底值。
补充资料：非线性最小二乘拟合
分子式：
CAS号：
性质：用最小二乘法拟合非线性方程。有些变量之间的非线性模型，通过变量变换可以化为线性模型，此称为外在线性。而有些变量之间的非线性模型，通过变量变换不能化为线性模型，通称为内在非线性。对于非线性模型y=f(ξ,θ)+ε，其残差平方和。S(θ)是θ的函数，当模型关于θ是非线性的，正规方程关于θ也是非线性的。基于使残差平方和s(θ)达到极小的原理求出θ的估计值，拟合非线性回归方程。
CAS号：
性质：用最小二乘法拟合非线性方程。有些变量之间的非线性模型，通过变量变换可以化为线性模型，此称为外在线性。而有些变量之间的非线性模型，通过变量变换不能化为线性模型，通称为内在非线性。对于非线性模型y=f(ξ,θ)+ε，其残差平方和。S(θ)是θ的函数，当模型关于θ是非线性的，正规方程关于θ也是非线性的。基于使残差平方和s(θ)达到极小的原理求出θ的估计值，拟合非线性回归方程。
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参考词条