Related Experiment Video
Updated: Aug 17, 2026

Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
Published on: June 7, 2018
Refinement of the crystal structural parameters of La2/3Ca1/3MnO3 using quantitative convergent-beam electron
Fang Feng1, Jing Zhu, Aihua Zhang
1Electron Microscopy Laboratory, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, People's Republic of China.
Abstract:
Crystal structural parameters (seven positional parameters and four isotropic Debye-Waller factors) of La(2/3)Ca(1/3)MnO(3) have been refined using the quantitative convergent-beam electron diffraction (QCBED) method. Using intensity information of many higher-order Laue-zone reflections simultaneously is essential to refine structural parameters accurately. The effective global optimization algorithm was used to avoid the problems of input values and local minima. The fittings of the differential coefficients of one-dimensional experimental intensities and theoretical ones calculated by the dynamical diffraction theory were carried out with the normalized Euclidean distance criterion. Thus, all of these improve the accuracy and reliability of the analysis. The calculated results with the refined parameters agree with the experiments. The refined parameters also agree with the Rietveld refinement results of neutron diffraction.
More Related Videos
Related Concept Videos
Determination of Crystal Structures
X-ray Crystallography
Diffraction
Diffraction is the change in the direction of travel experienced by an electromagnetic wave when it encounters a physical barrier whose dimensions are comparable to those of the wavelength of the light. X-rays are electromagnetic radiation with wavelengths about as long as the distance between neighboring...
Imperfections in Crystal Structure: Stoichiometric Point Defects

