পদ্ধতির তুলনা করুন

	এক্সআরডি রিটভেল্ড পরিমার্জন	নির্বাচিত এলাকা ইলেকট্রন ডিফ্র্যাকশন
ক্ষেত্র	উপাদান বিজ্ঞান	উপাদান বিজ্ঞান
পরিবার	Process / pipeline	Process / pipeline
উদ্ভবের বছর	1969	1913
প্রবর্তক	Hugo Rietveld	Georges Friedel
ধরন	Refinement method	Diffraction technique
মৌলিক উৎস	Rietveld, H. M. (1969). A profile refinement method for nuclear and magnetic structures. Journal of Applied Crystallography, 2(2), 65-71.	Williams, D. B., & Carter, C. B. (2009). Transmission Electron Microscopy: A Textbook for Materials Science (2nd ed.). Springer.
অপর নাম	Rietveld refinement, powder diffraction refinement	SAED, electron diffraction pattern, TEM diffraction
সম্পর্কিত	3	3
সারসংক্ষেপ	XRD Rietveld Refinement is a method for extracting detailed crystal structure information from powder diffraction data by comparing observed and calculated diffraction patterns through least-squares refinement. Developed by Hugo Rietveld in 1969, this technique enables determination of atomic positions, occupancies, thermal parameters, and phase fractions directly from powder data without requiring single crystals. It is the standard approach in materials characterization for structural analysis, phase identification, and quantification.	Selected Area Electron Diffraction (SAED) is a crystallographic technique in transmission electron microscopy that obtains electron diffraction patterns from micron-sized or sub-micron crystalline regions. Developed from fundamental principles of electron wave behavior and integrated into TEM instruments by the mid-20th century, SAED enables direct observation of reciprocal space, crystal symmetry, and defect structures with spatial resolution unattainable by X-ray diffraction. It is essential for studying local crystal structure, phase identification, and characterizing nanoscale materials.