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| Termogravimetrisk analyse× | XRD Rietveld-raffinering× | |
|---|---|---|
| Fagområde | Materialevidenskab | Materialevidenskab |
| Familie | Process / pipeline | Process / pipeline |
| Oprindelsesår≠ | 1960s | 1969 |
| Ophavsperson≠ | William W. Wendlandt | Hugo Rietveld |
| Type≠ | Characterization method | Refinement method |
| Oprindelig kilde≠ | Wendlandt, W. W. (1986). Thermal Analysis (3rd ed.). John Wiley & Sons. link ↗ | Rietveld, H. M. (1969). A profile refinement method for nuclear and magnetic structures. Journal of Applied Crystallography, 2(2), 65-71. DOI ↗ |
| Aliasser≠ | TGA, thermal gravimetry, thermogravimetry | Rietveld refinement, powder diffraction refinement |
| Relaterede | 3 | 3 |
| Resumé≠ | Thermogravimetric Analysis (TGA) is a thermal characterization technique that continuously measures mass loss or gain of a material as a function of temperature (or time at constant temperature). Developed systematically by William Wendlandt and colleagues in the 1960s, TGA identifies thermal transitions (evaporation, decomposition, oxidation, reduction) and quantifies composition of polymers, pharmaceuticals, ceramics, and other materials. The derivative signal (DTG) highlights transition temperatures. When combined with gas analysis (MS, FTIR), decomposition products are identified. | 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. |
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