The structure studies were performed on tree nanocrystalline MgO powders prepared by sol-gel technique, which produce high purity, chemically homogeneous materials with relatively high specific surface areas. Magnesium methoxide was used as MgO precursor. The wet gels were dried under different conditions to prepare a hydrated form of MgO. The applied dry conditions yielded two aerogels and one xerogel with periclase phase, the only crystalline form of magnesium oxide.

The X-ray diffraction and scanning electron microscopy were used as the tools of structure analysis. The Toraya PRO-FIT procedure and Rietveld refinement method were applied at X-ray data analysis. PRO-FIT procedure enables the determination of parameters of individual diffraction lines and applies Pearson VII function for the description of line profiles. This function appeared to be the most useful also at Rietveld refinement procedure.

The average crystallite size of the studied MgO powders estimated from Scherrer formula was in the range 5.5 - 7.5 nm. The crystallite size distributions were also determined using FW(1/5 and 4/5)M method proposed by R. Pielaszek. The obtained at Rietveld refinement R_wp, R_exp and S fitting parameters, seem to be satisfactory due to the nanosize of MgO crystallites and since the presence of small amount of amorphous phase is very probable.

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1. Initial abstract
2. 2nd abstract
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4. Reliable XRD characterization in production or high-throughput laboratory regime
5. Precipitations of tungsten in quasicrystalline Al-Cu-Fe-W alloys
6. Localization of rare-earth dopants in the lattice of nanocrystalline ZrO₂ - EXAFS study
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8. Texture analysis of hot rolled Ni-Mn-Ga alloys
9. X-ray and electron microscopy techniques studies on nanocrystalline MgO powder materials prepared by sol-gel method
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11. Error bars in powder diffraction
12. Characterization of nanopowders
13. Materials with multimodal hierarchical porosity
14. Effect of deformation on structure and mechanical behavior of plycrystalline Ni-Mn-Ga alloys
15. Structure of nanocrystalline powders of MgO prepared by sol-gel method
16. Microwave technique applied on the hydrothermal synthesis and sintering of calcia stabilized zirconia nanoparticles
17. The effect of γ-phase particles on microstructure and properties of Co-Ni-Ga alloys
18. Localization of rare-earth dopants in the lattice of nanocrystalline ZrO₂ - EXAFS study
19. Characterization of nanocrystalline ZrO₂ doped with Rare-Earth elements synthesized via High Pressure Hydrothermal Method
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21. Investigations of phase composition and grain size distribution in Pr doped ZrO2
22. Morphology of Al doped zinc oxide obtained by the vapour condensation method
23. Accuracy of XRD size measurements of nanocrystals
24. Morphology of Al-Doped Zinc Oxide Obtained by the Vapour Condensation Methods
25. Application of XRD diffraction methods for determination of grain size distribution in nanoparticles
26. X-ray analysis of ground NiAl-Cr₃C₂-Al₂O₃ composite powders with nanocrystalline NiAl phase
27. Grain Size and Grain Size Distribution of Nanocrystalline Pr-doped Zirconia Powders Obtained in High Pressure Microwave Reactor
28. Measuring the Grain Size Distribution of Pr-doped Zirconia Nanopowders obtained by Microwave Driven Hydrothermal Synthesis
29. Microstructure of Ni(Cr)-Cr₃C₂ -Cr₇C₃ -TiC composite powder
30. Analytical expression for Diffraction Line Profile for polydispersive powders
31. FW1/5-4/5M method for determination of the Grain Size Distribution from powder diffraction line profile
32. Dyfrakcyjne badania mikrostruktury polikryształów nanometrowych poddawanych działaniu wysokiego ciśnienia
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35. X-Ray Characterization of Nanostructured Materials
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37. Influence of high pressure on the polytype structure of nanocrystalline GaN
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