Rietveld refinement 18 Rietveld analysis 8 X ray diffraction 8 goethite 8 X-ray diffraction 6 Acid dissolution 4 Hyperfine characterization 4 Mossbauer spectroscopy 4 Mössbauer spectroscopy 4 Nickel compounds 4 Scanning electron microscopy 4 Ssbauer spectroscopies 4 article 4 cobalt 4 dissolution 4 hematite 4 manganese 4 nitrate 4 phase transition 4 Adsorption 2 Al- 2 Alkalinity 2 Aluminum 2 Ambient pressures 2 Anisotropic broadening 2 Anti-Bacterial Agents 2 Antibiotic 2 Antibiotics 2 Atomic emission spectroscopy 2 Atomic parameters 2