Controlled rate thermal analysis of hydromagnesite

Thermogravimetric analysis and hot-stage Raman spectroscopy of cubic indium hydroxide

“…Therefore the aim of this research is to demonstrate the use of thermal analysis and hot stage Raman spectroscopy to assess the thermal stability of indium hydroxide, and to determine the changes in the molecular structure of the material as the indium hydroxide is thermally treated. Such research compliments the thermal analysis and differential thermogravimetric analysis of materials [22][23][24][25][26][27][28][29][30][31][32][33][34][35][36]. It is reported that many factors, such as disorder, size and shape distribution, can all influence the thermoanalytical properties and vibrational properties.…”

The influence of stearic acid coating on the properties of magnesium hydroxide, hydromagnesite, and hydrotalcite powders

“…In each case water, or water and carbon dioxide are released in gaseous form and inert oxides remain. 3 .MgO → 5MgO + 4CO 2  Scheme III: Degradation pathway for hydromagnesite [41][42][43][44].…”

Visible–near infrared spectra of hydrous carbonates, with implications for the detection of carbonates in hyperspectral data of Mars

“…Samples were also compared to VNIR spectra in the RELAB spectral library (http://www.planetary.brown.edu/relabdocs/relab_disclaimer.htm), USGS Spectral library (Clark et al, 2007) and published IR spectra (as indicated below) to assess composition. The lansfordite composition was assessed by heating the sample for 72 hours at 40°C and measuring the mass loss of water as lansfordite dehydrates to nesquehonite, which is stable at 40°C (Vágvölgyi et al, 2008). Our sample lost 11.6% water, which is 92% of the 12.6% predicted for the complete dehydration of ideal crystals.…”

“…Nesquehonite exhibits characteristic water-related absorptions at 1.0, 1.2, 1.4, and 1.9 µm m common to most hydrous salts and described above. There is some debate in the literature as to whether the formula of nesquehonite can be written as Mg(OH)(HCO 3 )•2H 2 O (e.g., Vágvölgyi et al, 2008), which affects the bands assignments for water. In nesquehonite the 1.2 µm feature is a shallow 1.17, 1.23 µm m doublet, likely ascribable to a combination of the H-O-H bending fundamental and the first overtone of the OH stretch Crowley, 1991).…”