An X-ray Study of the Factors causing Variation in the Heats of Solution of Magnesium Oxide

Calcination temperature-dependent surface structure and physicochemical properties of magnesium oxide

“…The straight lines of the calcined MgO at temperatures of 400 C and 500 C were almost horizontal, suggesting a lack of strain. [26][27][28] With the increase in the calcination temperature from 600 C to 900 C, the strain of the obtained samples gradually increased except there was a little variation for the sample from 1000 C. Derived from the slopes and intercepts, the strain and crystallite size of the samples are given in Fig. 7b.…”

“…For example, when the temperature was 700 C, the surface structure of the particle is composed of nanoparticles with sizes around 80 nm (Fig. [26][27][28]54 With the increase of the temperature from 800 C to 1000 C, the nanoparticles at the surfaces gradually grew from about 88 nm to 120 nm.…”

“…To quantitatively evaluate the strain and average crystallite size with temperature, a derived Scherrer equation was used. [26][27][28]54 b cos q ¼…”

“…22 Gai et al quantied the correlation between the catalytic reactivity and physicochemical properties of MgO from burning magnesium hydroxide-methoxide in the temperature range of 400-700 C, in which the surface polarisability demonstrated a converse trend relative to the catalytic reactivity with increase in calcination temperature. [26][27][28] Although the abovementioned studies are denitely favorable for gaining a deep insight into the effect of calcination temperature on the physicochemical properties of MgO, it still remains scarce how the surface structure and physicochemical properties of MgO with uniform size distribution and well-dened shape vary with temperature. 24 Pathak and Moorthy studied the inuence of calcination temperature on the morphologies of MgO powders from different organic salts, and noticed that the products derived from acetate, tannate, oxinate and formate were prone to be highly sinterable with temperature, whereas the powders from oxalate, succinate and phthalate were poorly sinterable.…”

“…25 To quantitatively describe the sintering level of MgO from high temperatures, a convenient graphical method for expressing the relationship between crystallite dimension and strain function was described by plotting b cos q against sin q from X-ray diffraction data. [26][27][28] Although the abovementioned studies are denitely favorable for gaining a deep insight into the effect of calcination temperature on the physicochemical properties of MgO, it still remains scarce how the surface structure and physicochemical properties of MgO with uniform size distribution and well-dened shape vary with temperature. As well-known, the importance of well-dened ne particles has been recognized in numerous applications, such as in ceramics, catalysis, separation, pigments, recording materials, medical diagnostics, and many others.…”