Synthesis of MgAl2O4 by Gelatin Method: Effect of Temperature and Time of Calcination in Crystalline Structure

Abstract

Magnesium aluminate can be obtained by the methods: ceramic method, sol-gel, co-precipitation, hydrothermal and combustion. However, this work presents a simple and low cost route to obtain MgAl 2 O 4 through the gelatin method. The main objective was to use gelatin as an organic precursor and to verify the influence of temperature and time of calcination on the structural and morphological properties of obtained materials. Al and Mg nitrates were used as metal precursors with Al/Mg = 2 ratio. Samples were calcined as follows: 700 ºC, 900 ºC and 1100 ºC during 2 and 4 h. The powders were characterized by TGA, XRD and SEM. A single phase material with a crystallinity of 39.18-90.40% and crystallite size in the range of 12.4 to 55.5 nm was obtained. The materials exhibited morphology in the form of plates and small agglomerates. It was found that increasing temperature and time of calcination favored the growth of crystallites and increased crystallinity.

Effects of Aluminum Oxide Addition on Electrical and Mechanical Properties of 3 mol% Yttria-Stabilized Tetragonal Zirconia Electrolyte for IT-SOFCs

“…Figure S2: Dilatometric curves for two series of powders after 1 h of calcination in air at 873 K. Figure S3: Tetragonality of the t 1 and t 2 tetragonal phases as a function of alumina content for the two investigated series of sinters. Figure 4S: Mean size in samples sintered for 2 h in air at 1773 K as a function of alumina content: (a) grains of the 3Y-TZP matrix and (b) Al 2 O 3 inclusions; Table S1: Temperature ranges associated with expansion and shrinkage, as determined for two series of powders after 1 h of calcination in air at 873 K. Table S2: Activation energy of conduction with respect to total conductivity (E a(tot) ) as well as grain interior (E a(b) ) and specific grain boundary conductivity (E a(sp.gb) ), as calculated for the studied 3Y-TZP and 3Y-TZP/Al 2 O 3 samples obtained after 2 h of sintering in air at 1773 K. Refs [ 68 , 69 , 70 , 71 , 72 ] are cited in the SM.…”

Study of ZnAl2O4 spinel nanoparticles synthesized using gelatin as organic precursor

“…The process is an alternative simple, low-cost and environmentally friend method, which produces nano-sized powders with high purity, homogeneity and good control of stoichiometry. Recent studies have used gelatin as a polymerization agent to produce mixed oxides with spinel [21][22][23] and perovskite [24][25][26] structures. Thus, the aim of this work was to synthesize zinc aluminate nanoparticles using gelatin as an organic precursor and to evaluate the effect of different temperatures of calcination on the structural, morphological and textural properties of the materials.…”