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New synthesis methods of MgAl2O4 spinel.
Topics include optical spectroscopy of transition metals in a-ZnAl2S4 wide band gap semiconductors; development of spinel NiZn ferrites for power field applications; spinel ferrites as catalysts for light alkanes combustion; application of magnesium spinel nanometric coating on aluminum oxide as an ionizing radiation sensor for personal and environmental dosimetry; chromium spinel oxides in high magnetic fields; the structural behavior of natural Cr-bearing spinels compared with synthetic ones; negative temperature coefficient thermistors based on spinel-type ceramics; and synthesis of high surface area MgAl2O4 spinel particles by a new method.
In this paper, the synthesis of ceramic spinel MgAl2O4 by starch assisted sol - gel process is presented. The gel mixture was prepared by using Mg(NO3)2.6H2O, Al(NO3)3.9H2O as precursors and starch as a gel agent. The study focused on relevant components of gel mixture and the calcinating temperature. The results showed that suitable molar proportion of Mg2+/Al3+; starch/(Mg2+ + Al3+) and H2O/starch were 0.5, 0.4 and 60, respectively. The calcination at 1100 oC for 60 minutes was suitable for forming phase of spinel. The product was a single phase of spinel MgAl2O4 with excellent crystallinity and uniform size in the range of 300 to 400 nm.
Low temperature synthesis of MgAl2O4 Spinel through …
Chemical synthesis and thermal evolution of MgAl2O4 spinel precursor prepared from industrial gibbsite and magnesia powder.- Materials Letters, 2002, 56(1/2): 97-101.
Tatumi, E scola Politécnica da Universidade de São Paulo, Electrical Engineering Department, São Paulo City, SP, Brazil, and others)
Chromium Spinel Oxides in High Magnetic Fields
(Shojiro Kimura, Masayuki Hagiwara, Institute for Materials Research (IMR), Tohoku University, Katahira, Aoba, Sendai, Miyagi, Japan, and others)
The Structural Behaviour of Natural Cr-Bearing Spinels Compared with Synthetic Ones
(Davide Lenaz, Francesco Princivalle, Department of Mathematics and Geosciences, University of Trieste, Trieste, Italy)
Negative Temperature Coefficient Thermistors Based on Spinel-Type Ceramics
Aimin Chang, Bo Zhang, Huimin Zhang, Jinbao Xu, Xinjiang Key Laboratory of Electronic Information Materials and Devices, Xinjiang Technical Institute of Physics and Chemistry, PR China)
Synthesis of High Surface Area MgAl2O4 Spinel Particles by a New Method
(Xiaoling Xu, Chunyi Li, Honghong Shan, State Key Laboratory of Heavy Oil Processing, China University of Petroleum (East China), Qingdao, Shandong, China)
Synthesis of MgAl2O4 Spinel Powder by Combination …
T1 - Synthesis of a double alkoxide precursor to spinel (MgAl2O4) directly from Al(OH)3, MgO, and triethanolamine and its pyroiytic transformation to spinel
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