International Journal of Advanced Research in

Science and Technology (IJARST)


Study of curious spiral like features in inverse spinel compound (Mg2TiO4)

Alok Kumar Singh*, Anju Dhillon, T.D.Senguttuvan and Azher M. Siddiqui

A B S T R A C T

Qandilite (Mg2TiO4) pellets have been made by conventional solid state reaction technique on sintering at 13000C. The main focus of this paper is on the morphological investigation of the inverse spinel (Mg2TiO4). The surface morphology of the sample (Mg2TiO4) is investigated by Scanning Electron Microscopy (SEM) which shows the occurrence of curious cubical growth characteristics resembling a spiral like features which have emanated from screw dislocations.


I N T R O D U C T I O N

The term spinel is derived from spina (Latin, thorn) in reference to its pointed octahedral crystal habit. Spinel compounds / Oxides are the group of minerals that are oxides of Magnesium, Iron, Manganese or Aluminum etc. The general chemical composition is AB2O4. A and B can be divalent (with radii between 80 and 110 pm), trivalent (with radii between 75 and 90 pm) or quadrivalent cations, including Magnesium, Zinc, Iron, Manganese, Aluminum, Chromium, Titanium, Silicon and Cobalt with the general formulation A2+B23+O42. A and B occupy some or all the octahedral and tetrahedral sites in the crystal lattice. Spinel oxides are the richest families having a number of compounds and diversity of observed physical properties such as ferromagnetic ordering, metal insulator transition, heavy fermion behavior, charge ordering and superconductivity [1-9]. Spinels are widely employed to deduce the evolutionary history of rocks because the compositions are extremely sensitive to environmental conditions of formation. Spinels also occur as semi-precious gems and are widely employed as mechanically robust ceramics. The minerals are strongly magnetic in nature, similar to magnetite. They are soluble in hot HCl, but only partially soluble in cold HCl, hot H2SO4 and HNO3.



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