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Development of Novel Synthetic Methodologies Characterization and Studies on Magnetic and Surface Properties of Some Binary and Ternary Transition Metal Nitrides

Shodhganga@INFLIBNET

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Title Development of Novel Synthetic Methodologies Characterization and Studies on Magnetic and Surface Properties of Some Binary and Ternary Transition Metal Nitrides

 
Contributor Rabi Narayan Panda
 
Subject quotPhysics, Novel Synthetic, Magnetic and Surface Properties, Metal Nitridesquot
 
Description Transition metal nitrides are technologically important because of their unique physical and chemical properties. Research on metal nitrides is scanty, due to their synthetic
newlinedifficulty. Also, the stability of the metal nitrides is a matter of concern, as most nitrides are sensitive to oxygen and form oxides in air atmosphere. Therefore, studies on metal nitrides are not explored much. The present study investigates novel synthesis, characterization techniques, surface and magnetic properties study of nitrides such as: and#949;- CoxFe3-xN (0 and#8804; x and#8804; 0.4), and#947;and#8242;-NixFe4-xN (x = 0.2, 0.4, 0.6, 0.8), VN, and#947;-Mo2N, and#947;-CoxMo2-xN(x= 0.25), and#946;-W2N and CoWN2 materials. Various novel synthetic routes have been developed and adopted to obtain the above mentioned nitrides as pure phase nano-structures. The observed properties
newlinehave been correlated to the size, shape and structure of the materials. Size and surface
newlineeffects become predominant at nano scale leading to variation in intrinsic properties, which is evident in our research findings.
newlineand#949;-Fe3N and and#947;and#8242;- Fe4N materials have been synthesized via citric acid assisted sol-gel
newlinemethod. The effect of Co substitution on structural and magnetic properties of and#949;-phase iron nitride has been studied in detail. and#949;- CoxFe3-xN (0 and#8804; x and#8804; 0.4) materials crystallize in hexagonal crystal structure with values of lattice parameters in the range of a = 4.772 -4.783 Å and c = 4.413 - 4.423 Å. The crystallite sizes of the products are estimated to be in the range of 44 - 55 nm. For and#949;-Co0.1Fe2.9N nitride, and#947;and#8242;-Fe4N phase along with and#949;-Fe3N phase was observed in the XRD pattern. With gradual increase of Co content (x) to 0.2 at wt%, and#949;-Fe3N phase was stabilized. However, with further increase of Co content (x) upto 0.3 and 0.4 at wt%, small amount of and#945;-Fe precipitation in the nitride product as impurity phase was obtained. It is observed that with increasing Co substitution, the lattice parameters as well as the crystallite sizes of and#949;- CoxFe3-xN (0 and#8804; x and#8804; 0.4) system increases in a systematic manner.The average SEM par

 
Date 2018-10-18T04:49:43Z
2018-10-18T04:49:43Z
01/07/2013
2018
01/08/2018
 
Type Ph.D.
 
Identifier http://hdl.handle.net/10603/219201
 
Language English
 
Relation
 
Rights university
 
Format 193p.

DVD
 
Coverage
 
Publisher Pilani
Birla Institute of Technology and Science
Physics
 
Source University