Abstract
Nowadays, thermal plasma is one of the upcoming technologies used for the synthesis of magnetic nanoparticles. Plasma is a fourth state of matter alongside solid, liquid, and gases. Quasi-neutral gas of charged particles (electrons and ions) and neutrals particles (atoms or molecules) characterized by their collective behavior is known as plasma. Thermal plasma technology is widely used for technology-oriented materials processing applications such as plasma cutting, spraying, sintering, melting, welding, waste management, ore segregation, alloy formation, etc. Tremendous thermal flux associated with the plasma plume enhances its applicability manifold. It is possible to achieve the temperatures of the order of 5 × 103 K to well above 10 × 103 K with a well-stabilized arc. In comparison, the conventional heat sources can attain temperature only up to 3000K. This facilitates high-temperature chemical reactions and extractive metallurgy (e.g., formation of oxides of ceramic materials). Here emphasis is given on the various features of thermal plasma processing technology and the way in which these plasmas can contribute to the advancement of the frontiers of materials-development capabilities. As an example of magnetic materials thermal plasma processing of few selected systems viz. CoFe2O4, (Ni-Co)Fe2O4 are discussed in detail whereas processing of other magnetic system is mentioned in the present chapter.
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