I prepared two ferrite thin films at two different calcined temperature with same condition.
My experience with zeolites and metal oxides shows that the temperature influences strongly optical properties and thickness of thin films. However, there is a temperature above which the changes are negligible. See the attached papers
Yes, the calcination temperature affects the thickness of the film, if the process is really a calcination, not sintering one.
The thickness of the ferrite films vary with the variation of calcination conditions like Holding temperature(C), Temperature rise rate( C/ min) and Holding time(minutes).
For example: The spinel MgFe2O4 thin films has thickness o.648 μm at 400C and 1.473 μm at 700C. This increase in thickness with the increase in temperature is due to the increase in crystallite size . For example the above named ferrite has size=10nm at 400C and 15 nm at 700C with a slight improvement of cryatallinity of the films.
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Calcination of ferrites
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1. Patent EP2645383A2 - Method of forming ferrite thin film ...
www.google.com/patents/EP2645383A2?cl=en
Oct 2, 2013 - [Task] To provide a method of forming a ferrite thin film in which it is ... of the calcined film on the substrate becomes a desired thickness, and ...
Calcination step is one of the stages encountered in ceramic processing, and is normally used in ceramic processing.
In case of thin film preparation - heat treatment/annealing/pyrolysis step are some of the terms normally used.
In ceramic processing When the raw mixed powders are subjected to a preliminary reaction, and in case they contain any carbonates etc., they are converted to oxides, and similarly other oxides can be converted to sub oxides, and the volatile element are removed.
In thin films are you having any reacted products which are going out during the heat treatment .
Are you making the ferrite thin film from nitrates, etc., through some chemical reaction.
Or forming Ferrite thin films using the col gel techniques (because here you may have a number of carbonaceous products).
Defintely there will be a shrinkage of the film, once you depossted them by spray pyrolysis/spin casting/dip coating, and this can affect the thickness of the film, and also develop cracking in the film.
K. Sreenivas
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