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Barium monoferrite BaFe 2 O 4 classified as permanent magnet stands out among other ceramic magnets due to its high chemical stability, corrosion resistance and low production cost. In addition, experiments conducted on photocatalytic degradation of methyl orange and UV transmittance by spectrophotometry have shown that this material has photocatalytic properties. The spinel ferrite is of importance in many technological areas such as computing, communications and security. Several techniquesdoi:10.1590/s1516-14392011005000069 fatcat:vlivcsknpnaeziqmdoxolwjude