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Papers by sandra da silva marins
Journal of Materials Science, 2011
Synthesis of manganese-zinc ferrite by powder mixing using ferric oxide from a steel mill acid re... more Synthesis of manganese-zinc ferrite by powder mixing using ferric oxide from a steel mill acid recovery unit 1 2 3 Your article is protected by copyright and all rights are held exclusively by Springer Science+Business Media, LLC. This e-offprint is for personal use only and shall not be selfarchived in electronic repositories. If you wish to self-archive your work, please use the accepted author's version for posting to your own website or your institution's repository. You may further deposit the accepted author's version on a funder's repository at a funder's request, provided it is not made publicly available until 12 months after publication.
Journal of Alloys and Compounds, 2007
An investigation was made into the synthesis and magnetic properties of Tb(3−x)YxFe5O12 garnet fe... more An investigation was made into the synthesis and magnetic properties of Tb(3−x)YxFe5O12 garnet ferrite synthesized by coprecipitation from hydrated chlorides of rare-earth elements and ferrous sulfate. The mixed hydroxide coprecipitate was calcined at 1000°C. Ring-shaped compacts were obtained by dry pressing of finely milled calcined coprecipitate powder to which an aqueous solution containing 15wt% of PVA was added. The compacts
Materials Letters, 2007
The free energy of formation for Mn 0.5 Zn 0.5 Fe 2 O 4 has been determined based on thermodynami... more The free energy of formation for Mn 0.5 Zn 0.5 Fe 2 O 4 has been determined based on thermodynamic equilibrium of the Mn-Zn-Fe-H 2 O system under conditions prevailing in the hydrothermal synthesis experimental work published recently by other authors. The equilibrium diagrams generated in this work have been used to interpret published experimentally observed results on manganese-zinc ferrite synthesis and behavior during cooling. The conclusion is that all experimental results and problems concerning the thermodynamic behavior of the system Mn-Zn-Fe-O during synthesis and cooling down are perfectly explained by the prediction of the equilibrium diagrams developed in this work. Moreover, further benefits will arise from feeding the free energy data provided here into the computational thermodynamics softwares to generate equilibrium diagrams that are not yet available involving this type of ferrite.
Journal of Materials Science, 2011
Synthesis of manganese-zinc ferrite by powder mixing using ferric oxide from a steel mill acid re... more Synthesis of manganese-zinc ferrite by powder mixing using ferric oxide from a steel mill acid recovery unit 1 2 3 Your article is protected by copyright and all rights are held exclusively by Springer Science+Business Media, LLC. This e-offprint is for personal use only and shall not be selfarchived in electronic repositories. If you wish to self-archive your work, please use the accepted author's version for posting to your own website or your institution's repository. You may further deposit the accepted author's version on a funder's repository at a funder's request, provided it is not made publicly available until 12 months after publication.
Journal of Alloys and Compounds, 2007
An investigation was made into the synthesis and magnetic properties of Tb(3−x)YxFe5O12 garnet fe... more An investigation was made into the synthesis and magnetic properties of Tb(3−x)YxFe5O12 garnet ferrite synthesized by coprecipitation from hydrated chlorides of rare-earth elements and ferrous sulfate. The mixed hydroxide coprecipitate was calcined at 1000°C. Ring-shaped compacts were obtained by dry pressing of finely milled calcined coprecipitate powder to which an aqueous solution containing 15wt% of PVA was added. The compacts
Materials Letters, 2007
The free energy of formation for Mn 0.5 Zn 0.5 Fe 2 O 4 has been determined based on thermodynami... more The free energy of formation for Mn 0.5 Zn 0.5 Fe 2 O 4 has been determined based on thermodynamic equilibrium of the Mn-Zn-Fe-H 2 O system under conditions prevailing in the hydrothermal synthesis experimental work published recently by other authors. The equilibrium diagrams generated in this work have been used to interpret published experimentally observed results on manganese-zinc ferrite synthesis and behavior during cooling. The conclusion is that all experimental results and problems concerning the thermodynamic behavior of the system Mn-Zn-Fe-O during synthesis and cooling down are perfectly explained by the prediction of the equilibrium diagrams developed in this work. Moreover, further benefits will arise from feeding the free energy data provided here into the computational thermodynamics softwares to generate equilibrium diagrams that are not yet available involving this type of ferrite.