Study of the phase Equilibrium in the diagram system MnO2─NaVO3
Abstract
The importance of diagram system MnO2─NaVO3 is in obtaining a crystal phase (chemical compounds or solid solutions). Acknowledging the fact that these compounds have grade properties in the field of technology, it was important to study the possibility of obtaining new phases with different mole ratios, and to draw phase diagram for it, especially the used compounds in this study have different crystal structures.
The samples were made beginning from powders of reagent grade MnO2 and NaVO3 of 5gr for each of them at following percentage mole ratios of MnO2: (10, 20, 25, 30, 33.33, 50, 66.66, 70, 71, 75, 80, 90). The mixing and grinding process was made for these samples. Then, it made pills ellipsoidal using manually hydraulic press, and it burned into oven at different degrees. The study was made using powder X─Rays diffraction PXRD and different thermal analysis TG─ DTA. The results are compared with X─rays spectrums of grade compounds and parameters of it. Then, the formation phase changes degrees were determined. New compound was formed at ratio (MnO2)10(NaVO3)90 mole%, and crystal solid solution was formed to ratio (MnO2)25(NaVO3)75 mole%. As well solid solution (amorphous+ new compound) was formed until mole ratio (MnO2)75(NaVO3)25 mole%, and amorphous solid solution was formed beginning mole ratio (MnO2)80(NaVO3)20 mole%, then the phase diagram for the studied system was drawing.
Downloads
Published
How to Cite
Issue
Section
License

This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.
The authors retain the copyright and grant the right to publish in the magazine for the first time with the transfer of the commercial right to the Tishreen University Journal -Basic Sciences Series
Under a CC BY- NC-SA 04 license that allows others to share the work with of the work's authorship and initial publication in this journal. Authors can use a copy of their articles in their scientific activity, and on their scientific websites, provided that the place of publication is indicted in Tishreen University Journal -Basic Sciences Series . The Readers have the right to send, print and subscribe to the initial version of the article, and the title of Tishreen University Journal -Basic Sciences Series Publisher
journal uses a CC BY-NC-SA license which mean
You are free to:
- Share — copy and redistribute the material in any medium or format
- Adapt — remix, transform, and build upon the material
- The licensor cannot revoke these freedoms as long as you follow the license terms.
- Attribution — You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
- NonCommercial — You may not use the material for commercial purposes.
- ShareAlike — If you remix, transform, or build upon the material, you must distribute your contributions under the same license as the original.
- No additional restrictions — You may not apply legal terms or technological measures that legally restrict others from doing anything the license permits.