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Register a new userStudy of the phase Equilibrium in the diagram system MnO2─NaVO3
دراسة توازن الأطوار في الجملة الثنائية MnO2─NaVO3
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Tishreen University ورقة بحثية
Publication date
2017
fields
Chemistry
and research's language is
العربية
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Shamra Editor
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تكمن أهمية الجملة الثنائية MnO2─NaVO3 في الحصول على أطوار بلورية (مركبات كيميائية أو محاليل صلبة), باعتبار أن هذه المركبات ذات خواص نوعية في مجال التكنولوجيا, لذلك كان من المهم دراسة إمكانية الحصول على أطوار جديدة عند نسب مولية مختلفة, و رسم مخطط توازن الأطوار لها, لاسيما أنّ المركبات المستخدمة في هذه الدراسة تملك بنى بلورية مختلفة. حضرت العينات ابتداءً من مساحيق المواد الأولية (MnO2,NaVO3 ) في 5gr لكل منها عند النسب المولية المئوية التالية من MnO2: (10, 20, 25, 30, 33.33, 50, 66.66, 70, 71, 75, 80, 90), و أجريت عمليات الخلط و الطحن اليدوي لهذه العينات, ثم حضرت على شكل أقراص باستخدام مكبس هيدروليكي يدوي, و سخنت في المرمدة عند درجات حرارة مختلفة, و أجريت الدراسة باستخدام جهاز انعراج الأشعة السينية من المسحوق PXRD, و جهاز الحرارة التفاضلي TG─DTA, و تمت مقارنة النتائج مع طيوف الأشعة السينية للمواد الأولية النقية, و البارامترات الخاصة بها, ثم حدّدت درجات حرارة التغيرات الطّوريّة المتشكلة, حيث تشكّل مركب جديد عند النسبة (MnO2)10(NaVO3)90 مول%, و محلول صلب بلوري حتى النسبة (MnO2)25(NaVO3)75 مول%. كما تشكّل محلول صلب (أمورف+ المركب جديد) حتى النسبة المولية (MnO2)75(NaVO3)25 مول%, و محلول صلب أمورف ابتداءً بالنسبة المولية (MnO2)80(NaVO3)20 مول%, و رسم المخطط الطّوري للجملة المدروسة.
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.
References used
GARIB, A. J. A. JESÚS, S. D. F. MIRÓ, B. A. M. and HERNÁNDEZ, H. S. Synthesis of NiMn2O4 assisted by high-energy ball milling of NiO-MnO powders. Journal of Ceramic Processing Research. 12(6), 2011, 721–726
FUJIMOTO, K. SHIMURA, Y. and ITO, SH. Establishment of Pseudoternary LiO0.5−NiO−MnO2 Phase Diagram by Combinatorial Wet Process. ACS Combinatorial Science. 21, 2013, A−D
GUO, J. LIU, Q. WANG, C. and ZACHARIAH, M. R. Interdispersed Amorphous MnOx–Carbon Nanocomposites with Superior Electrochemical Performance as Lithium-Storage Material. Materials Views. 22, 2012, 803–811
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