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Study of the equilibriums phases in the binary system for Sodium molybdate and lead molybdate (Na2MoO4– pbMoO4)

دراسة توازنات الأطوار في الجملة الثنائية لموليبدات الصوديوم و موليبدات الرصاص Na2MoO4 - pbMoO4

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 Publication date 2017
  fields Chemistry
and research's language is العربية
 Created by Shamra Editor




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Lead and sodium molybdates form one of the most promising chemical compounds because of their various and important properties when used in many different technological applications such ceramic preparation, melting resistance materials and used in solar energy applications. This research aims to study the equilibriums phases in the binary system of sodium molybdate with lead molybdate. We used there for tow techniques :The technique of X-ray diffraction, and technique of differential thermal analysis to study some physical properties. The result of this research was the obtaining of a solid solution based on a lead molybdates, where the sodium molybdate is dissolved in the lead molybdateup to 40 % molar percentage.


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Research summary
تتناول هذه الدراسة البحث في توازنات الأطوار في النظام الثنائي لموليبدات الصوديوم وموليبدات الرصاص. تهدف الدراسة إلى فهم كيفية تفاعل هذين المركبين الكيميائيين وتشكيلهما لمحلول صلب، وذلك باستخدام تقنيتين رئيسيتين: حيود الأشعة السينية والتحليل الحراري التفاضلي. أظهرت النتائج أن موليبدات الصوديوم يمكن أن تذوب في موليبدات الرصاص حتى نسبة 40% مولية، مما يؤدي إلى تشكيل محلول صلب. تمت دراسة العينات باستخدام جهاز انعراج الأشعة السينية على المساحيق، وأظهرت النتائج توافقًا مع طيف موليبدات الرصاص حتى نسبة 40% من موليبدات الصوديوم. بعد هذه النسبة، تظهر العينات طورين في حالة توازن. كما تم استخدام جهاز التحليل الحراري التفاضلي لتحديد التحولات الطورية للعينات المدروسة. بناءً على هذه النتائج، تم رسم مخطط توازنات الأطوار للنظام الثنائي المدروس. توصلت الدراسة إلى أن الاختلاف في البنى البلورية والتكافؤ النسبي بين المركبين هو السبب الرئيسي لتشكيل المحلول الصلب المحدود.
Critical review
دراسة نقدية: تعتبر هذه الدراسة مهمة لفهم توازنات الأطوار في النظام الثنائي لموليبدات الصوديوم وموليبدات الرصاص، ولكن يمكن توجيه بعض الملاحظات النقدية لتحسينها. أولاً، كان من الممكن توسيع نطاق الدراسة لتشمل نسب مولية أعلى من 40% لموليبدات الصوديوم لمعرفة ما إذا كانت هناك تحولات طورية أخرى تحدث. ثانياً، لم يتم التطرق بشكل كافٍ إلى التطبيقات العملية لهذه النتائج في الصناعات المختلفة، مما كان يمكن أن يضيف قيمة إضافية للدراسة. ثالثاً، كان من الممكن استخدام تقنيات تحليلية إضافية مثل التحليل الطيفي بالأشعة تحت الحمراء لتعزيز النتائج. على الرغم من هذه النقاط، فإن الدراسة تقدم مساهمة قيمة في مجال الكيمياء غير العضوية وتوازنات الأطوار.
Questions related to the research
  1. ما هي التقنية المستخدمة لدراسة توازنات الأطوار في هذه الدراسة؟

    استخدمت الدراسة تقنيتين رئيسيتين: حيود الأشعة السينية والتحليل الحراري التفاضلي لدراسة توازنات الأطوار في النظام الثنائي لموليبدات الصوديوم وموليبدات الرصاص.

  2. ما هي النسبة المولية القصوى لموليبدات الصوديوم التي يمكن أن تذوب في موليبدات الرصاص؟

    يمكن لموليبدات الصوديوم أن تذوب في موليبدات الرصاص حتى نسبة 40% مولية.

  3. ما هي البنى البلورية لموليبدات الصوديوم وموليبدات الرصاص؟

    البنية البلورية لموليبدات الصوديوم هي مكعبية (cubic)، بينما البنية البلورية لموليبدات الرصاص هي رباعية (tetragonal).

  4. ما هي الأسباب التي تؤدي إلى تشكيل محلول صلب محدود في النظام الثنائي المدروس؟

    الأسباب تشمل اختلاف البنى البلورية للمركبين واختلاف قيم التكافؤ النسبي بينهما، حيث أن تكافؤ الصوديوم هو (1+) وتكافؤ الرصاص هو (2+)، بالإضافة إلى الفرق بين أنصاف الأقطار للشاردتين.


References used
JOHN, B. WACHTMAN, Jr. Ceramic Innovationsin the 20th century, TheAmerican Ceramic Society, 1999
MORTIMER, C. E. Chemistry: A Conceptual Approa. 3rd ed,D. Van Nostrad Company, New York,1975
BRADSHAW,R.W. ;TYNER,C.E. Chemical and Engineering Factors AffectingSolar Central Receiver Applications of Ternary Molten Salts. AIChE Summer National Meeting, Denver, CO,Reprint 90b, August 1988
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