دراسة تحول الطور البنيوي للمركب(CH2)6 (NH3)2 Fe (II) Cl4 باستخدام مفعول مسباور وأيضا بإجراء قياسات على ثابتة العزل الكهربائية
Abstract
Mossbauer effect measurements of hexane- diammonium- ferro- tetra- chloride which will be designated as HDFC over the temperature range 311-360 K for single crystal absorbers have been carried out. The behavior of Mossbauer parameters as a function of temperature shows a strong anomaly at 348 K which indicates structural phase transformation.
Dielectric constant measurements of the above compound from 80-380 K at different selected frequencies 60-20000 Hz also have been carried out. The curves obtained by drawing of dielectric loss tand as a function of temperature show a peak at the same temperature of that of the Mossbauer effect where Mossbauer parameters indicated anomalous behavior.
Finally the values obtained for logarithmic real part of dielectric constant Ln e¢ are ranging from 3.7 to 5.4 which are typical values for existence of rotational motion. So, the curves of Ln e¢ as a function of temperature show a peak. It can be noticed that with increasing frequency the peak is still clear and there is no shift in its position by increasing temperature.
These results confirm without any doubt that there is sructural phase transformation of the mentioned compound happened at 348
أجريت قياسات على مركب هكسان- ثنائي أمونيوم- رباعي كلور الحديد الذي نرمز له اختصارا HDFC باستخدام مفعول مسباور ضمن مجال درجة حرارة يتراوح بين 311 و 360K من أجل عينات ماصة أحادية- البلورة. أظهرت وسطاء مسباور بتابعية درجة الحرارة شذوذا قويا عند درجة الحرارة 348 K مما يعني تحولا في الطور البنيوي.
كما أجريت قياسات على ثابتة العزل الكهربائي لمركب السابق في درجات الحرارة نفسها وعند تواترات (ترددات) مختلفة تتراوح من 60 إلى 20000 Hz.
تعطي قيم فقد العزل الكهربائي tan d التي حصلنا عليها بتابعية درجة الحرارة منحنيات كل منها ذروة عند درجة الحرارة نفسها التي أبدت فيها وسطاء مسباور شذوذا في سلوكها.
أخيرا، فإن القيم التي حصلنا عليها من أجل لوغاريتم الجزء الحقيقي لثابتة العزل الكهربائي Ln e¢ تتراوح بين 3.7 و 5.4 هي قيم نموذجية تدل على وجود حركة دورانية. يتضح من هذه المنحنيات أنه مع ازدياد التواتر تبقى الذرى واضحة كما لا يحصل انزياح في مواضعها مع ازدياد درجة الحرارة.
هذه النتائج تؤكد بما لا يقبل مجالا للشك وجود تحول في الطور التركيبي للمركب المذكور عند الدرجة 348 K.
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