Heat capacity and thermodynamic functions of nanostructured manganese ferrites of composition NdMe1.5MnFeO6 (Me = Mg, Ca, Sr, and Ba) in the temperature range from 298.15 to 673 K
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- 作者：Sh. B. Kasenova ; Zh. I. Sagintaeva…
- 关键词：manganese ferrite ; heat capacity ; thermodynamic functions
- 刊名：Russian Journal of Physical Chemistry A, Focus on Chemistry
- 出版年：2015
- 出版时间：April 2015
- 年：2015
- 卷：89
- 期：4
- 页码：586-591
- 全文大小：161 KB
- 参考文献：1. Smirnov, I A (1991) Zh. Vses. Khim. Obshch. Mendeleeva 36: pp. 95 <br> 2. Gusev, A N (2007) Methods of Production of Nanosized Materials. Ural. Gos. Univ., Yekaterinburg <br> 3. Kasenov, B K, Davrenbekov, S Zh, Mustafin, E S (2013) Russ. J. Inorg. Chem. 58: pp. 570 blank" title="It opens in new window">CrossRef <br> 4. Platunov, E S, Buravoi, S E, Kurepin, V V, Petrov, G S (1986) Thermophysical Measurements and Devices. Mashinostroenie, Leningrad <br> 5. Technical Description and User Manual of IT-s-400 Heat Capacity Meter (1986). <br> 6. Kasenova, Sh B, Kasenov, B K, Sagintaeva, Zh I (2014) Zh. Fiz. Khim. 88: pp. 836 <br> 7. Spiridonov, V P, Lopatkin, A A (1970) Mathematical Processing of Physicochemical Data. Mosk. Gos. Univ., Moscow <br> 8. Robie, R A, Hewingway, B S, Fisher, J K (1978) Thermodynamic Properties of Minerals and Related Substances at 298.15 K and (105 Pa) Pressure and at Higher Temperatures. <br> 9. Kumok, V N (1987) Direct and Inverse Problems of Chemical Thermodynamics. <br>
- 刊物类别：Chemistry and Materials Science
- 刊物主题：Chemistry<br>Physical Chemistry<br>Russian Library of Science<br>
- 出版者：MAIK Nauka/Interperiodica distributed exclusively by Springer Science+Business Media LLC.
- ISSN：1531-863X
文摘
The isobaric heat capacities of nanostructured manganese ferrites NdMe1.5b>MnFeO6b>, where Me is Mg, Ca, Sr, and Ba, are investigated at ΔT ranging from 298.15 to 673 K by means of dynamic calorimetry. It is established that all of the investigated compounds exhibit λ-shape anomalies on dependence graphs C p b>° ?(T) that could be due to second-order phase transitions. Dependence equations C p b>° ?(T) are derived with allowance for the temperatures of phase transitions and the temperature dependences of their thermodynamic functions S°(T), H°(T) ?H°(298.15), and Φ xx (T) are calculated for the temperature range of 298.15 to 675 K.