NDLI: Heat capacity and electrophysical properties of GdMeFe2O5(Me

Content Provider	Springer Nature Link
Author	Kaseva, Sh. B. Sagintaeva, Zh. I. Kasev, B. K. Davrenbekov, S. Zh. Sergazina, S. M. Zhumadilov, E. Zh.
Copyright Year	2013
Abstract	The heat capacity of GdMeFe2O5(Me — Li, Na, K, Cs) is investigated within the temperature range of 298.15–673 K by a calorimetric method. λ-points are revealed in the C p ○ (T) curves at 448 K and 598 K in GdLiFe2O5, at 473 K and 573 K in GdNaFe2O5, at 448 K and 598 K in GdKFe2O5, and at 448 in GdCsFe2O5 related to a phase transition of the second kind. The temperature dependencies are calculated for the thermodynamic functions C p ○ (T), H ○(T)-H ○(298.15), S ○(T), and Φ**(T). The electrophysical characteristics of the synthesized ferrites are studied within the temperature range of 303–493 K: Effects similar to those found in the C p ○ (T) curves are also revealed in the logɛ(T) and logR (T) curves. The compositions are shown to exhibit a semiconductor-type electrical conductivity. At the T cond points of the ferrites, the semiconductor-type conductivity changes the metal type one and both the capacities and permittivities vary sharply, and that may be related to a ferroelectric phase transition (the Curie and the Neel points). These effects provide a certain possibility to clarify the nature of the λ-points in the C p ○ (T) curves.
Starting Page	54
Ending Page	59
Page Count	6
File Format	PDF
ISSN	0018151X
Journal	High Temperature
Volume Number	51
Issue Number	1
e-ISSN	16083156
Language	English
Publisher	SP MAIK Nauka/Interperiodica
Publisher Date	2013-02-16
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Atoms and Molecules in Strong Fields, Laser Matter Interaction Materials Science Classical Continuum Physics Physical Chemistry Industrial Chemistry/Chemical Engineering
Content Type	Text
Resource Type	Article
Subject	Engineering Condensed Matter Physics

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