Estimating the standard thermodynamic functions of rare-earth and alkali-earth manganitoferrites LnMIIMnFeO5.5 (Ln = La, Nd, Gd, Dy, Er; MII = Mg, Ca, Sr, Ba)

Kasenov, B. K.; Sagintaeva, Zh. I.; Abil’daeva, A. Zh.; Davrenbekov, S. Zh.; Bekturganov, Zh. S.

doi:10.1134/s0036024413060113

Cited by 1 publication

(5 citation statements)

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“…Table 5 below shows the initial data for calculating the standard enthalpies of titanium-manganites formation, which are borrowed from [ 17 , 29 , 30 , 31 ].…”

Section: Resultsmentioning

confidence: 99%

“…As a result of the above, the purpose of this study is a calorimetric investigation of heat capacity; calculations of the thermodynamic functions of the new titanium-manganites of LaLi 2 TiMnO 6 and LaNa 2 TiMnO 6 ; calculation of the fundamental thermodynamic constants of the studied compounds; the standard heat capacity, standard entropy, standard enthalpy of formation by the independent methods; and also the study of the temperature dependence of their electrophysical characteristics. This study is a continuation of our investigations; our results were summarized in [17]. The results obtained are of importance to predict the directed synthesis of the studied and analogous compounds, to analyze the heterogeneous equilibria according to II and III laws of thermodynamics involving titanium-manganites, and to discover their valuable physical and chemical properties.…”

Section: Introductionmentioning

confidence: 83%

“…In order to calculate the values of the standard enthalpies of formation of the test titanium-manganites, our developed method was used to calculate the standard enthalpy of formation of the double and triple manganites of the rare earth, alkali, and alkaline earth metals of the composition of LnMeI 3 MeII 3 Mn 4 O 12 (MeI-alkali, MeII-alkaline earth, Ln-rare earth metals) [33,34].…”

Section: T K Cmentioning

confidence: 99%

“…Table 5 below shows the initial data for calculating the standard enthalpies of titaniummanganites formation, which are borrowed from [17,[29][30][31]. It should be noted that the K coefficient for calculating ∆ ƒ H • (298.15) LaLi 2 TiMnO 6 will be equal to 1.2375, and for LaNa 2 TiMnO 6 − 1.3084.…”

Section: T K Cmentioning

confidence: 99%

“…The heat capacities and thermodynamic characteristics of K 2 La 2 Ti 3 O 10 , K 2 Nd 2 Ti 3 O 10 , ErGaTi 2 O 7, DyGaTi 2 O 7 , and EuGaTi 2 O 7 were studied by the experimental and calculated methods described in [ 14 , 15 , 16 ]. The research of the thermodynamic properties of double and ternary substituted manganites of the compositions of LaMe I Mn 2 O 5 , LnMe II Mn 2 O 5.5 , LnMe I 3 Mn 2 O 6 , and LnMe II 3 Mn 4 O 12 (Me I -alkali, Me II -alkaline earth, Ln-rare-earth metals), was generalized in [ 17 ]. The above results demonstrate that the data available in the literature describe the thermodynamic properties of the individually substituted titanates and the individual manganites of the rare earth, alkali, and alkaline earth metals.…”

Section: Introductionmentioning

confidence: 99%

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Heat Capacity and Thermodynamic Functions of Titanium-Manganites of Lanthanum, Lithium and Sodium of LaLi2TiMnO6 and LaNa2TiMnO6

Kasenov

Sagintaeva

Baisanov³

et al. 2023

Molecules

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Titanium-manganites of LaLi2TiMnO6 and LaNa2TiMnO6 were synthesized by the methods of ceramic technology from the oxides of lanthanum, titanium (IV), manganese (III), and the carbonates of lithium and sodium. The types of their syngony and the parameters of their gratings were determined radiographically. The isobaric heat capacities of titanium-manganites were measured with experimental calorimetry in the range of 298.15–673 K. It was found that on the dependence curve of heat capacity versus temperature of C°p~f(T), for LaLi2TiMnO6 at 348 K and 598 K, and LaNa2TiMnO6 at 348 K, there are abnormal jumps in heat capacity, probably related to phase transitions of the second kind. Taking into account the temperatures of the phase transitions, the equations of the temperature dependence of the heat capacity of titanium-manganites were derived. Their standard entropies were calculated by the ion increments method. Temperature dependences of the thermodynamic functions of S°(T), H°(T)-H°(298.15), and Φxx(T) were calculated using the experimental data on heat capacities and the calculated values of the standard entropies. The standard heat capacities of the studied compounds were calculated by the independent methods of ion increments and Debye, the values of which were in satisfactory agreement with the experimental data. The standard enthalpy of the formation of LaLi2TiMnO6 and LaNa2TiMnO6 was calculated according to the methodology developed by the authors. The conducted electrophysical studies determined the nature of the second-order phase transition and the semiconductor features of their conductivity. Thus, all the above-mentioned data on the experimental and calculated studies of the temperature dependence of heat capacity, the thermodynamic functions to determine a standard enthalpy of formation of LaLi2TiMnO6 and LaNa2TiMnO6, and the investigation of their electrical properties are absolutely new, and they have no analogues.

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“…Table 5 below shows the initial data for calculating the standard enthalpies of titanium-manganites formation, which are borrowed from [ 17 , 29 , 30 , 31 ].…”

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 83%

Section: T K Cmentioning

confidence: 99%

Section: T K Cmentioning

confidence: 99%