Enthalpies of mixing in the liquid mixtures of the alkali chlorides with MnCl2, FeCl2 and CoCl2

1971 ◽  
Vol 33 (5) ◽  
pp. 1249-1278 ◽  
Author(s):  
G.N. Papatheodorou ◽  
O.J. Kleppa
Keyword(s):  
Liquid Mixtures ◽  
Enthalpies Of Mixing ◽  
Alkali Chlorides

Structure and Energetics of Clusters Relevant to Thorium Tetrachloride Melts

2000 ◽  
Vol 55 (9-10) ◽  
pp. 772-778
Author(s):  
Z. Akdeniz ◽  
M. P. Tosi
Keyword(s):  
Structural Changes ◽  
Liquid Mixtures ◽  
Ionic Character ◽  
Ion Transfer ◽  
Ionic Model ◽  
Charged Species ◽  
Tetrahedral Molecule ◽  
Singly Charged ◽  
Chlorine Ion ◽  
Alkali Chlorides

Abstract We study within an ionic model the structure and energetics of neutral and charged molecular clusters which may be relevant to molten ThCl4 and to its liquid mixtures with alkali chlorides, with reference to Raman scattering experiments by Photiadis and Papatheodorou. As stressed by these authors, the most striking facts for ThCl4 in comparison to other tetrachloride compounds (and in particular to ZrCl4) are the appreciable ionic conductivity of the pure melt and the continuous structural changes which occur in the melt mixtures with varying composition. After adjusting our model to data on the isolated ThCl4 tetrahedral molecule, we evaluate (i) the Th2Cl8 dimer and the singly charged species obtained from it by chlorine-ion transfer between two such neutral dimers; (ii) the ThCl6 and ThCl7 clusters both as charged anions and as alkali-compensated species; and (iii) various oligomers carrying positive or negative double charges. Our study shows that the characteristic structural properties of the ThCl4 compound and of the alkali-Th chloride systems are the consequence of the relatively high ionic character of the binding, which is already evident in the isolated ThCl4 monomer.

scholarly journals Calorimetric Investigation of NdI3-MI Liquid Systems (M = Li, Na, K, Rb, Cs)

2002 ◽  
Vol 57 (3-4) ◽  
pp. 136-142 ◽  
Author(s):  
L. Rycerz ◽  
M. Gaune-Escarda
Keyword(s):  
Binary Systems ◽  
Composition Range ◽  
Liquid Mixtures ◽  
Enthalpies Of Formation ◽  
Calorimetric Investigation ◽  
Liquid Alkali Metal ◽  
Enthalpies Of Mixing ◽  
Formation Enthalpies ◽  
Liquid Systems ◽  
Metal Iodide

The molar enthalpies of mixing, Δmix Hm, of the liquid alkali metal iodide - neodymium iodide binary systems have been measured over the whole composition range at 1068 K with an accuracy of about 6%. The apparatus used was a Calvet - type high - temperature microcalorimeter. In all the systems under investigation the enthalpies of mixing are negative, with minimum values close to −1.1, −4.8, −10.3, −16.2, and −20.0 kJ mol−1 for LiI-NdI3, NaI-NdI3, KI-NdI3, RbI-NdI3, and CsI-NdI3, respectively, at the mole fractions xNdI3 ⋍ 0.30 - 0.40 except the LiI-NdI3 system, where it is at the NdI3-rich compositions. The molar enthalpies of formation ΔformHm at 1068 K for M = Li, Na, K, Rb, and Cs, arising from the reaction 3 MI(l) + NdI3(l), are found to be −4.5, −17.5, −39.1, −59.9, and −73.3 kJmol−1, respectively They are compared with the formation enthalpies determined previously for the (3MCl, NdCl3) and (3MBr,NdBr3) liquid mixtures. These enthalpies become less negative with increase of the radius of the halide ion.

scholarly journals Enthalpies of Mixing in Liquid Mixtures of Lithium Sulphate and Sodium Sulphate.

1970 ◽  
Vol 24 ◽  
pp. 709-710 ◽  
Author(s):  
Jan Lützow Holm ◽  
Ulf Aava ◽  
A. Haaland ◽  
Dag Resser ◽  
S. E. Rasmussen ◽  
...  
Keyword(s):  
Liquid Mixtures ◽  
Sodium Sulphate ◽  
Enthalpies Of Mixing ◽  
Lithium Sulphate

Thermodynamics of the Ternary System Na2O—P2O5 —B2O3

1987 ◽  
Vol 42 (5) ◽  
pp. 463-470 ◽  
Author(s):  
S. Julsrud ◽  
O. J. Kleppa
Keyword(s):  
Ternary System ◽  
Structural Models ◽  
Liquid Mixtures ◽  
Enthalpies Of Mixing

The enthalpies of mixing of the liquid mixtures of (NaBO2)2 + B2O3 , Na4P2O7 + (NaPO3)2 , (NaPO3)2 + B2O3 and Na4P2O7 + (NaBO2)2 have been measured by liquid + liquid calorimetry. The results are discussed in terms of tentative structural models of the melts, and in terms of O2- ion transfers from phosphorus groups to boron groups in (NaPO3)2 + B2O3 and from boron groups to phosphorus groups in Na4P2O7 + (NaBO2)2 .

Mixing Enthalpies of TbBr3-MBr Liquid Mixtures

2001 ◽  
Vol 56 (12) ◽  
pp. 859-864 ◽  
Author(s):  
L. Rycerz ◽  
M. Gaune-Escard
Keyword(s):  
Mole Fraction ◽  
Composition Range ◽  
Liquid Mixtures ◽  
Entire Composition Range ◽  
Mixing Enthalpy ◽  
Rich Region ◽  
Enthalpies Of Mixing ◽  
Binary Liquid ◽  
Liquid Systems ◽  
Mixing Enthalpies

AbstractThe molar enthalpies of mixing, Δmix Hm in the binary liquid systems TbBr3-MBr (M = Li, Na, K, Rb, Cs) have been m easured with a Calvet-type high-tem perature microcalorimeter over the entire composition range with an accuracy of about 6 %. Mixing of the two liquid components was achieved by using the “break-off am poule” technique. All the investigated systems show negative enthalpies of mixing with a minim um value of approxim ately -1.25, - 8 .3 , -17.0, - 2 0 . 0 and -22.5 kJ mol -1, for M = Li, Na, K, Rb and Cs, respectively. The mixing enthalpy in the TbBr3- LiBr system is positive in the TbBr3-rich region. For all the systems, the enthalpy minimum occurs at mole fraction xTbBr3 ≈ 0.3 - 0.4. The molar enthalpies of form ation Δ formHm (3MBr, TbBr3, 1) for M = Li, Na, K, Rb and Cs at 1113 K (arising from the reaction 3M Br(1) +TbBr3(1) = (3MBr, TbBr3) (1)) are found to be -4 .8 , -31.3, -63.3, -70.3 and -8 1 .2 kJ mol-1 , respectively. The leastsquares coefficients A, B, C, D and E in the equation λ (kJ mol-1) = A + B x + C x2 + Dx3 + Ex4, where A is an interaction param eter and x = xTbBr , are also reported.

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