Thermodynamics of Fe3O4–Co3O4 and Fe3O4–Mn3O4 spinel solid solutions at the bulk and nanoscale

2015 ◽  
Vol 17 (34) ◽  
pp. 22286-22295 ◽  
Author(s):  
Sulata K. Sahu ◽  
Baiyu Huang ◽  
Kristina Lilova ◽  
Brian F. Woodfield ◽  
Alexandra Navrotsky
Keyword(s):  
Solid Solutions ◽  
Enthalpy Of Mixing ◽  
End Members ◽  
Spinel Solid Solutions

Enthalpy of mixing (ΔmixH) of (1 − x)Fe3O4–xMn3O4 spinel solid solutions with cubic Fe3O4 and tetragonal Mn3O4 end members.

Preliminary Evaluation of Thermodynamic Mixing Properties and Miscibility Limits for Cubic Dioxide (Zr, M)O2 and Zircon (Zr, M)SiO4 Solid Solutions (M = An4+, Ln4+)

1997 ◽  
Vol 506 ◽  
Author(s):  
V.A. Kurepin
Keyword(s):  
Solid Solution ◽  
Solid Solutions ◽  
Enthalpy Of Mixing ◽  
Thermodynamic Theory ◽  
Preliminary Evaluation ◽  
Interatomic Distances ◽  
Mixing Properties ◽  
Equilibrium Data ◽  
End Members ◽  
The Relationship

Cubic zirconia ZrO2 and zircon ZrSiO4 are considered as perspective crystalline form for immobilization of U, Pu and other radionuclides [1, 2]. The present study was undertaken to determine temperature dependence of solid solution limits in these compounds using thermodynamic theory of solid solutions and available equilibrium data. Thermodynamic mixing properties has been evaluated by means of the relationship between Margules parameter W and interatomic distances R in end-members AX and BX of a solid solution (A1−xBx)XW = α(ΔR/R)2where ΔR = R(BX) - R(AX), R = (1−x) R(AX) + x R(BX), α is a constant for isotypic isostructural compounds. According to the Urusov's energetic theory of enthalpy of mixing [3] such relationships exist between parameters W, AR and R of solid solutions with similar bonds between isomorphous atoms and their neighbors

scholarly journals Some Aspects of Spinodal Decomposition in Spinel Solid Solutions

1995 ◽  
Vol 50 (6) ◽  
pp. 525-532
Author(s):  
N. Burkert ◽  
R. Grüne ◽  
H. Schmalzried ◽  
S. Rahman
Keyword(s):  
Spinodal Decomposition ◽  
Solid Solutions ◽  
Common Property ◽  
Transport Theory ◽  
Decomposition Reaction ◽  
Sufficient Evidence ◽  
Spinel Crystal ◽  
Linear Transport Theory ◽  
Spinel Solid Solutions ◽  
Quasi Binary System

Abstract Decomposition morphologies of supersaturated spinel solid solutions in the quasi-binary system Co2TiO4-CoAl2O4 at 973 K show all pertinent features of spinodal decomposition. Since the decomposition morphology may not be considered as sufficient evidence for a spinodal process, the thermodynamics of the spinel solid solutions and the linear transport theory of spinodal decomposition were combined to corroborate the experimental results of the early decomposition reaction.Simultaneous ordering, a common property of ternary and higher nonequilibrium solid solutions, was also observed. These ordering processes occur locally in distinct regions of the spinel crystal. Moreover, the spinodal wavelength λ increases in time according to λ ∞ t, which is unusual and will be discussed in the light of cation diffusion in semiconducting oxides with two cation sublattices.

Crystal chemistry study of the solid solutions in the system La2BaZnO5—Eu2BaZnO5

2006 ◽  
Vol 221 (4) ◽  
Author(s):  
Apuleyo Hernández-Pérez ◽  
Lauro Bucio ◽  
Alejandro Ibarra-Palos ◽  
María Elena Villafuerte-Castrejón
Keyword(s):  
Crystal Chemistry ◽  
Solid Solutions ◽  
End Members

AbstractIn this work, a complete crystallochemical characterization of two solid solutions, which were founded in the binary end members system LaStructure refinements of Eu

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