A thermodynamic description of all stable phases of the Fe-Nd-B system is presented. This description was obtained by the optimization of experimental thermochemical and phase diagram data from literature using a least-square method. Previous assessments of the three limiting binary systems were incorporated. A reassessment of the Nd-B phase diagram is performed, taking into account the experimental information of the ternary system. The calculated results are in excellent agreement with the experimental data. A reaction scheme is presented, accounting for all invariant reactions in the system. This leads to some differences with earlier suggestions regarding the phase relations in composition regions where the amount of experimental data is limited. It is expected that the present description could therefore provide an answer to some of the remaining conflicts between phases one would expect from the previously suggested phase diagrams and what is actually observed.

Thermodynamic assessment of the Fe-Nd-B phase diagram

Critical evaluation and optimization of all available phase diagram and thermodynamic data for the Fe-RE (RE = La, Ce, Pr, Nd and Sm) systems have been conducted. The thermodynamic properties of the liquid phase and solutions were described using the modified quasichemical model and the compound energy Formalism, respectively. The magnetic properties of solid phases were also taken into account. In order to obtain more accurate thermodynamic description, the systematic changes in the phase diagrams and liquid enthalpy of mixing along the lanthanide series were considered in the evaluation of experimental data.

Critical Systematic Evaluation and Thermodynamic Optimization of the Fe-RE System: RE = La, Ce, Pr, Nd and Sm

Experimental investigation and thermodynamic description of the Fe−Nd−Pr system

The ${\mathrm{TlBaCa}}_{3}$${\mathrm{Cu}}_{3}$${\mathrm{O}}_{8.5}$ superconductor contains two main superconducting phases, 1:2:2:3 and 2:2:2:3, identified by powder x-ray analysis. Using $^{57}\mathrm{Fe}$ M\"ossbauer nuclei as the probe, it has been confirmed that the results are the same as those furnished by x-ray analysis. It has also been proved that iron atoms in the lattice substitute two inequivalent sites of copper atoms for each main phase. We have observed a temperature dependence of the M\"ossbauer parameters, i.e., quadrupole splitting, isomer shift, and relative resonance area. Here several problems are discussed related to the lattice dynamics and the electric charge transfer, which takes place in the transition from normal state to superconducting state.

Mössbauer observation near the superconducting transition temperature in the TlBaCa3Cu3O8.5 superconductor.

Pb-doped Tl-Ba-Ca-Cu-O compounds with nominal composition TlPb{sub {ital x}}BaCa{sub 3}Cu{sub 3}O{sub {ital y}} have been sintered, and their physical properties have been studied. It is found that the superconducting transition temperature of the samples drops with the increase of {ital x}. The crystal structure is tetragonal, and the lattice constants reduce with Pb content. Precipitated phases are also present in the Pb-doped samples. The pressure dependence of {ital T}{sub {ital c}} for the Pb-doped samples has also been studied. It is found that {ital T}{sub {ital c}} increases with pressure at a rate of {ital dT}{sub {ital c}}{sup {ital R}=0}/dP=0.22 K/kbar for {ital x}=0.5, a higher rate than the {ital dT}{sub {ital c}}{sup {ital R}=0}/dP=0.18 K/kbar for pure Tl-Ba-Ca-Cu-O.

Superconductivity and its pressure dependence in the Pb-doped Tl-Ba-Ca-Cu-O superconductors

We synthesized new superconducting phases in TlBa2Can-1CunO2n+2.5 by solid state reaction. The crystal structures of TlBa2CaCu2O6.5 and TlBa2Ca2Cu3O8.5 were determined by means of X-ray powder diffraction method. The two compounds belong to primary lattice with space group D4h1-P4/mmm. The lattice constants of TlBa2CaCu2O6.5 areα= 3.847 A, c = 12.73 A. The lattice constants of TlBa2Ca2Cu3O8.5 are a = 3.847A, c= 15.89A. Each cell contains one chemical formula unit. The cations are distributed alternately at positions of (0,0,z) and (1/2, 1/2, z) along Z axis.
TlBa2CaCu2O6.5 shows zero resistance at 101.4K. TlBa2Ca2Cu3O8.5 shows zero resistance at 112K. The oxygen deficient pseudo-perovskite unit Ba2Can-1CunO2n+1 is separated by single Tl-O layer in the crystal structure of TlBa2Can-1CunO2n+2.5, while the oxygen deficient pseudo-perovskite unit Ba2Can-1CunO2n is separated by bilayer of Tl-O in the crystal structure of Tl2Ba2Can-1CunO2n+2· At the same n value, Tc of Tl2Ba2Can-1CunO2n+4 is about 10K higher than Tc of TlBa2Can-1CunO2n+2.5· This indicates that Tc depends on the number of Tl-O layer as well as the number of [CuO5] and [CuO4] in oxygen deficient pseudo-perovskite unit Ba2Can-1Cun O2n.

The crystal-structures and superconductivity of a new series of superconducting phases

Phase-diagram of nd-fe-b ternary-system

Crystal-structure and superconductivity of labacu2o5+x

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The crystal-structures and superconductivity of a new series of superconducting phases

Phase-diagram of nd-fe-b ternary-system

Crystal-structure and superconductivity of labacu2o5+x