Vivian Nassif

Structural analysis and thermoelectric properties of mechanically alloyed colusites

We describe here a new, easy and scalable route for synthesising colusites by using mechanical-alloying and reactive spark plasma sintering, together with the thermoelectric behaviour of zinc-substituted derivatives, Cu26−xZnxV2Sn6S32 (0 ≤ x ≤ 2). X-ray diffraction analysis coupled with transmission electron microscopy evidences the high crystallinity of the as-synthesized samples. In the pristine compound, an intrinsic exsolution phenomenon leads to the formation of two distinguishable colusite phases. Additional neutron powder diffraction results support the substitution of Zn in the tetrahedral Cu sites and 119Sn Mossbauer spectroscopy analyses prove the presence of only Sn4+ in colusite irrespective of the Zn content (x ≤ 2). The mechanical properties denote a wide homogeneity of the samples despite a significant impact of the exsolution on the microstructure. The Zn for Cu substitution provides electron doping, decreasing the holes concentration. High temperature thermoelectric properties in the p-type series Cu26−xZnxV2Sn6S32 are reported. The highest power factor of 0.92 mW m−1 K−2 at 700 K is found for x = 1, with a corresponding ZT value of 0.4.

Effect of the isoelectronic substitution of Sb for As on the magnetic and structural properties of LaFe(As1−xSbx)O

The antiferromagnetic (AFM) order and structural distortion in the LaFe(As

Spin reorientation in NdFe0.5Mn0.5O3 : Neutron scattering and ab initio study

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High-Performance Thermoelectric Bulk Colusite by Process Controlled Structural Disordering

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Magnetic Structure of SmCo5 from 5 K to the Curie Temperature

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Singlet Orbital Ordering in Bilayer Sr3Cr2O7

)O system have been investigated by neutron powder diffraction and physical properties measurements. Polycrystalline samples of LaFe(As

Polymorphism in Thermoelectric As2Te3.

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The crucial role of selenium for sulphur substitution in the structural transitions and thermoelectric properties of Cu5FeS4 bornite

Sb

Synthesis and characterization of the new two-dimensional Heisenberg antiferromagnet double perovskite BaLaCuSbO6

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High temperature neutron powder diffraction study of the Cu12Sb4S13 and Cu4Sn7S16 phases

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