C. Drasar

Functionally graded materials for sensor and energy applications

Principles, preparation, characterisation, and application of functional materials containing a gradient of their functional properties are surveyed, with main emphasis on thermoelectric (TE) materials for application in sensors and thermogenerators. Further examples of the implementation of functionally graded materials (FGM) presented are dielectric thin-film stacks for capacitors with low temperature coefficient, microwave-processed structural gradients in fuel cell electrodes, and zone-melted graded (Bi1 − xSbx)2Te3 materials for Peltier coolers. Preparation and properties of compositional gradients in TE solid solutions (FeSi2 doped by alloying, (Bi1 − xSbx)2Te3, Mg2(Si,Ge,Sn), PbTe) are analysed, as well as composites joining thermoelectrics of dissimilar chemistry and joints to metallic contacts and interlayers. Thermal spraying of doping-graded FeSi2 was developed as a preparation technique of TE silicide-based FGM. Design, preparation and test of a layered heat-flux sensor based on FeSi2 are described. A calibration test evidenced the feasibility of linearisation of thermal sensor characteristics. A theoretical design tool for functionally graded and segmented thermoelectric structures was based on a local selection criterion to identify the optimal spatial compositional distribution.

Low-temperature ferromagnetic properties of the diluted magnetic semiconductor Sb2-x Crx Te3 .

We report on magnetic and electrical transport properties of

Structural defects in Cu-doped Bi2Te3 single crystals

{\mathrm{Sb}}_{2\ensuremath{-}x}{\mathrm{Cr}}_{x}{\mathrm{Te}}_{3}

Figure of merit of quaternary (Sb0.75Bi0.25)2−xInxTe3 single crystals

single crystals with

Properties of Bi2Se3 Single Crystals Doped with Fe Atoms

0\ensuremath{\leqslant}x\ensuremath{\leqslant}0.095

Magneto-optics of massive dirac fermions in bulk Bi2Se3.

over temperatures from

Seebeck Scanning Microprobe for Thermoelectric FGM

2\phantom{\rule{0.3em}{0ex}}\mathrm{K}

Potential-Seebeck-microprobe (PSM): measuring the spatial resolution of the Seebeck coefficient and the electric potential

to

Optical properties of Bi2Se3-xAsx single crystals

300\phantom{\rule{0.3em}{0ex}}\mathrm{K}

n-type to p-type crossover in quaternary BixSbyPbzSe3 single crystals

. A ferromagnetic state develops in these crystals at low temperatures with Curie temperatures that are proportional to