Optimization of the composition Eu5+xAl3+ySb6 and thermoelectric figure of merit

Eu5.08Al3Sb6 can be described as a pseudo rock salt-like “(Eu/Al4)Sb” structure. The polycrystalline synthesis of Eu5+xAl3+ySb6 was optimized. The compositions exhibit n-type transport behavior, ultra-low thermal conductivity, and a high Seebeck coefficient. The Eu5.08Al4Sb6 shows a promising zT of 0.8 at a temperature of 873 K., , , # Optimization of the composition Eu5+xAl3+ySb6 and thermoelectric figure of merit

[https://doi.org/10.5061/dryad.1zcrjdg3q](https://doi.org/10.5061/dryad.1zcrjdg3q)

## Description of the data and file structure

The data sets are: (1) powder x-ray diffraction (PXRD), thermal gravimetric (TG)- Differential scanning calorimetry (DSC)

**Powder X-ray Diffraction (PXRD)**

PXRD data were collected with a Bruker D8 Advance Eco Diffractometer using Cu Kα radiation from 2θ = 20° —80°  with a step size of 0.02 ˚ and scan rate of 1 s/step at room temperature in air. The polycrystalline samples were ground inside an Ar-filled glove box and plated on a zero-background holder with isopropanol.

**Thermogravimetric (TG)/Differential Scanning Calorimetry (DSC)**

Melting point studies of aluminum excess were done on polished pellet pieces of Eu5+*x*Al3+*y*Sb6 using TG/DSC (STA 449 F3 Jupiter, Netzsch) from room temperature up to 800°C with a heating rate of 10K/min under a 50 mL/min flow of Ar.  A...,