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            <title xml:lang="en">Magnetic and thermoelectric properties of the ternary pseudo-hollandite BaXCr5Se8 (0.5 andlt; x andlt; 0.55) solid solution</title>
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                <term xml:lang="en">Thermoelectric properties</term>
                <term xml:lang="en">Antiferromagnetism</term>
                <term xml:lang="en">Magnetic properties</term>
                <term xml:lang="en">Magnetism</term>
                <term xml:lang="en">Seebeck coefficient</term>
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                <term xml:lang="en">Thermoelectric performance</term>
                <term xml:lang="en">Temperature dependence</term>
                <term xml:lang="en">Low thermal conductivity</term>
                <term xml:lang="en">Hall measurements</term>
                <term xml:lang="en">Cell parameter</term>
                <term xml:lang="en">Antiferromagnetics</term>
                <term xml:lang="en">Antiferromagnetic transition</term>
                <term xml:lang="en">Thermoelectricity</term>
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                <term xml:lang="en">Thermal conductivity</term>
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              <p>The structure of Ba0.5Cr5Se8 has been recently resolved, and its thermoelectric and magnetic properties have been studied. A ZT of 0.12 was found at around 800 K. Here, we report a study on the pseudo-hollandite BaxCr5Se8 solid-solution with 0.5 ≤ x ≤ 0.55 and its thermoelectric and magnetic properties. There is no significant impact either on the cell parameters depending on the cation content or on the magnetic properties. However, thermoelectric properties are radically changed depending on x content. While the low thermal conductivity, around 0.8 W m-1 K-1, remains similar for all samples, a respective increase and decrease of the resistivity and the Seebeck coefficient are observed with increasing Ba content. The maximum Seebeck coefficient is found with Ba0.5Cr5Se8 at around 635 K with 315 μV K-1, and the Seebeck coefficient then decreases and is correlated with an activation of minority charge carriers confirmed by Hall measurements. A similar but steeper behavior is observed for the Ba0.55Cr5Se8 temperature dependence plot at around 573 K. Finally, the best thermoelectric performances are found using the lowest content of Ba, unlike when x tends to 0.55, ZT approaches a tenth of the initial best value. BaxCr5Se8 compounds are antiferromagnetic with TN = 58 K. A large peak in thermal conductivity is observed around the antiferromagnetic transition for all stoichiometry. © The Royal Society of Chemistry 2016.</p>
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