Annealing Time Dependence on the Phase Equilibria and Thermoelectric Property of Type-I Ba&lt;sub&gt;8&lt;/sub&gt;Cu&lt;sub&gt;6&lt;/sub&gt;Ag&lt;sub&gt;2&lt;/sub&gt;Si&lt;sub&gt;38&lt;/sub&gt; Clathrate

The intermetallic phase [LixBa8-x][LiySi46-y] is the first example of a clathrate-I silicide containing lithium with the peculiarity that the Li atoms occupy both cage and framework positions. The phase was obtained by ambient-pressure solid-state reactions at 400 degrees C between Ba4Li2Si6 and the binary clathrate phase Ba8-xSi46 applying different experimental approaches. In this reaction, Li atoms substitute Si atoms of the framework at site 6c (space group Pm (3) over barn) and fill up the Ba-deficient dodecahedral Si-20 cages at site 2a. The presence of Li atoms in the clathrate phase was proven by combined X-ray powder diffraction, Li-7 and Si-29 solid-state NMR analyses. Incorporation of lithium markedly increased the lattice parameter of the clathrate phase, e. g. from a = 10.3200(2)

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Type-I silicon clathrates containing lithium

Böhme

Bobnar

Ormeci

et al. 2016

Zeitschrift Für Kristallographie - Crystalline Materials

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The Evolution of Heat-electric Power Generator

Munetoh

2017

Materia Japan

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A Novel Electric Power Generation under Uniform Temperature Environment using Poly-crystalline Ba8AuxSi46−x Clathrate

Munetoh¹,

Osakabe

Yamasoto

et al. 2017

J. Jpn. Soc. Powder Powder Metallurgy

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Poly-crystalline Ba 8 Au x Si 46−x clathrate with p-n junction was synthesized for electric power generation from heat under no temperature difference. The n-type Ba 8 Au 4.5 Si 41.5 and the p-type Ba 8 Au 5.5 Si 40.5 powder were stacked in the graphite die and sintered by a Spark Plasma Sintering (SPS) method at 1073 K for 5 min with pressure of 50 MPa. The Au composition of Ba 8 Au 4.5 Si 41.5 and Ba 8 Au 5.5 Si 40.5 side in the sintered sample were Ba 7.8 Au 4.2 Si 41.8 and Ba 7.8 Au 5.2 Si 40.8 , respectively. It was found that the Au composition was gradually changed near the interface with thickness of around 500 micrometers. Electric power generation test under no temperature difference was performed by using the sample cut to contain the interface of two layers. The electric power increased by only heating and the maximum voltage can be observed around 2 mV at 773 K. These results suggested that electron excitation occurred near the n/p interface and generated electrons and holes diffuse to n-type and p-type semiconductor side, respectively.

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Annealing Time Dependence on the Phase Equilibria and Thermoelectric Property of Type-I Ba<sub>8</sub>Cu<sub>6</sub>Ag<sub>2</sub>Si<sub>38</sub> Clathrate

Cited by 3 publications

References 15 publications

Type-I silicon clathrates containing lithium

Type-I silicon clathrates containing lithium

The Evolution of Heat-electric Power Generator

A Novel Electric Power Generation under Uniform Temperature Environment using Poly-crystalline Ba<sub>8</sub>Au<sub>x</sub>Si<sub>46−x</sub> Clathrate

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