Authors: Mohamed Hamid Elsheikh Mohd Faizul Mohd Sabri Suhana Mohd Said Yuzuru Miyazaki H H Masjuki Dhafer Abdul Ameer Shnawah Bui Duc Long Shuma Naito Mohamed Bashir Ali Bashir
Publish Date: 2016/02/08
Volume: 45, Issue: 6, Pages: 2886-2890
Abstract
A polycrystalline phase of Hffilled CoSb3 skutterudite was successfully prepared by the mechanical alloying technique followed by the spark plasma sintering process Xray diffraction and scanning electron microscopy linked with energydispersive xray spectroscopy were used to investigate the result filling the void spaces with Hf HfCo4Sb12 skutterudite possesses a very low thermal conductivity 18 W/m K lower than that of some lanthanidefilled skutterudites while exhibiting ptype conduction The anharmonicity of oscillation of the loosely bond Hf atoms the point defects on the lattice microstructure and the large area fraction of the grain boundaries were the reasons for the significant drop in the thermal conductivity of Hffilled CoSb3 Thus this work is useful in deriving a pathway for improvement in thermoelectrics through the introduction of smaller rattling cations with higher mass to increase the disorder of the lattice structure
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