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Phonon-glass electron-crystal Behaviour by A site Disorder in n-Type Thermoelectric Oxides

DOI: 10.1039/C7EE01510K DOI Help

Authors: Luke M. Daniels (University of Liverpool) , Stanislav N. Savvin (University of Liverpool) , Michael J. Pitcher (University of Liverpool) , Matthew S. Dyer (University of Liverpool) , John B. Claridge (University of Liverpool) , Sanliang Ling (University College London) , Furio Cora (University College London) , Ben Slater (University College London) , Jonathan Alaria (University of Liverpool) , Matthew J. Rosseinsky (University of Liverpool)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Energy Environ. Sci.

State: Published (Approved)
Published: August 2017
Diamond Proposal Number(s): 12336 , 17193

Abstract: Phonon-glass electron-crystal (PGEC) behaviour is realised in La0.5Na0.5Ti1–xNbxO3 thermoelectric oxides. The vibrational disorder imposed by the presence of both La3+ and Na+ cations on the A site of the ABO3 perovskite oxide La0.5Na0.5TiO3 produces a phonon-glass with a thermal conductivity, κ, 80% lower than that of SrTiO3 at room temperature. Unlike other state-of-the-art thermoelectric oxides, where there is strong coupling of κ to the electronic power factor, the electronic transport of these materials can be optimised independently of the thermal transport through cation substitution at the octahedral B site. The low κ of the phonon-glass parent is retained across the La0.5Na0.5Ti1–xNbxO3 series without disrupting the electronic conductivity, affording PGEC behaviour in oxides.

Subject Areas: Chemistry, Materials, Physics


Instruments: I11-High Resolution Powder Diffraction