Fabrication of glass-ceramics containing spin-chain compound SrCuO{sub 2} and its high thermal conductivity
- Department of Applied Physics, Tohoku University, 6-6-05 Aoba, Aoba-ku, Sendai 980-8579 (Japan)
High thermal conductivity materials are in great demand for heat-flow control and heat dissipation in electronic devices. In this study, we have produced a glass-ceramics that contains spin-chain compound SrCuO{sub 2} and have found that the glass-ceramics yields high thermal conductivity of ∼5 W K{sup −1} m{sup −1} even at room temperature. The glass-ceramics is fabricated through crystallization of inhomogeneous melt-quenched oxides made from SrCO{sub 3}, CuO, Li{sub 2}CO{sub 3}, Ga{sub 2}O{sub 3}, and Al{sub 2}O{sub 3}. Transmission electron microscopy and X-ray and electron diffraction reveal that SrCuO{sub 2} crystallites with a size of 100–200 nm are precipitated in the glass-ceramics. The highness of the thermal conductivity is attributable to two sources: one is elongation of phonon mean free path due to the crystallization of the inhomogeneous structure or structural ordering. The other is emergence of the heat carriers, spinons, in the SrCuO{sub 2}. This highly thermal conductive glass-ceramics is expected to be utilized as base materials for heat-flow control devices.
- OSTI ID:
- 22398841
- Journal Information:
- Applied Physics Letters, Vol. 106, Issue 14; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
- Country of Publication:
- United States
- Language:
- English
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SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALUMINIUM OXIDES
CERAMICS
COPPER OXIDES
CRYSTALLIZATION
ELECTRON DIFFRACTION
ENERGY LOSSES
GALLIUM OXIDES
GLASS
HEAT FLUX
HEAT TRANSFER
LITHIUM CARBONATES
MEAN FREE PATH
PHONONS
SPIN
STRONTIUM CARBONATES
THERMAL CONDUCTIVITY
THERMAL DIFFUSIVITY
TRANSMISSION ELECTRON MICROSCOPY
X-RAY DIFFRACTION