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Title: Thermal conductivity of irradiated tetragonal lithium aluminate

Journal Article · · Journal of Nuclear Materials

The effect of 120 keV He++D+-ion irradiation on the thermal conductivity of ceramic tetragonal γ-LiAlO2 is studied with time-domain thermoreflectance (TDTR) at temperatures between 300 and 700 K. The thermal conductivity of single crystal γ-LiAlO2 is 13.5 W/(m·K) at 300 K, and scales with temperature like 1/T. The thermal conductivity of unirradiated polycrystalline γ-LiAlO2 is 7.4 W/(m·K). Irradiation at fluences of 1 ×, 5 ×, and 10 × 1016 ions/cm2 decreases the thermal conductivity by ≈ 30 %, 80 %, and 90 %. The effect of irradiation is saturated at ion fluences of 1017 ions/cm2. Irradiation decreases the temperature dependence of the thermal conductivity. For ion fluences larger than 1017 ions/cm2, the thermal conductivity reaches a minimum value of ≈ 1 W/(m·K) that is independent of temperature.

Research Organization:
Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA); USDOE National Nuclear Security Administration (NNSA), Office of Defense Nuclear Security
Grant/Contract Number:
AC05-76RL01830
OSTI ID:
2500983
Report Number(s):
PNNL-SA--195405
Journal Information:
Journal of Nuclear Materials, Journal Name: Journal of Nuclear Materials Vol. 606; ISSN 0022-3115
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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