DEPTH-RESOLVED THERMAL CONDUCTIVITY AND DAMAGE IN SWIFT HEAVY ION IRRADIATED METAL OXIDES

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dc.contributor.authorAbdullaev, Azat
dc.contributor.authorKoshkinbayeva, Ainur
dc.contributor.authorChauhanb, Vinay
dc.contributor.authorNurekeyev, Zhangatay
dc.contributor.authorO’Connell, Jacques
dc.contributor.authorJanse van Vuuren, Arno
dc.contributor.authorSkuratov, Vladimir
dc.contributor.authorKhafizov, Marat
dc.contributor.authorUtegulov, Zhandos N.
dc.date.accessioned2022-05-18T05:40:08Z
dc.date.available2022-05-18T05:40:08Z
dc.date.issued2022
dc.description.abstractWe investigated thermal transport in swift heavy ion (SHI) irradiated insulating single crystalline oxide materials: yttrium aluminum garnet- Y3Al5O12 (YAG), sapphire (Al2O3), zinc oxide (ZnO) and magnesium oxide (MgO) irradiated by 167 MeV Xe ions at 1012 – 1014 ions/cm2 fluences. Depth profiling of the ther mal transport on nano- and micro- meter scales was assessed by time-domain thermoreflectance (TDTR) and modulated thermoreflectance (MTR) methods, respectively. This combination allowed us to isolate the conductivities of different sub-surface damage-regions characterized by their distinct microstructure evolution regimes. Thermal conductivity degradation in SHI irradiated YAG and Al2O3 is attributed to for mation of ion tracks and subsequent amorphization, while in ZnO and MgO it is mostly due to point defects. Additionally, notably lower conductivity when probed by very low penetrating thermal waves is consistent with surface hillock formation. An analytical model based on Klemens-Callaway method for thermal conductivity coupled with a simplified microstructure evolution capturing saturation in defect concentration was used to obtain depth dependent damage across the ion impacted region. The studies showed that YAG has the highest damage profile resulting in the less dependence of thermal conductivity with the depth, while MgO on the contrary has the strongest dependence. The presented work sheds new light on how SHI induced defects affect thermal transport degradation and recovery of oxide ceramics as promising candidates for next generation nuclear reactor applicationsen_US
dc.identifier.citationAbdullaev, A., Koshkinbayeva, A., Chauhan, V., Nurekeyev, Z., O’Connell, J., van Vuuren, A. J., Skuratov, V., Khafizov, M., & Utegulov, Z. N. (2022). Depth-resolved thermal conductivity and damage in swift heavy ion irradiated metal oxides. Journal of Nuclear Materials, 561, 153563. https://doi.org/10.1016/j.jnucmat.2022.153563en_US
dc.identifier.urihttp://nur.nu.edu.kz/handle/123456789/6158
dc.language.isoenen_US
dc.publisherJournal of Nuclear Materialsen_US
dc.rightsAttribution-NonCommercial-ShareAlike 3.0 United States*
dc.rights.urihttp://creativecommons.org/licenses/by-nc-sa/3.0/us/*
dc.subjectType of access: Open Accessen_US
dc.subjectThermal transporten_US
dc.subjectSwift heavy ionsen_US
dc.subjectAmorphizationen_US
dc.subjectIon tracksen_US
dc.subjectPhonon scatteringen_US
dc.subjectMetal oxidesen_US
dc.titleDEPTH-RESOLVED THERMAL CONDUCTIVITY AND DAMAGE IN SWIFT HEAVY ION IRRADIATED METAL OXIDESen_US
dc.typeArticleen_US
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