研究目的
To analyze the effect of swift heavy ion irradiation on yttrium aluminium perovskite (YAP) and yttrium aluminium garnet (YAG) single crystals, focusing on the influence of stopping power and temperature on latent track formation.
研究成果
It is clear from the results of this investigation that amorphous latent ion tracks form both YAP and YAG at stopping powers in the range from 11 to 41 keV/nm. Track diameters also increase with increasing stopping power and fit well with results from literature where available. YAP also consistently presents ion tracks smaller in size than those in YAG at similar stopping powers. The results from the samples irradiated at different temperatures suggest that approximately 10 keV/nm more energy is required to produce tracks, in YAP, that are similar in size to those in YAG.
研究不足
The thermal conductivities of YAP and YAG at temperatures below 100 K are largely unknown and even the values depicted are an estimate and often based on doped compounds used for laser applications. The value of thermal conductivity for YAP is also an average of the thermal conductivities along the a, b and c axes which do show a degree of anisotropy.
1：Experimental Design and Method Selection:
Transmission electron microscopy techniques were used to analyze the effect of swift heavy ion irradiation on YAP and YAG single crystals. The crystals were irradiated with Kr, Xe, and Bi ions with energies ranging from 107 to 1030 MeV.
2：Sample Selection and Data Sources:
Bulk single crystalline YAP and YAG crystals were used as target materials. High energy ion irradiation was performed with the IC-100 and U-400 cyclotrons at the Flerov Laboratory for Nuclear Reactions (FLNR) at the Joint Institute for Nuclear Research (JINR) in Dubna, Russia and the DC-60 cyclotron at the Inter-Disciplinary Research Complex (IRC) in Astana, Kazakhstan.
3：List of Experimental Equipment and Materials:
Planar TEM lamella were prepared by means of an FEI Helios Nanolab
4：Analysis was done with a JEOL ARM200F transmission electron microscope (TEM) operated at 200 kV. Experimental Procedures and Operational Workflow:
6 The target materials were irradiated with Xe, Kr, and Bi ions with energies ranging from 107 to 1030 MeV and fluences of between 1011 and 1012 cm?
5：Some samples were also irradiated through Al degraders in order to modify the initial stopping power of the ion. Data Analysis Methods:
Experimental measurements for tracks diameters were done from high angle annular dark field (HAADF) STEM images. All images in this investigation were post processed with smart align.
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