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arXiv · 2610.10191

Prediction of the thermal neutron response of grain-boundary impedance in Gd-doped ceria based on the radiation-ionic effect

Zhongming Zhang
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Abstract

The radiation-ionic effect was reported in 3 mol% Gd-doped CeO$_2$ (3GDC): under $^{60}$Co gamma irradiation at 35 Gy/min, the grain-boundary (GB) ionic resistance of a bulk pellet decreased 680-fold at room temperature because radiation-generated electrons trapped at the GB core lower the space-charge potential. The effect has only been demonstrated with photons. Here the response of 3GDC to thermal neutrons is predicted. Neutrons are absorbed by $^{157}$Gd (254 kb); about 50 keV per capture is deposited within 1 $μ$m by conversion and Auger electrons, and Gd segregates to the GBs, so the energy is delivered to the interfaces that block ionic transport. This source term is expressed as a GB-effective generation rate and used in the Mott-Schottky/Seager framework calibrated on the published gamma data. The gamma temperature series fixes the temperature dependence of the single trap parameter (about 1.1 eV), and this calibration reproduces the trap parameter obtained from independent thin-film UV data at 400 $^\circ$C. A thermal flux of $6\times10^{9}$ cm$^{-2}$s$^{-1}$ gives the same GB-effective generation rate as the 35 Gy/min calibration. At room temperature the predicted GB resistance ratio is about 150 (90% interval 100-290) at $10^{9}$ and about 1300 (900-2500) at $10^{10}$ cm$^{-2}$s$^{-1}$; the response vanishes above 60 $^\circ$C at $10^{9}$ and 80 $^\circ$C at $10^{10}$. Because capture events are discrete, the continuous-source description holds only if the trapped charge of one event outlasts the next; this is met at $10^{10}$ and marginal at $10^{9}$, so the recovery time constant is the first quantity a neutron experiment should measure. Self-shielding is partly offset by Compton absorption of the capture photons; above 5 mol% Gd the response is limited by the weak dark barrier. Source parameters, sample geometry and controls needed to test the prediction are given.

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Zhongming Zhang. 2026-10-07. Prediction of the thermal neutron response of grain-boundary impedance in Gd-doped ceria based on the radiation-ionic effect. https://arxiv.org/abs/2610.10191

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