Abstract
The structural disorder, heat capacity, resistivity, Hall effect, and magnetic susceptibility of polycrystalline chemical-vapor-deposited diamond irradiated with fast neutrons at temperature of $(325\ifmmode\pm\else\textpm\fi{}10)\text{ }\text{K}$ at high fluences $\ensuremath{\Phi}=(1--5)\ifmmode\times\else\texttimes\fi{}{10}^{20}\text{ }{\text{cm}}^{\ensuremath{-}2}$ were investigated. Despite a significant increase in unit-cell volume $(\ensuremath{\sim}4.5%)$, the crystalline structure remains stable in this fluence range. The irradiation results in a paramagnetic contribution to magnetic susceptibility and to a strong (by 4 orders of magnitude) increase in heat capacity at low temperatures $(Tl20\text{ }\text{K})$ due to electron contribution with a $T$ dependence characteristic of multilevel electron systems (the Schottky anomaly).
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