We report on the 29Si nuclear spin decoherence time at room temperature for apure (99.99999%, 7N) and carrier-less (p-type, doping level of 10^15cm-3)silicon in which 29Si nuclei are naturally abundant (4.7%). Despite theexperimental difficulties coming from the extremely long spin-latticerelaxation time T1 (of the order of 10^4 s), we have successfully observed aseries of spin-echoes of which the time dependence is characterized by thedecoherence time T2. We found that the decoherence process deviates from asingle Gaussian or Lorentzian function but is well-reproduced by abi-exponential function with the shorter T2S = 15\pm5 ms and the longer T2L =200\pm20 ms.
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