Spark plug a plasma jet. / p & & p & the spark plug a plasma jet according to the present invention comprises an electrical insulator 3 form of a cavity 4 of discharge, and a plurality of electrodes communicating with the cavity of discharge to form, at the interior of the cavity of discharge, a spark gap. The plurality of electrodes comprises a central electrode 1 connected to a high voltage electrical source 20a and has a low voltage electrical source, 1b, and an electrode peripheral 2 which is connected to the ground. The electrode peripheral 2 encloses the cavity of discharge, and comprises an opening 5 of the passage of the jet. The part of the electrode, which communicates with the cavity of discharge is formed by a material chosen from among a group comprising a ferrite, a nickel alloy containing at least one of the metals of silicon, aluminium and magnesium, and a conducting ceramic of
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