FIELD: investigating or analyzing materials.
SUBSTANCE: method comprises setting one of the crystallographic planes of monocrystal of oxide bronze in coincidence with the flat working surface of the thermal emitter, pumping air between the surface of the thermal emitter and auxiliary electrode, recording background ion current of the thermal emitter, and determining the intervals of operation temperatures of the thermal emitter from the temperature dependence of the background current.
EFFECT: enhanced efficiency.
4 cl, 2 dwg, 1 tbl
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