The invention discloses a
nickel zinc ferrite material used in a high-frequency
electrodeless lamp power coupler and a preparation method, wherein the main phase of the
nickel zinc ferrite material is a
spinel structure which comprises Fe2O3, ZnO, CuO, NiO and CoO, is characterized in that: the content of each composition is as follows as calculated according to
oxide: Fe2O3 is 45 to 49 mol percent; ZnO is 23 to 31 mol percent; CuO is 2.5 to 4.8 mol percent; NiO is 14 to 25 mol percent; and CoO is 0.5 to 1.2 mol percent. The
nickel zinc ferrite material, which has higher resistivity, has extremely low electromagnetic loss under high-temperature heavy current and particularly under 2.5 MHz to 3 MHz
high frequency; meanwhile, the quality factor Q of the
nickel zinc ferrite material is more than 200 all the time; therefore, the
nickel zinc ferrite material effectively solves the problems that a high-frequency
electrodeless lamp power coupler has low efficiency and
high heat productivity. Moreover, the
nickel zinc ferrite material also has excellent temperature stability, and the
initial permeability of the material is always kept between 300 and 400 under a broad temperature range
ranging from minus 20 DEG C to plus 100 DEG C; meanwhile, the specific
temperature coefficient of the material is less than 9.0x10<-6>, which is propitious to maintain the operating stability of a power coupler.