Fuji Electrochemical Co., Ltd.

Utsuo Kihara

Michihiro Torii

Hirohito Goto

Kazuhisa Yamazaki

Isamu Sasaki

Kazuaki Endo

Mitsuru Kojima

Yasuo Suzuki

Dielectric filter and method of manufacturing the same

A new method for preparation of Mn-Zn or Ni-Zn type ferrite single crystals. The ferrite materials are provided in a lower portion of a crucible and completely dissolved. The crucible is moved within a predetermined atmosphere of temperature gradient. A solid which is equilibrium in composition to the ferrite materials is supplied into the crucible while the dissolved ferrite materials are crystallizing from the lower extremity while a liquid-phase zone is maintained constant in depth. Ferrite single crystals of at least about 800 mm in length are grown which are homogeneous in composition throughout their length.

Process for producing ferrite single crystals

A process for producing Ni-Mn-Zn ferrite single crystal for high frequency wherein a sample comprising 10-30 molar percent of NiO, 1.8-12 molar percent of MnO, 15-35 molar percent of ZnO and 49-53 molar percent of Fe.sub.2 O.sub.3 is melted and subjected to growing into a crystal under an oxygen partial pressure of below about 100 Kg/cm.sup.2.

Process for producing ferrite single crystal for high frequency

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Kosai, Japan

Utsuo Kihara