Murata Manufacturing Co., Ltd.

Tomoyuki Ankyu

Atsushi Yamamoto

Yuko Fujita

Akihiro Nakamura

Osamu Naito

Yuko Nomiya

Wataru Kanami

A laminated coil component includes a magnetic body part made of a Ni&#x2014;Zn-based ferrite material and a coil conductor containing Cu as a main component, which is wound into a coil shape, and the coil conductor is embedded in the magnetic body part to form a component base. The component base is divided into a first region near the coil conductor and a second region other than the first region. The grain size ratio of the average crystal grain size of the magnetic body part in the first region to the average crystal grain size of the magnetic body part in the second region is 0.85 or less. The molar content of CuO in the ferrite raw material is set to 6 mol % or less, and firing is performed in a reducing atmosphere in which the oxygen partial pressure is an equilibrium oxygen partial pressure of Cu&#x2014;CuO or less.

Laminated coil component

This disclosure provides a ferrite ceramic composition, a ceramic electronic component including the ceramic composition, and a process of producing a ceramic electronic component including the ferrite ceramic composition, of which the insulation performance can be secured even when fired simultaneously with a metal wire material containing Cu as the main component, and which can have good electric properties. The ferrite ceramic composition includes an Ni&#x2014;Mn&#x2014;Zn-based ferrite having a molar content of CuO of 5 mol % or less and in which, when the molar content (x) of FeOand the molar content (y) of MnOare expressed by a coordinate point (x,y), the coordinate point (x,y) is located in an area bounded by coordinate points A (25,1), B (47,1), C (47,7.5), D (45,7.5), E (45,10), F (35,10), G (35,7.5) and H (25,7.5).

Ferrite ceramic composition, ceramic electronic component, and process for producing ceramic electronic component

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Kyoto, Japan

Tomoyuki Ankyu