Magnetic Crystal for Radio Wave Absorbing Material and Radio Wave Absorber

PROBLEM TO BE SOLVED: To provide a magnetic crystal having a novel structure which is suitable for a radio wave absorber having a peak of a radio wave absorbing quantity at a frequency band of 25-160 GHz. ; SOLUTION: The magnetic crystal for a radio wave absorbing material has the structure of [epsilon]-MxFe2-xO3in which, with a space group identical with a [epsilon]-Fe2O3crystal, a part of an Fe site of the [epsilon]-Fe2O3crystal is replaced with M, where 02O3crystal by the replacement. Specifically, the M element is Al, Ga or the like. The radio wave absorber having a filling structure of particles which has "M replacement [epsilon]-Fe2O3crystal" where the replacement element M is added as a magnetic phase can be controlled for a frequency of the radio wave absorbing peak by an amount of the replacement of the M element. A radio wave absorber, for example, which is adaptive to a 76 GHz band used for an onboard radar is obtained. ; COPYRIGHT: (C)2009,JPO&INPIT

The present invention relates to a magnetic crystal comprising an [epsilon]-Fe2O3-based iron oxide, which is a magnetic crystal suitable for electromagnetic wave absorbers for use in a high-frequency band of 25 GHz or more, as well as to an electromagnetic wave absorbing material and an electromagnetic wave absorber comprising it.

As a result of detailed investigations, the present inventors have clarified that a magnetic crystal derived from an [epsilon]-Fe2O3 crystal by substituting a part of the Fe site therein with a trivalent metal element can attain the above-mentioned object.

Specifically, the present invention provides a magnetic crystal for electromagnetic wave absorbing materials, having a structure of [epsilon]-MxFe2-xO3 with 0 < x < 1, which has the same space group as that of an [epsilon]-Fe2O3 crystal and which is derived from an [epsilon]-Fe2O3 crystal by substituting a part of the Fe site therein with M. [epsilon]-MxFe2-xO3 derived from an [epsilon]-Fe2O3 crystal by substituting a part of the Fe site therein with M may be hereinafter referred to as "M-substituted [epsilon]-Fe2O3".

Attached files:
JP 2008277726.jpg

Patents:
JP 2,008,277,726

Inventor(s): OGOSHI SHINICHI; KUROKI SHIRO; SAKURAI SHUNSUKE; IKUI ASUKA; SATO KIMITAKA; SASAKI SHINYA

Type of Offer: Sale



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