Magnetic crystal for radio wave absorbing material and radio wave absorbent

Disclosed is 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 sit...

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Bibliographische Detailangaben
Hauptverfasser:	KUROKI SHIRO, SASAKI SHINYA, NAMAI ASUKA, SHINICHI OHKOSHI, SAKURAI SHUNSUKE, SATO KIMITAKA
Format:	Patent
Sprache:	chi ; eng
Schlagworte:	ARTIFICIAL STONE BASIC ELECTRIC ELEMENTS CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS CEMENTS CERAMICS CHEMISTRY COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDINGMATERIALS COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSESC01D OR C01F CONCRETE ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR ELECTRICITY INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OFSOLID INORGANIC COMPOUNDS INDUCTANCES INORGANIC CHEMISTRY LIME, MAGNESIA MAGNETS MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS MANUFACTURE OR TREATMENT OF NANOSTRUCTURES MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES METALLURGY NANOTECHNOLOGY PERFORMING OPERATIONS PRINTED CIRCUITS REFRACTORIES SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES SLAG SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES TRANSFORMERS TRANSPORTING TREATMENT OF NATURAL STONE
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Beschreibung
Zusammenfassung:	Disclosed is 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. In this, M is a trivalent element having an effect of lowering the coercive force Hc of [Epsilon]-Fe2O3 crystal by the substitution. Concretely, the element M includes Al and Ga. An electromagnetic wave absorber having a packed structure of particles having such a substituent element M-added 'M-substituted [Epsilon]-Fe2O3 crystal' as the magnetic phase may control the electromagnetic wave absorption peak frequency depending on the degree of substitution with the element M, and for example, the invention gives an electromagnetic wave absorber applicable to a 76 GHz band for on-vehicle radars.