Title:
POLYCRYSTAL MAGNETIC CERAMIC, MICROWAVE MAGNETIC SUBSTANCE, AND IRREVERSIBLE CIRCUIT ELEMENT USING THE SAME
Document Type and Number:
Japanese Patent JP2011073937
Kind Code:
A
Abstract:
To provide a polycrystal magnetism ceramic in which low-temperature firing is possible while controlling the formation of a hetero-phase, and the ferromagnetic resonance half value width and dielectric loss are small, and which has a temperature coefficient which compensates the temperature characteristic of a permanent magnet about saturation magnetization.
The polycrystal magnetic ceramic comprises Y-Fe based garnet ferrite comprising substituting a part of Y by Bi, and has a composition shown by the formula:(Ya-bM1b)(Fe8-a-cM2c)O12, wherein M1 is Bi and Ca, M2 is In, V, Cu, or Zr, a, b, and c are the atomic ratios, and 2.94≤a<3.0, 1.00≤b≤1.70, and 0.365≤c≤0.95 are satisfied.
Inventors:
NAKAJIMA HIROKAZU
KOYUHARA TOKUKAZU
KOYUHARA TOKUKAZU
Application Number:
JP2009228398A
Publication Date:
April 14, 2011
Filing Date:
September 30, 2009
Export Citation:
Assignee:
HITACHI METALS LTD
International Classes:
C04B35/40; H01F1/34; H01P1/383
Domestic Patent References:
| JP2007145705A | 2007-06-14 | |||
| JPH10233308A | 1998-09-02 | |||
| JPS5031400A | 1975-03-27 | |||
| JPS4972697A | 1974-07-13 |
Foreign References:
| WO2007052809A1 | 2007-05-10 |
Other References:
JPN6014025678; ＨＵＤＳＯＮ，Ａｎｄｒｅｗ Ｓ．: 'Ｓｕｂｓｔｉｔｕｔｉｏｎ ｏｆ Ｇａｄｏｌｉｎｉｕｍ， Ａｌｕｍｉｎｕｍ， ａｎｄ Ｉｎｄｉｕｍ ｉｎ Ｙｔｔｒｉｕｍ Ｃａｌｃｉｕｍ Ｖａｎａｄｉｕｍ Ｇａｒｎｅｔｓ' ＩＥＥＥ Ｔｒａｎｓａｃｔｉｏｎｓ ｏｎ Ｍａｇｎｅｔｉｃｓ Ｖｏｌ．Ｍｇａ-５， Ｎｏ．３， ｐｐ．６１０-６１３, 196909, Ｉｎｓｔｉｔｕｔｅ ｏｆ Ｅｌｅｃｔｒｉｃａｌ ａｎｄ Ｅｌｅｃｔｒｏｎｉｃｓ Ｅｎｇｉｎｅｅｒｓ；
Attorney, Agent or Firm:
Takaishi Tachibana
Previous Patent: METHOD FOR MANUFACTURING CRYSTALLIZED GLASS
Next Patent: ULTRA HIGH-EARLY-STRENGTH CEMENT COMPOSITION
Next Patent: ULTRA HIGH-EARLY-STRENGTH CEMENT COMPOSITION