2015 Fiscal Year Final Research Report
Elucidation of mechanism on coersivity of (Sr,Ca)-La-Co ferrite with boundary phase analysis
Project/Area Number |
25820126
|
Research Category |
Grant-in-Aid for Young Scientists (B)
|
Allocation Type | Multi-year Fund |
Research Field |
Electronic materials/Electric materials
|
Research Institution | Meiji University |
Principal Investigator |
Obara Gaku 明治大学, 理工学部, 准教授 (20343618)
|
Project Period (FY) |
2013-04-01 – 2016-03-31
|
Keywords | Ca-La-Co系フェライト / 保磁力 / 粒界相 / 析出物 |
Outline of Final Research Achievements |
To clarify the mechanism of corecivity of Ca-La-Co sintered magnets we examined the effects of redundant calcium on both chemical deposits between the particles and the magnetic properties of Ca-La-Co sintered magnets. The results are as follows: [1] The relationship between the values of redundant calcium prepared for the stoichiometry of the magnetoplumbyte and the deposits of calcium compounds on the sintered samples without sintering agent inter-additives is proportional. [2] The deposits of calcium compounds on sintered samples remain constant with an increase in the total value of redundant calcium until 0.8 wt.% (in CaO equivalent); then deposits rapidly increase. [3] All calcium compounds in the boundary face of several particles are built up by a Ca-Si compound as the mole ratio Ca:Si=2:1 (Ca2SiO4). [4] The corcivities of sintered magnets with sintering agent inter-additives decrease with an increase in the value of calcium compound deposits.
|
Free Research Field |
電子電気材料
|