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Oral presentation

Site preference and magnetic structural study on BaTiMnFe$$_{10}$$O$$_{19}$$ by neutron and X-ray diffraction

Takayasu, Shunichi*; Yoshizaki, Jumpei*; Okube, Maki*; Toyoda, Takeshi*; Igawa, Naoki; Sasaki, Satoshi*

no journal, , 

Hexagonal barium ferrites have been traditionally used as permanent magnets and microwave devices because of their high coercivity and large uniaxial anisotropy. It is recognized that the magnetic anisotropy can be optimized by Fe$$^{3+}$$ ion for several magnetic and non-magnetic ions, which makes M-type ferrites suitable for microwave absorber in 1 - 75 GHz range. In this study to use neutron and X-ray powder diffraction, site preference and magnetic structure of iron sites on BaTiCoFe$$_{10}$$O$$_{19}$$ are examined.

Oral presentation

Site preference and magnetic structure of M-type BaTiMnFe$$_{10}$$O$$_{19}$$ ferrite determined by X-ray and neutron diffraction methods

Takayasu, Shunichi*; Yoshizaki, Jumpei*; Okube, Maki*; Toyoda, Takeshi*; Igawa, Naoki; Sasaki, Satoshi*

no journal, , 

Site preferences of Ti and Mn and the magnetic structure of M-type BaTiMnFe$$_{10}$$O$$_{19}$$ ferrite were analyzed using the X rays and neutron powder diffraction method. The intensity difference on the magnetic scattering was clearly observed below and above the ${it T}$c, showing the ferrimagnetic spin arrangement along with the ${it c}$ axis. Site-occupancy refinements give the results that Ti ions occupy the 4${it f}$1 (24%), 2${it a}$ (15%) and 2${it b}$ (15%) sites, while Mn ions prefer to 4${it f}$2 (24%) and 12${it k}$ (24%). Magnetic moments were obtained from the Rietveld refinements, which are 3.56, 3.37, -3.86, -3.72 and 3.68 $$mu$$$$_{B}$$ at ${it T}$ = 8 K for 2${it a}$, 2${it b}$, 4${it f}$1, 4${it f}$2 and 12${it k}$ sites, respectively.

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