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Publisher DOI: 10.1063/1.5130419
Title: Ga-, Y-, and Sc-substituted M-type ferrites for self-biasing circulators in LTCC microwave modules
Language: English
Authors: Heidenreich, Manuel 
Ma, Xinyi 
Gitzel, Wanja Mario 
Jacob, Arne 
Capraro, Beate 
Töpfer, Jörg 
Issue Date: 11-Feb-2020
Publisher: American Inst. of Physics
Source: AIP Advances 2 (10): 025315-1-025315-7 (2020-02)
Journal or Series Name: AIP Advances 
Abstract (english): The partial substitution of Fe3+ by diamagnetic Me3+ in BaMexFe12-xO19 with Me = Ga and Y (0 ≤ x ≤ 2) was studied. Samples were synthesized by the mixed-oxide route and their properties were compared to BaScxFe12-xO19 ferrites. It was shown by XRD that the hexagonal lattice parameters with x for Me = Ga and Sc vary continuously. For Me = Y no single-phase ferrites were obtained indicating that the solubility limit for Y in Ba ferrite is very limited. For Me = Ga and Sc, the saturation magnetization at room temperature is reduced with x. The coercivity as well as the ferromagnetic resonance frequency remain almost unchanged for Ga-substituted ferrites, whereas for Sc-substituted ferrites the coercivity and ferromagnetic resonance frequency decrease with x. Thick films of Sc-ferrite (x = 0.5) were screen-printed onto LTCC tape substrates and post-fired at 900°C. Application of a magnetic field during drying allows fabrication of textured ferrite layers. Alternatively, ferrite tapes and LTCC tapes were successfully co-fired at 900°C.
DOI: 10.15480/882.2719
ISSN: 2158-3226
Institute: Hochfrequenztechnik E-3 
Type: (wissenschaftlicher) Artikel
Funded by: Funding and support of the German Aerospace Center (DLR) on behalf of the German Federal Ministry of Economics and Technology (BMWi) under grant 50YB1720.
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