Korean Journal of Materials Research, Vol.13, No.8, 503-508, August, 2003
V2O5 도핑된 NiCuZn 페라이트로 제조된 칩인덕터에서의 Ag/cu 석출
Ag and Cu Precipitation in Multi-Layer Chip Inductors Prepared with V 2 O 5 Doped NiCuZn Ferrites
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The purpose of this study is to investigate the effect of V 2 O 5 addition on the Ag and Cu precipitation in the NiCuZn ferrite layers of 7.7 × 4.5 × 1.0 mm sized multi-layer chip inductors prepared by the screen printing method using 0∼0.5 wt% V 2 O 5 -doped ferrite pastes. With increasing the V 2 O 5 content and sintering temperature, Ag and Cu oxide coprecipitated more and more at the polished surface of ferrite layers during re-annealing at 840 ? C . It was thought that during the sintering process, V dissolved in the NiCuZn ferrite lattice and the Ag-Cu liquid phase of low melting point was formed in the ferrite layers due to the Cu segregation from the ferrite lattice and Ag diffusion from the internal electrode. During re-annealing at 840 ? C , the Ag-Cu liquid phase came out the polished surface of ferrite layers, and was decomposed into the isolated Ag particles and the Cu oxide phase during the cooling process.
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