Multifunctional SrTiO3/NiZn ferrite/POE composites with eletromagnetic and flexible properties for RF applications

Self Cite

The coexistence of Li2MoO4 (LMO) and Ni0.5Zn0.5Fe2O4 (NZO) has been proven and their low‐temperature‐sintered magneto‐dielectric composites (1−x)LMO–xNZO (volume fraction factor x = 0.1, 0.3, 0.5, 0.7) were prepared by the conventional solid‐state reaction method and were sintered below 700°C. It is found that the optimal sample (x = 0.5) has good and relatively stable magneto‐dielectric performance in the frequency range from 10 MHz to 1 GHz with permittivity between 7.14 and 6.84, dielectric loss tangent between 0.09 and 0.02, and permeability between 5.23 and 3.30, magnetic loss tangent between 0.06 and 0.65, respectively. Furthermore, the verified chemical compatibility with silver indicates that the LMO–NZO ceramics are potential for low‐temperature cofired ceramic application and their multifunctional magneto‐dielectric properties also make them for potential applications in electronic devices.

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Low‐Temperature Sintering Li₂MoO₄/Ni_0.5Zn_0.5Fe₂O₄ Magneto‐Dielectric Composites for High‐Frequency Application

Zhou

Yang

et al. 2014

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“…For the polymer‐based magneto‐dielectric composites, lower dielectric and magnetic loss tangent are often observed. However, the permittivity and permeability of them are low due to the low volume fraction of magnetic phase in these composites . Also, these polymer‐based composites are unable to be used above 200°C.…”

Section: Introductionmentioning

confidence: 99%

Low Loss Magneto‐Dielectric Composite Ceramics Ba₃Co₂Fe₂₄O₄₁/SrTiO₃ for High‐Frequency Applications

Chang

Wang

2014

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Magneto-dielectric composite ceramics Ba 3 Co 2 Fe 24 O 41 /SrTiO 3 (Co 2 Z/STO) loading with high volume fraction of hexaferrite Co 2 Z (f Co2Z = 60%-95%) are successfully prepared by a hybrid process. The microstructures with homogeneously dispersed constituent grains are observed in these composites. The composites loading with 60%-80% hexaferrite possess stable magneto-dielectric properties in the frequency range from 10 MHz to 1 GHz with both low dielectric loss and magnetic loss. For the composite loading with 60% Co 2 Z, the relative permittivity is 28.08 and permeability is 4.46 (at 10 MHz), the dielectric loss tangent keeps below 0.009 within the frequency range from 10 MHz to 1 GHz. Also, it possesses a magnetic loss tangent of 0.006 and 0.144 at 50 MHz and 1 GHz, respectively, which are much lower than 0.056 and 1.242 of the single Co 2 Z phase at the same frequency. These excellent properties indicate that the low-loss Co 2 Z/STO composite ceramic is a new kind of multifunctional magneto-dielectric material with potential for high-frequency electromagnetic device applications.

“…However, the traditional ferrites (Mn–Zn, Ni–Zn ferrite, for example) with high permeability always show high dielectric loss from low‐frequency range to microwave region . Moreover, although the popular magneto–dielectric composites in polymer matrix possess lower dielectric and magnetic loss, their permittivity and permeability are also very low, which are limited by the low volume fraction of the magnetic ceramic powders . Meanwhile, these composites can hardly be used at a high temperature above 200°C.…”

Section: Introductionmentioning

confidence: 99%

A Novel Magneto‐Dielectric Solid Solution Ceramic 0.25LiFe₅O₈–0.75Li₂ZnTi₃O₈ with Relatively High Permeability and Ultra‐Low Dielectric Loss

Zhou

Yang

et al. 2012

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In this study, a 0.25LiFe 5 O 8 -0.75Li 2 ZnTi 3 O 8 solid solution ceramic was developed via the solid-state reaction method. Its phase evolution, microstructure, and sintering behavior were investigated and it was found that the 25 mol.% LiFe 5 O 8 phase is almost fully soluble in Li 2 ZnTi 3 O 8, and only the Li 2 ZnTi 3 O 8 type spinel phase was formed in the 0.25LiFe 5 O 8 -0.75Li 2 ZnTi 3 O 8 ceramic. The ceramic sample sintered at 1050°C for 2 h was found to possess both good magnetic properties and dielectric properties in the frequency range from 1 to 10 MHz, with permeability between 38.2 and 15 and magnetic loss tangent between 0.25 and 0.75, permittivity between 19.6 and 19.3 and dielectric loss tangent between 8 3 10 À3 and 2 3 10 À3 . The sample also possesses good microwave dielectric properties with a relative permittivity of 19.1, a high quality factor (Qf)~11,770 GHz (at 6.84 GHz). The ceramic is a novel magneto-dielectric ceramic with both high permeability and good dielectric properties, which might be a good candidate for the applications in novel electronic devices.H. Jantunen-contributing editor Manuscript No. 31581.