Tunable microwave dielectric properties in SrO‐V₂O₅ system through compositional modulation

Abstract

Adjustment on resonance frequency stability against the sintering temperature of Sr3V2O8 was realized by adjusting the Sr:V mole ratio. Effects of Sr:V ratio on sintering behavior and dielectric properties of Sr3V2O8 were studied. The sintering temperature was sucessfully reduced to 950°C from 1150°C. With increasing vanadium content, both relative permittivity and quality factor decreased, while the temperature coefficient of resonance frequency shifted from positive to negative values. Especially, a near‐zero τf of −1.1 ppm/°C along with a low permittivity (εr) of 9.8 and a quality factor Q × f of 24 120 GHz was successfully achieved in Sr3‐yV2O8‐y ceramic (y = 0.6, sintered at 950°C). The wide compositional and processing adjustment window, favorable dielectric performances, and good chemical compatibility with silver render Sr3‐yV2O8‐y ceramics potential candidates in multilayer electronic devices.

Effects of (Mg1/3Sb2/3)4+ substitution on the structure and microwave dielectric properties of Ce2Zr3(Mg1/3Sb2/3)3-3(MoO4)9 ceramics

“…5. The apparent densities of the major sample was an approximate value of 3.80 g/cm 3 and relative density also has reached more than 95%. It is noticeable that the good degree of densification was in accord with the SEM results.…”

“…The peaks of sintered ceramics assigned to the standard data for Pr2Zr3(MoO4)9 (JCPDS No. 52-0688), which indicated that the Pr2Zr3(MoO4)9-like crystal structure with a 3 Rc space group was obtained. According to the result, the composition of the crystal phase is not changed by the content of (Mg1/3Sb2/3) 4+ ions substitution [14].…”

“…ConclusionCe2[Zr1-x(Mg1/3Sb2/3)x]3(MoO4)9 (x=0.02, 0.04, 0.06, 0.08 and 0.10) ceramics were fabricated well via the traditional solid-state method. The pure-phase with space group of3 Rc was detected for all specimens. The dense micro-structure and clear grain boundary of the specimens can be observed in SEMphotos.…”

“…Recently, researchers focused on novel microwave dielectric ceramics. At the same time, some researchers have been widely investigated the substitution of cationic and composite ceramics to improve the dielectric properties of microwave dielectric materials [3][4][5]. In addition, high cost limits the application of these ceramics, and consequently it is required to reduce their sintering temperature.…”

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Ce2[Zr1-x(Mg1/3Sb2/3)x]3(MoO4)9 (0.02≤x≤0.10) ceramics were prepared by the traditional solid-state method. A single phase, belonging to the space group of 3 Rc , was detected by using X-ray diffraction at sintering temperatures ranging from 700 °C to 850 °C. The microstructures of samples were examined by applying scanning electron microscopy.

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