ChemInform Abstract: BaO‐TiO2‐WO3 Microwave Ceramics and Crystalline BaWO4.

Nishigaki, Susumu; Yano, Shinsuke; Kato, Hitoshi; Hirai, T.; Nonomura, Toshio

doi:10.1002/chin.198814367

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“…As BaWO 4 is a promising microwave dielectric material [21], and BST is often modified by different microwave dielectrics, such as MgO, MgTiO 3 , MgAl 2 O 4 , Mg 2 SiO 4 et al [22][23][24][25][26], to achieve improved microwave tunable properties, the presence of BaWO 4 could be an additional benefit for BST ceramics. Dielectric properties of BST ceramics derived from the nano-powders will be reported separately.…”

Section: Contents Lists Available At Sciencedirectmentioning

confidence: 99%

A simple method to synthesize Ba0.6Sr0.4TiO3 nano-powders through high-energy ball-milling

Liu

et al. 2011

Powder Technology

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Section: Contents Lists Available At Sciencedirectmentioning

confidence: 99%

A simple method to synthesize Ba0.6Sr0.4TiO3 nano-powders through high-energy ball-milling

Liu

et al. 2011

Powder Technology

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Development of Patch Antenna Substrate in BaO-4.TiO<sub>2</sub> System

Sreemoolanadhan

Masin

Mathew

2015

MSF

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BaTi4O9(BT4), has dielectric constant (εr)≈36 and unloaded Q-factor (Qf) >35,000GHz, but has temperature coefficient of frequency (τf~16-20ppm/°C). Ba2Ti9O20(B2T9), very near to BT4 in the BaO-TiO2phase diagram, has εr~38, Qf~35,000GHz and τf<4ppm/°C. Though this phase is selected for most of the applications, there are many challenges like slow formation, decomposition, reaction with substrate etc. But, BT4 formed quickly and densified easily, but only high τf precluded it from many practical applications. Most of the literature on the modification of BT4 decreased the εr≤35. Here, the preparation and properties of ZnO/ZnTiO3added BaTi4O9ceramics are reported. The ceramics have been prepared by the solid state method. Raw materials have been homogenized and calcined at 1125°C. Calcined powders are ball-milled, compacted and sintered in 1275−1350°C to get dense ceramics with ρ=4.38-4.44 g/cc (TD>97.5%). XRD analysis has confirmed the BaTi4O9phase formation along with secondary phases. FeSEM microstructures show liquid phase assisted sintering leading to fused grains and exaggerated grain growth. The dielectric properties have been measured near 4GHz by standard rod resonator methods using cylindrical specimens. The ceramics have εr36.5−38, τf<11ppm/°C and Qf>17THz. It is possible to further improve the Qf of these ceramics by controlling the processing.

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ChemInform Abstract: BaO‐TiO2‐WO3 Microwave Ceramics and Crystalline BaWO4.

Abstract: The effect of WO3 addition on the microwave properties (dielectric constant ε, high‐temp.

Cited by 2 publications

References 1 publication

A simple method to synthesize Ba0.6Sr0.4TiO3 nano-powders through high-energy ball-milling

A simple method to synthesize Ba0.6Sr0.4TiO3 nano-powders through high-energy ball-milling

Development of Patch Antenna Substrate in BaO-4.TiO<sub>2</sub> System

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