ISSN 0862-5468 (Print), ISSN 1804-5847 (online) 

Ceramics-Silikáty 60, (2) 122 - 128 (2016)


INFLUENCE OF MnO₂ ADDITIONS TO BaNd₂Ti₄O₁₂ MICROWAVE CERAMICS ON SINTERING BEHAVIOR AND DIELECTRIC PROPERTIES
 
Fang Zi-xuan, Tang Bin, Long Ming-Zhu, Zhang Shu-ren
 
School of Microelectronics and Solid State Electronics, University of Electronic Science and Technology of China, Chengdu 610054, China

Keywords: BaNd₂Ti₄O₁₂, Microwave ceramics, Dielectric properties, Microstructure
 

The sintering behaviors and microwave dielectric properties of BaNd₂Ti₄O₁₂ (BNT4) ceramics with x wt.% MnO₂ dopants (x=0, 1, 2, 3 and 4) were investigated in this paper. The tungsten-bronze type BaNd₂Ti₄O₁₂ accompanied with a certain amount of Ba₂Ti₉O₂₀ secondary phase was observed for all Mn doped compositions when samples were sintered at 1300°C. Manganese substitution for Ti caused a decrease of the lattice parameters, and the addition of MnO₂ effectively improved the densification and lowered the sintering temperature of ceramics, which was closely related to the liquid phase sintering mechanism. The microstructure was homogeneous fine grained when x equaled to 3. At last, the BNT4 with 3.0 wt.% MnO₂ dopants well-sintered at 1300°C for 1h had good microwave dielectric properties of ɛr=90.2,Qxf=5225GHz and τf=9.7 ppm/°C.


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doi: 10.13168/cs.2016.0018
 
 
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