INFLUENCE OF MnO₂ ADDITIONS TO BaNd₂Ti₄O₁₂ MICROWAVE CERAMICS ON SINTERING BEHAVIOR AND DIELECTRIC PROPERTIES
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...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
University of Chemistry and Technology, Prague
2016-05-01
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| Series: | Ceramics-Silikáty |
| Subjects: | |
| Online Access: |
http://www.ceramics-silikaty.cz/index.php?page=cs_detail_doi&id=155
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| Summary: | 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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| ISSN: | 0862-5468 1804-5847 |