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Journal of Advanced Ceramics  2016, Vol. 5 Issue (4): 277-283    doi: 10.1007/s40145-016-0200-6
Research Article     
A new sintering approach to ceramics at low temperature from Ba(ZrxTi1-x)O3 nanoparticles doped by ZnO
Rui GUOa,Jianquan QIa*,Jiali LUOa,Xiaoyu DONGa,Longtu LIb
aSchool of Nature Resources & Materials Science, Northeastern University at Qinhuangdao, Qinhuangdao, Hebei 066004, China
bState Key Laboratory of Fine Ceramics and New Processing, Tsinghua University, Beijing 100084, China
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Abstract  

The sintering temperature decreases theoretically with the grain size of the ceramic powders, but it is not always right for fine grain sized nanopowders due to the inevitable agglomerations, and thus pores are hard to eliminate thoroughly during sintering. To overcome this difficulty, a new approach is designed to sintering ceramics at low temperature from nanoparticles. In this scheme, excessive dopants, such as ZnO, are synthesized into the nanoparticles, and they would be liberated again on the surfaces of the grains at high temperature as sintering aids homogenously to promote densification. Here, we compared the ceramic sintering of ZnO-doped barium zirconate titanate (BaZrxTi1-xO3, BZT) nanoparticles with BZT nanoparticles using ZnO as additive at 1150 ℃. Both kinds of nanoparticles were directly synthesized by the same process at room temperature and yielded the same initial grain size of ~10 nm. The dense BZT ceramic with relative density of 99% was fabricated from the 2 mol% ZnO-doped nanoparticles. On the other hand, the porous BZT ceramic with density of 78% was obtained from nanoparticles with 2 mol% ZnO as additive. Therefore, our strategy to ceramic sintering at low temperature from nanoparticles was confirmed.



Key wordsbarium zirconate titanate (BaZrxTi1-xO3, BZT)      nanopowder      direct synthesis      sintering     
Received: 25 May 2016      Published: 20 December 2016
Corresponding Authors: Jianquan QI   
Cite this article:

Rui GUO,Jianquan QI,Jiali LUO,Xiaoyu DONG,Longtu LI. A new sintering approach to ceramics at low temperature from Ba(ZrxTi1-x)O3 nanoparticles doped by ZnO. Journal of Advanced Ceramics, 2016, 5(4): 277-283.

URL:

http://jac.tsinghuajournals.com/10.1007/s40145-016-0200-6     OR     http://jac.tsinghuajournals.com/Y2016/V5/I4/277

Fig. 1 Description of (a) conventional ceramic sintering and (b) strategy of the new approach from nanoparticles.
Fig. 2 SEM of ZnO-doped BZT nanoparticles.
Fig. 3 XRD profile of as-prepared pure BZT and ZnO-doped BZT nanoparticles.
Fig. 4 Dilatometry measurements for the samples.
Fig. 5 SEM of the sample 1 with the dense structure and homogenous grain size.
Fig. 6 SEM of the samples: (a) the sample 0, (b) the sample 1.
Fig. 7 Dielectric properties of the samples.
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