Sinterability studies and microwave dielectric properties of sol–gel synthesized Ba(Zn1/3Ta2/3)O3 nanoparticles
Sinterability studies and microwave dielectric properties of sol–gel synthesized Ba(Zn1/3Ta2/3)O3 nanoparticles
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溶胶-凝胶合成Ba(Zn1/3Ta2/3)O3纳米颗粒的烧结性研究和微波介电性能
DOI：
10.1016/j.jallcom.2007.02.136
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发表时间：
2008
影响因子：
6.2
通讯作者：
P. C. R. Varma
中科院分区：
文献类型：
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作者：
M. Varma;P. Nisha;P. C. R. Varma
采用溶胶-凝胶法和干凝胶热解法制备了纳米级纯BaZT粉末。在不同的高温下对粉末进行热解，考察了热解温度对粉末粒度的影响。由纳米粉末制成的BZT陶瓷具有很高的烧结性。因此，烧结后的显微组织显示出非常大的晶粒。然而，烧结纳米粉末的烧结体密度和微波介电性能较差。致密化差的原因是在烧结过程中形成了大量的晶间气孔和剧烈的晶粒长大。用焙烧的BZT粉末对样品进行消声烧结。在焙烧后的纳米粉末中加入不同的烧结助剂，然后进行烧结。研究发现，大部分掺杂都促进了烧结组织的晶粒长大。当平均离子半径约为0.615？时，部分掺杂可使共振频率温度系数降至零。
Nanosized phase pure powder of Ba(Zn1/3Ta2/3)O3(BZT) was prepared by sol–gel method and subsequent pyrolysis of the dried gel. The powders were pyrolyzed at different elevated temperatures and the effect of pyrolysis temperature on particle size was investigated. The sinterability of BZT ceramics made from nanopowders was found to be very high. Hence the sintered microstructure shows very large grains. However sintered density and microwave dielectric properties of sintered nanopowders were found to be poor. Reason for the poor densification was found to be the formation of large amounts of intergranular porosity and drastic grain growth during sintering. The samples were sintered by muffling with calcined BZT powder. Different sintering additives were added to calcined nanosized powders and then sintered. Most of the dopants are found to promote grain growth of sintered microstructure. Some of the dopants are found to reduce temperature coefficient of resonant frequency to zero when the average ionic radius was about 0.615Å.
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