(1-x)BiFeO3-xCoFe2O4复合陶瓷介电性能的研究
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陕西省教育厅科研基金资助项目(No.2009JM1012)

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Study on the Dielectric Properties of (1-x)BiFeO3-xCoFe2O4 Composite Ceramics
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    摘要:

    采用传统的固相烧结工艺制备3种不同摩尔比的(1-x)BiFeO3 xCoFe2O4(简称(1-x)BFO xCFO, x为摩尔分数,且x=0.1, 0.3, 0.5)复合陶瓷样品,并分析了其在室温和变温下的介电性能。研究结果表明,室温下陶瓷样品的介电常数和介电损耗均随CFO含量的增加而降低;当频率大于100 kHz时,样品的介电常数随CFO含量的增加而变化不大;当x(CFO)=0.1时,样品在高频时介电损耗变小,而当x(CFO)=0.3或0.5时,陶瓷样品的介电损耗明显大于纯BFO陶瓷的介电损耗。在高温情况下,由于CFO的添加使陶瓷样品存在更多的缺陷活化及CFO所造成的漏电流,使样品在低频时的介电常数与介电损耗都变得很大。在100 kHz频率下的交流导电率均随着温度的增加而减少;且相同温度下样品中包含的CFO含量越大其交流导电率也越大。当x(CFO)=0.3和0.5时,复合陶瓷样品的交流导电率随温度的变化规律几乎相同,且它们在相同温度下的交流导电率比纯BFO的大5~6个数量级。

    Abstract:

    Three kind of (1-x)BiFeO3xCoFe2O4((1-x)BFOxCFO) composite ceramics with different molar ratio(x=0.1,0.3,0.5) were prepared by the conventional solid state method and their dielectric properties were analyzed at room and varied temperatures.The results showed that the dielectric constant and loss of these composite ceramics were decreased with increasing the content of CFO at room temperature.The dielectric constant did not change significantly and tended to be stable with the increase of CFO content when the frequency was above 100 kHz at room temperature.The dielectric loss of (1-x)BiFeO3-xCoFe2O4 with x(CFO)=0.1 became smaller at high frequency while the dielectric loss of (1-x)BiFeO3-xCoFe2O4 with x(CFO)=0.3 or 0.5 was significantly greater than that of pure BFO ceramics.At high temperature, the dielectric constant and loss of these composite ceramics at low frequency became very large due to the addition of CFO.The ac electric conductivity decreased with the temperature increasing and became larger with the CFO content increasing at 100 kHz.The electric conductivity of (1-x)BiFeO3-xCoFe2O4 with x(CFO)=0.3 and 0.5 had similar change with the temperature and 5~6 order of magnitude more than that of the pure BFO.

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娄本浊,任亚杰,何军锋.(1-x)BiFeO3-xCoFe2O4复合陶瓷介电性能的研究[J].压电与声光,2012,34(1):129-132. LOU Benzhuo, REN Yajie, HE Junfeng. Study on the Dielectric Properties of (1-x)BiFeO3-xCoFe2O4 Composite Ceramics[J]. PIEZOELECTRICS AND ACOUSTOOPTICS

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  • 在线发布日期: 2013-04-09
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