Processing and ferroelectric behavior of textured KSr2Nb5O15 ceramics
Processing and ferroelectric behavior of textured KSr2Nb5O15 ceramics
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DOI：
10.1007/s10853-006-0854-5
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发表时间：
2006-09
影响因子：
4.5
通讯作者：
C. Duran
中科院分区：
文献类型：
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作者：
C. Duran
<001>采用反应模板晶粒生长法（TGG），以KSrNb 2 O 6和KNbO 3粉末为基体，以KSr 2Nb 5 O 15（KSN）针状颗粒为晶粒生长模板，制备了KSr 2Nb 5 O 15织构陶瓷<001>。KSN相形成在1100 °C下开始并且在1300 °C下完成。随着烧结时间和温度的增加，模板颗粒以牺牲基体晶粒为代价而生长，导致织构分数f提高。在1450 °C下烧结6 h，含1.5wt%Nb_2O_5和10wt%模板剂的样品的最大分数为0.98。在[001]中，10重量%的模板含量导致具有窄分布的细长晶粒的高质量织构。高织构陶瓷（f≥ 0.9）在[001]极化方向的反射极化率为0.19 C/m2，而随机样品在非极化方向的反射极化率为0.03 C/m2和0.04 C/m2。估计的饱和极化（Psat）为0.25 C/m2，这与报道的KSN单晶值0.25 C/m2相当。这表明TGG是制备具有接近单晶铁电性能的织构陶瓷的可行方法。
<001>-textured KSr2Nb5O15(KSN) ceramics were fabricated in a matrix of SrNb2O6and KNbO3powders via reactive templated grain growth (TGG), using <001>-oriented acicular KSN particles as the template for grain growth. KSN phase formation started at 1100 °C and was complete at 1300 °C. Template particles grew at the expense of matrix grains with increasing sintering time and temperature, resulting in improved texture fraction,f. A maximum fraction of 0.98 was obtained in 1.5 wt% Nb2O5and 10 wt% template containing samples sintered at 1450 °C for 6 h. A template content of 10 wt% resulted in a high quality of texture with a narrow distribution of elongated grains in [001]. The highly textured ceramics (f≥ 0.9) had a remanent polarization of 0.19 C/m2in the polarcdirection, [001], as compared to 0.03 C/m2in the non-polaraorbdirection and 0.04 C/m2as for the random sample. The estimated saturation polarization (Psat) was 0.25 C/m2which is comparable to reported KSN single crystal value of 0.25 C/m2. This indicates that TGG is a viable method to fabricate textured ceramics having ferroelectric properties close to the single crystals.