Synthesis of fine-crystalline Ba0.6Sr0.4TiO3–MgO ceramics by novel hybrid processing route
Synthesis of fine-crystalline Ba0.6Sr0.4TiO3–MgO ceramics by novel hybrid processing route
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DOI：
10.1016/j.jpcs.2009.07.006
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发表时间：
2009-08
影响因子：
4
通讯作者：
Hongfang Zhang;S. Or;H. Chan
中科院分区：
文献类型：
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作者：
Hongfang Zhang;S. Or;H. Chan
我们报告使用一种新的粉末在溶胶前体混合工艺路线，合成致密，均匀，细晶Ba0.6Sr0.4TiO3-MgO（BST-MgO）陶瓷以及烧结行为，显微结构和陶瓷的介电性能的研究。将纳米BST粉体分散到BST溶胶-凝胶前驱体中，球磨混合后得到均匀分布的BST浆料。将Mg（NO3）·6 H2O溶液加入到BST浆料中，通过球磨混合得到均匀的BST-MgO浆料。将BST-MgO浆料干燥并煅烧，然后在1200-1300°C的低温下压制和烧结以形成陶瓷。该陶瓷具有非常低的介电损耗角正切低于0.005，频率高于1 kHz，温度范围为−190-80°C。随着平均晶粒尺寸的增加，介电常数和介电调谐率增加，而铁电转变展宽减小。
We report the use of a novel powder-in-sol precursor hybrid processing route to synthesize dense, homogeneous, and fine-crystalline Ba0.6Sr0.4TiO3–MgO (BST–MgO) ceramics as well as the study of the sintering behavior, microstructures, and dielectric properties of the ceramics. Nanosized BST powders are dispersed into BST sol–gel precursor and uniformly distributed BST slurry is obtained after ball-milling mixing. Mg(NO3)·6H2O solution is added to the BST slurry to give homogeneous BST–MgO slurry upon ball-milling mixing. The BST–MgO slurry is dried and calcined prior to pressing and sintering at low temperatures of 1200–1300°C to form the ceramics. The ceramics possess very low dielectric loss tangent below 0.005 for frequency above 1kHz and for temperature in the range −190–80°C. The dielectric constant and dielectric tunability increase, while the ferroelectric transition broadening decreases, with increasing average grain size.