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首页> 外文OA文献 >Elaboration and characterization of barium titanate powders obtained by the mechanical activation of barium nitrate and titanate oxide, and electrical properties of the ceramics sintered by SPS
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Elaboration and characterization of barium titanate powders obtained by the mechanical activation of barium nitrate and titanate oxide, and electrical properties of the ceramics sintered by SPS

机译：机械活化硝酸钡和钛酸盐氧化物获得的钛酸钡粉末的制备与表征，以及SPS烧结陶瓷的电性能

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The current work aims to reduce the energy required to obtain a high quality barium titanate nanocrystals via solid-state reaction. In order to achieve this challenge, Ba(NO3)2 and TiO2 were mechanically activated by high-energy ball milling, and then heat treated at moderate temperature (600 oC). When stoichiometric mixture was used, the formation of BT and minor BaCO3 and TiO2 impurities was observed. The use of Ba(NO3)2 excess leads to the formation of BT and a minor BaCO3 impurity. A simple acid wash treatment was used to remove the carbonate impurity and to provide a high purity BT. The powders were characterized by XRD, BET, Raman spectroscopy, and SEM-FEG. Spark Plasma Sintering (SPS) technique was used to get the dense nanoceramics. These materials show, at room temperature and at 1 kHz, colossal permittivity (ε = 105) associated with low dielectric loss (tg δ = 0.07).
机译：当前的工作旨在降低通过固态反应获得高质量钛酸钡纳米晶体所需的能量。为了解决这一难题，通过高能球磨将Ba（NO3）2和TiO2机械活化，然后在中等温度（600 oC）下进行热处理。当使用化学计量混合物时，观察到了BT和少量BaCO3和TiO2杂质的形成。过量使用Ba（NO3）2导致形成BT和少量BaCO3杂质。简单的酸洗处理用于去除碳酸盐杂质并提供高纯度的BT。通过XRD，BET，拉曼光谱和SEM-FEG对粉末进行表征。利用火花等离子体烧结（SPS）技术获得了致密的纳米陶瓷。这些材料在室温和1 kHz下显示出介电常数低（tgδ= 0.07）的介电常数（ε= 105）。

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