以分析纯Er2O3和WO3为原料,采用固相法制备Er2W3O12陶瓷,并利用X射线衍射仪(XRD)、场发射扫描电镜(FESEM)和热重分析仪(TG)对其结构组分、断面形貌和吸湿特性进行表征.采用热膨胀仪和变温XRD对Er2W3O12陶瓷的负热膨胀特性进行表征.结果表明:在950 ℃烧结6 h制得的Er2W3O12陶瓷结构致密.Er2W3O12材料在室温下容易吸湿,在120 ℃完全失去吸湿水,表现为正交相的Er2W3O12陶瓷,具有良好的负热膨胀性能,其在138~700 ℃的平均热膨胀系数为-7.94×10-6 K-1.变温XRD分析发现:Er2W3O12陶瓷沿三个晶轴方向均表现为负热膨胀,在100~600 ℃温度区间内,Er2W3O12陶瓷的热膨胀系数为-7.81×10-6 K-1.
Negative thermal expansion Er2W3O12 ceramics were successfully prepared, using solid state reaction of Er2O3 and WO3 as raw materials.The microstructure,composition and hygroscopicity of the Er2W3O12 samples were investigated by X-ray diffraction (XRD),field emission scanning electron microscopy (FESEM) and thermogravimetric analysis (TG).The negative thermal expansion of the Er2W3O12 ceramics was studied using the thermal mechanical analysis (TMA) and high temperature X-ray diffraction (HTXRD).Results indicate that the Er2W3O12 ceramics sintered at 950 ℃ for 6 h are well crystallized.TG analysis shows that Er2W3O12 is hygroscopic.The dehydration starts at 120 ℃, and the Er2W3O12 crystals are in orthorhombic structure after dehydration.The orthorhombic Er2W3O12 ceramics show excellent negative thermal expansion.The thermal expansion coefficient of the orthorhombic Er2W3O12 ceramics is-7.94×10-6 K-1 at 138-700 ℃.HTXRD results indicate that the Er2W3O12 ceramics show negative thermal expansion along three axes, and the average thermal expansion coefficient of the orthorhombic Er2W3O12 ceramics is calculated to be-7.81×10-6 K-1 at 100-600 ℃ based on the HTXRD results.
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