【作者】 刘鹏；

【导师】 朱满康；

【作者基本信息】 北京工业大学 ， 材料学， 2003， 硕士

【摘要】 本文系统研究了BaO-TiO₂-SiO₂体系中BaTiSi₂O₇相，分别制备了BaTiSi₂O₇陶瓷和Ba₂TiSi₂O₈极性玻璃陶瓷，并分析了BaTiSi₂O₇的结构与性能以及掺杂不同氧化物对Ba₂TiSi₂O₈极性玻璃陶瓷性能的影响。采用传统氧化物混合法制备了BaTiSi₂O₇陶瓷，通过调节烧结温度，组成，利用DSC、IR、XRD、Raman、SEM等测试手段，确定了BaTiSi₂O₇陶瓷的烧结工艺制度。实验结果表明，制备BaTiSi₂O₇陶瓷需要在900℃和1000℃两次预烧， 首先生成中间相－Ba2TiSi₂O₈相，然后在1145℃烧结生产高纯BaTiSi₂O₇相。此外，BaTiSi₂O₇陶瓷对组成变化极为敏感，BaTiO₃和SiO₂比值低于1:2时，主晶相为Ba₂TiSi₂O₈相，还含有BaTiSi₂O₇相；高于1:2时，则主晶相转变为BaTiSi₂O₇相。因此，BaTiO₃和SiO₂的比例应当严格控制在1:2。通过对DSC曲线积分处理，计算出BaTiO₃和SiO2生成BaTiSi₂O₇相的活化能约为366KJ/mol。通过IR、XRD、Raman等测试手段分析了BaTiSi₂O₇陶瓷结构，实验表明样品中含有TiO₅四方单锥结构和独立的硅氧环状结构。BaTiSi₂O₇陶瓷的介电常数在0.1K～1GHz频率范围内为10～8，介电损耗在10－4左右。通过XRD、SEM、压电常数d33等分析了掺杂氧化物CaO和ZrO₂对Ba2TiSi₂O₈极性玻璃陶瓷性能的影响，并得出以下结论：加入氧化钙和氧化锆不会改变主晶相，但加入氧化锆将使玻璃陶瓷中出现BaZrSi₃O₉第二相；此外，加入氧化钙有利于BTS晶体的定向析出，使d33增加，相反，加入氧化锆则不利于BTS晶体的定向析出，使d33减小。更多还原

【Abstract】 The paper studies the phase of BaTiSi₂O₇ in the system of BaO-TiO₂-SiO₂, and prepares BaTiSi₂O₇ ceramic and polar Ba2TiSi2O8 glass ceramic，analyses the structure and properties of BaTiSi₂O₇，investigates the crystalline of the polar Ba₂TiSi₂O₈ glass ceramic with additive oxide.The paper prepares ceramic of BaTiSi₂O₇ by the method of traditional oxide mixture, gives the sintering technology of BaTiSi2O7 ceramic with the method of DSC, IR, XRD, Raman, SEM by controlling tempt rue and composition. It is concluded that it is necessary calcining at 900℃ and 1000℃ to prepare BaTiSi₂O₇ ceramic. BaTiSi₂O₇ ceramic is sensitive to variety of composition, when the proportion of BaTiO3 and SiO2 is under 1:2, the main phase is Ba2TiSi2O8, and there id BaTiSi2O7 also；When it is above1:2, the main phase is BaTiSi2O7; so the proportion of BaTiO3 and SiO2 must be strictly controlled at 1:2. Additionally, we calculate the activation energy of BaTiSi2O7 phase synthesized by BaTiO3 and SiO2 by integrating the curve of DSC, and the activation energy is about 366KJ/mol. We analyze the structure of BaTiSi2O7 ceramic by methods of IR、XRD、Raman etc, the results indicate that there is structure of TiO5 pyramids and independent ring of silica oxide. The dielectric constant of BaTiSi₂O₇ is 10～8 in the frequency of 0.1K～1GHz, and the dielectric loss is about 10－4. We analyze the properties of polar Ba₂TiSi₂O₈ glass ceramic with additive CaO and ZrO₂ by XRD, SEM, d33 etc. And we conclude that: Additive CaO and ZrO2 can not influence the main phase, but the phase of BaZrSi₃O₉ occur; moreover, it is advantage to oriental crystallize BTS with CaO and disadvantage to crystallize BST<WP=5>with ZrO2.更多还原