铁酸铋及其复合材料的制备及性能研究
发布时间：2018-10-12 09:33
【摘要】：多铁性材料是指具有铁电性、铁磁性及铁弹性中两种或者两种以上基础铁性的材料。作为多铁性材料的典型代表,BiFe03是极少数在室温下即可表现出多铁性能的材料,潜在应用广泛,引起广大学者的关注。本文以铁酸铋及其复合材料为研究对象,对熔盐法制备铁酸铋粉体工艺、水热法合成超细钛酸锶粉体工艺及其二者复合材料的制备工艺进行了细致研究,并探讨钛酸锶含量对铁酸铋基复合材料性能的影响。论文主要内容如下： 1)绪论主要综述了多铁性材料的定义、分类及其基本性质、铁酸铋的研究现状以及选择本课题的原因,并确定研究内容。 2)以Bi2O3,Fe2O3为反应原料,采用KCl-KBr,熔盐法合成亚微米单晶BiFeO3材料。研究了熔盐种类、熔盐用量、煅烧温度及煅烧时间等对BiFeO3粉体制备的影响。结果表明：采用复合熔盐KCl-KBr,控制复合熔盐与反应原料质量比为1.0、750～800℃煅烧,可以制备出颗粒尺寸约为～0.6μm斜方六面体结构BiFeO3单晶粉体材料。基于模板形成机制,探讨了熔盐法制备BiFeO3的形成机理。 3)以K2TiO(C2O4)2·2H2O、Sr(NO3)2为反应原料,以NaOH作为矿化剂,采用水热法制备超细SrTiO3粉体材料。研究了反应原料与矿化剂摩尔比、水热反应温度及水热反应时间等对合成超细SrTiO3粉体的影响。通过XRD、SEM测试等手段综合分析表明：当采用反应原料与矿化剂的摩尔比为1：6200℃保温12h即可获得晶体生长完好、粒径分布均匀的超细SrTiO3粉体,。 4)以水热法制备的超细SrTiO3粉体、熔盐法制备的亚微米BiFeO3粉体作为反应原料,经压片、成型、烧结等工艺制备(1-x)BiFe03-xSrTi03(0.00≤x≤1.00)复合材料。研究了烧结工艺对(1-x)BiFe03-xSrTi03陶瓷材料致密度影响；探讨了SrTiO3含量对(1-x)BiFeO3-xSrTiO3物相组成、介电常数及介电损耗、铁电性能等的影响。结果表明：在制备(1-x)BiFe03-xSrTi03陶瓷材料时,最佳烧结温度随SrTiO3含量增大而升高,其最佳烧结温度区间为780-950℃；当0.00≤x≤0.30时,即随着SrTiO3含量增大,BiFeO3由具有反铁磁性能的斜方六面体正交结构(R3c)转变为顺磁立方相结构,0.35≤x≤1.00时,BiFeO3与SrTiO3两相共存。介电性能、铁电性能及铁磁性能测试表明,SrTO3有助于提高样品的介电性能、铁电性能及铁磁性能。
[Abstract]:Ferroelectric, ferromagnetic and ferroelastic materials are two or more basic iron materials. As a typical representative of multi-iron materials, BiFe03 is one of the few materials which can show the properties of multi-iron at room temperature. In this paper, the preparation of bismuth ferrate powder by molten salt, ultrafine strontium titanate powder by hydrothermal method and their composite materials were studied in detail. The effect of strontium titanate content on the properties of bismuth ferrate matrix composites was discussed. The main contents of this paper are as follows: 1) the introduction summarizes the definition, classification and basic properties of polyferric materials, the current research situation of bismuth ferrate and the reasons for choosing this topic. 2) Submicron single crystal BiFeO3 materials were synthesized by KCl-KBr, molten salt method using Bi2O3,Fe2O3 as raw material. The effects of kinds of molten salt, amount of molten salt, calcination temperature and calcination time on the preparation of BiFeO3 powder were studied. The results show that when the mass ratio of the compound molten salt to the raw material is 1.0750 鈩，
本文编号：2265635
[Abstract]:Ferroelectric, ferromagnetic and ferroelastic materials are two or more basic iron materials. As a typical representative of multi-iron materials, BiFe03 is one of the few materials which can show the properties of multi-iron at room temperature. In this paper, the preparation of bismuth ferrate powder by molten salt, ultrafine strontium titanate powder by hydrothermal method and their composite materials were studied in detail. The effect of strontium titanate content on the properties of bismuth ferrate matrix composites was discussed. The main contents of this paper are as follows: 1) the introduction summarizes the definition, classification and basic properties of polyferric materials, the current research situation of bismuth ferrate and the reasons for choosing this topic. 2) Submicron single crystal BiFeO3 materials were synthesized by KCl-KBr, molten salt method using Bi2O3,Fe2O3 as raw material. The effects of kinds of molten salt, amount of molten salt, calcination temperature and calcination time on the preparation of BiFeO3 powder were studied. The results show that when the mass ratio of the compound molten salt to the raw material is 1.0750 鈩，
本文编号：2265635
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