BaO-PbO-Nd2O3-Bi2O3-TiO2系物相组成与介电性能关系的研究

以五元系统BaO-PbO-Nd2O3-Bi2O3-TiO2为研究对象探讨化合物相与介电性能的定量关系.系统的主次晶相分别为BaNd2Ti5O14和Bi4Ti3O12.对系统进行X射线分析,用X射线衍射峰强度计算出系统中各物相的体积分数,再运用李赫德涅凯对数混合定则进行定量计算,得出的系统的介电性能与用仪器实测的系统参数相符.在本研究系统中,X衍射射线分析可以测定和定量表征烧结介质瓷中化合物含量,经过对系统中各化合物成分的介电性能测定,可计算出所研究系统的介电性能,从而可以作为一种介质的设计方法.本系统主要是BaO-PbO-Nd2O3-Bi2O3-TiO2系.Nd和Bi对Ba的取代是异价取代,故能准确定量测出和算出其化合物的含量.Pb和Ba是等价取代,其化合物的含量可用X射线衍射等方法测出,在本系统中因其加入量小,对结果影响小.

Study on Relationship between Phase Composition and Dielectric Properties of BaO-PbO-Nd2O3-Bi2O3-TiO2 System

In the paper,dielectric properties and XRD pattern of the BaO-PbO-Nd 2O 3-Bi 2O 3-TiO 2 system were studied. It proposed that the main phase of the system is BaNd 2Ti 5O 14and the minor phase is Bi 4Ti 3O 12 phase.The content of each phase in the system can be obtained by using diffraction peak intensity in XRD and the Lichnetecker law .The method of XRD analysis can measure and quantitatively characterize the content of each compound and dielectric properties of the system.Therefore,it is a way of designing materials.The system comprises BaO-PbO-Nd 2O 3-Bi 2O 3-TiO 2.Ba is substituted by Nd and Bi with nonegui-valence so as to quantitatively measure and accurately calculate the content of the compound.Ba is substituted by Pb with equi-valence,of which the content can be measured by X-ray diffraction.Because of the small additive amount,it have a little effect on the system.