Preparation And Characterization Of Molybdate

Preparation and characterization of negative thermal expansion material Y2Mo3O12, luminescent materials SrMoO4:Eu3+ and Y2Mo3O12:Eu3+ was studied in this paper by high temperature-energy ball milling and the chemical precipitation method. The appearance, structure resistance and component of powder were studied by XRD, TG-DTA, SEM. The luminescent phenomena in materials doped with rare earth ions was studied by Spectrophotometer.In the experiment of preparating negative thermal expansion material Y2Mo3O12, the influences of pH, calcinations temperature, and proportion of reactants were studied. The method of high temperature-energy ball milling and the chemical precipitation method were compared. Analyzing the influence of those crafts condition upon the powder body function, to get the best preparation technology parameter and results are pH=7, Y3+:Mo6+=5:7, and the calcinations temperature of powder body was maked at 1100℃. The calcinations temperature of powder body was maked at 600℃with the chemical precipitation method. Comparing to the chemical precipitation method, calcinations temperature of powder decreased 500℃.The red phosphors SrMoO4:Eu3+ and Y2Mo3O12:Eu3+ have been fabricated by high temperature-energy ball milling and the chemical precipitation method in air and their luminescent properties have been investigated. Their excitations take on a double peak structure which locates at ultraviolet (394 nm) and visible blue light (464 nm). The emission is a line spectrum and the main peak located at 616 nm which is a well red light according to the ultraviolet and blue chip. The range of energy transition is from 5D0 to 7F2. The reasonable calcinations temperature of SrMoO4:5% Eu3+ was maked at 800℃by the chemical precipitation method and at 700℃by high temperature-energy ball mill. The reasonable calcinations temperature of Y2Mo3O12:5% Eu3+ was maked at 900℃by the chemical precipitation method and at 600℃by high temperature-energy ball mill. The concentration of Eu3+ doped as activator is 12% in SrMoO4:Eu3+. The concentration of Eu3+ doped as activator is 20% in Y2Mo3O12:Eu3+.Comparing to the chemical precipitation method, calcinations temperature of powder is lower with high temperature-energy ball milling, and the powder prepared is pure, the size is even and has good dispersion propertity. Luminecence performance of the powder is better.