FTIR光谱、X射线和DTA法研究R_2O_3∶3Ga_2O_3∶4B_2O_3(R=La^(3+),Y^(3+),Yb^(3+))系的固态反应

摘要

Single crystals of huntite type double borates possess excellent physical and chemical properties and are applied in laser optics.Substituted with various rare earths and Ga 3+ ,Cr 3+ or Sc 3+ ions the properties of these borates can be improved. [1] For the first time double borates RGa 3(BO 3) 4(R=Y 3+ ,Sm 3+ ,Eu 3+ ,Gd 3+ ,Tb 3+ and Dy 3+ )were synthesised by Blasse and Bril [2] at 750℃. The goal of the present work is to study the solid state reactions in the R 2O 3∶3Ga 2O 3∶4B 2O 3(R=La 3+ ,Y 3+ ,Ho 3+ ,Yb 3+ )systems.Such reactions can lead to RGa 3(BO 3) 4 formation. Reagent grade oxide powders were used as reactants and mixed together in desired rations in acetone.Then differential thermal analysis(DTA)was used to study the formations of borates and changes in structure of mixtures heated up to 1000℃.In addition pellets were prepared by using 15mPa pressure and sintered at different temperatures from 600℃ to 1100℃ for 20 hours in order to study the reactions by IR and X ray.