CAJ | 학술논문

采用全氧化物为原料,利用熔盐法合成了Pb1-xLaxTiO3(0.0≤x≤0.40),当x=0.45时,烧绿石相La2Ti2O7出现.计算了合成反应活化能,并在700℃下在NaCl-KCl体系中仅用5 min就合成了Pb0.9La0.1TiO3.Pb1-xLaxTiO3陶瓷在0.00≤x＜0.25时,晶体结构为四方相,在0.25≤x≤0.40时为立方相.采用700℃ NaCl-KCl和900℃的Na2SO4-K2SO4两种熔盐体系获得了尺寸分布集中的球形颗粒,这些表明熔盐法晶体生长为扩散控制生长机理.
채용전양화물위원료,이용용염법합성료Pb1-xLaxTiO3(0.0≤x≤0.40),당x=0.45시,소록석상La2Ti2O7출현.계산료합성반응활화능,병재700℃하재NaCl-KCl체계중부용5 min취합성료Pb0.9La0.1TiO3.Pb1-xLaxTiO3도자재0.00≤x＜0.25시,정체결구위사방상,재0.25≤x≤0.40시위립방상.채용700℃ NaCl-KCl화900℃적Na2SO4-K2SO4량충용염체계획득료척촌분포집중적구형과립,저사표명용염법정체생장위확산공제생장궤리.
Perovskite-type compounds Pb1-xLaxTiO3 in the composition range of x from 0 to 0.45 were synthesized using simple oxides from 700 ℃ to 1 000 ℃ by molten salt synthesis (MSS) and a small amount of La2Ti2O7 pyrochlore phase was detected in the XRD patterns for x=0.45. The activation energy for particle growth in MSS was calculated, and the Pb0.9La0.1TiO3 was synthesized at 700 ℃ for only 5 min. The perovskite phase for the material prepared was tetragonal for 0.0≤x ≤0.25 and cubic for 0.25 ≤x≤0.40. The average particle size was different for samples prepared in NaCl-KCl and Na2SO4-K2SO4 system, but the shape was all spherical for samples obtained from both systems. The same spherical shape could be explained by the diffusion control mechanism for the particle growth into spherical shapes.