摘要
用正、反向共沉淀法制备了BaHfO3∶Ce粒子;用XRD、TG-DTA、SEM等测试手段对样品的物相、形貌及发光性能进行了表征;在不同升温速率条件下研究了粒子合成动力学。结果表明:由正向和反向沉淀法得到的前驱体物相变化分3个阶段,用Doyle-Ozawa和Kissinger法分别计算了各阶段的表观活化能,其平均值分别为83.41、61.70、262.11 kJ·mol-1和81.70、42.86、253.44 kJ·mol-1,计算正反向沉淀法样品的晶粒生长活化能分别为27.36 kJ·mol-1和23.07 kJ·mol-1;反向法的样品分别在530nm波长下的激发光谱和399 nm波长的发射光谱的相对发光强度优于正向法,在2 073 K真空烧结保温3 h获得具有一定透光性的BaHfO3∶Ce透明陶瓷。
BaHfO3：Ce powders were prepared by normal strike co-precipitation（NSC） method and reverse strike coprecipitation（RSC） method respectively. The phase composition, particle morphology and luminescence properties of BaHfO3 ：Ce powders were characterized by XRD, TG-DTA and SEM. The effect of different precipitation methods on synthesis kinetics of particle was investigated at different heating rates. The results show that the precursors prepared by NSC and RSC decompose in three stages. The apparent activation energy of each stage is calculated using the Doyle-Ozawa and Kissinger methods. The average apparent activation energies of the three reaction stages of precursors prepared by NSC and RSC are 83.41, 61.70, 262.11 kJ.mol-1 and 81.70, 42.86, 253.44 kJ.mol-1 respectively. The activation energies of grain growth for BaHfO3：Ce powders prepared by NSC and RSC are 27.36 kJ .mol-1 and 23.07 kJ.mol-1 severally. The powder prepared by RSC method exhibits excellent luminescence properties with higher intensity of excitation spectrum excited by 530nm and emission spectrum excited by 399 nm. The BaHfO3：Ce ceramic is partly transparent after being sintered at 2 073 K in vacuum for 3 h.
出处
《无机化学学报》
SCIE
CAS
CSCD
北大核心
2014年第4期885-894,共10页
Chinese Journal of Inorganic Chemistry
基金
沈阳市先进陶瓷制备技术及应用重点实验室建设项目资助(No.F12-259-1-00)
