利用固相反应法制备了高纯、高致密稀土硅酸盐氧基磷灰石RE_9.33(SiO_4)_6O_2(RE=La, Nd, Sm, Gd)陶瓷材料,用XRD对所合成的RE_9.33(SiO_4)_6O_2粉末和烧结得到的块体材料进行了分析表征.系统研究了RE_9.33(SiO_4)_6O_2陶瓷材料的声子速度和弹性模量,结果表明其平均声速小、弹性模型低.另外,利用Cahill模型对其热导率进行了理论计算,其极限热导率在高温下为1.18～1.22 W/m·K.从结构等各方面推断了RE_9.33(SiO_4)_6O_2陶瓷材料的低热导可能性.
High density and pure silicate oxyapatite RE_9.33(SiO_4)_6O_2 (RE=La, Nd, Sm, Gd) ceramics were synthesized by solid state reaction. The RE_9.33(SiO_4)_6O_2 powder and sintered RE_9.33(SiO_4)_6O_2 bulk were observed by XRD. The sound speed and Young's modulus were characterized. Besides, the ultimate thermal conductivity were calculated by Cahill model of 1.18～1.22 W/m.K at high temperature. We inferred the possibility of low thermal conductivity of RE_9.33(SiO_4)_6O_2 ceramics.
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