中文摘要：

以La203和Fe20，粉体为原料，在1400℃，烧结24h制备出了IaFe0，多晶料棒，采用浮区法生长出LaFeO3单晶。晶体沿（100）晶向生长，晶体的（100）晶面单晶摇摆曲线的半高宽为26”，证实其单晶化程度很高；在298～773K温度范围内测试了晶体热学性能，晶体比热变化范围为0．58～0．76J／g·K，热扩散系数变化范围为3．47～0．85mm2／s，热导率变化范围为13．10～4．21W／（m·K）；研究退火工艺对晶体近红外透过率的影响，在700℃，48h退火可以明显提高透过率达到65％。

英文摘要：

The LaFeO3 polycrystalline feed rod was prepared by sintering La203 and Fe203 powder at 1400 ℃ for 24 h. The LaFeO3 crystal grown by the floating zone method. The crystal preferred to crystallize along （100） direction. The X-ray rocking curve of the （100）crystal plane has a FWHM of 26 arcsec, confirming the high crystal quality of the sample. The thermal properties of LaFeO3 crystal during 298- 773 K was tested. The specific heat of LaFeO3 crystal variation range was 0.58-0.76 J/（ g· K）, The thermal diffusivity of LaFeO3 crystal variation range was 3.47-0.85 mm2/s , The thermal conductivity of LaFeO3 crystal variation range was 13. 10-4. 21 W/（m· K）. Discuss the influence of annealing heat treatment to infrared transmittance. The infrared transmittance reaches to about 65 % of anneal at 700 ℃ for 48 h.