Preparation and characterization of NaSm_9(SiO_4)6O_2 powders with infrared absorptive properties

摘要

NaSm_9(SiO_4)6O_2 powders were synthesized by mild hydrothermal method at 180 °C for 24 h. The infrared optical properties and structure of the obtained powders were characterized. There existed two narrow and sharp absorptive bands near 943 cm"1 (10.6 um). The band at 938 cm"1 was assigned to the stretching vibrations of Si-O-Sm groups connecting to Q1 species and the band at 989 cm"1 was attributed to the stretching vibrations of Si - 0- Sm groups linking with Q° species. The reflectivity was lower than 1% from 900 to 1200 nm and reached the minimum of 0.46% at 1073 nm.The prepared powders exhibit potential to act as a new kind of absorptive material for the infrared light of 10.6 fun and 1.06 um.