Hydroxyapatite(HA) powders were prepared by hydrothermal treatment of CaHPO 4 ·2H 2 O with Ca(OH) 2 and characterized by XRD, FTIR, SEM, TEM. The results indicate that pH value and tem perature show great influen...Hydroxyapatite(HA) powders were prepared by hydrothermal treatment of CaHPO 4 ·2H 2 O with Ca(OH) 2 and characterized by XRD, FTIR, SEM, TEM. The results indicate that pH value and tem perature show great influences on the structure and morphology of the products. At pH=9 and 120 ℃, the HA whis- kers were obt ained with an aspect ratio>20, and typical diameter and length of 40 nm and 6 00 nm, respectively.展开更多
K0.5Bi0.5TiO3(KBT)nanocrystalline particles were hydrothermally synthesized from Bi(NO3)3·5H2O, TiO2 and KOH. The crystal phase, chemical composition and microstructure were characterized by XRD, XRF, Raman scatt...K0.5Bi0.5TiO3(KBT)nanocrystalline particles were hydrothermally synthesized from Bi(NO3)3·5H2O, TiO2 and KOH. The crystal phase, chemical composition and microstructure were characterized by XRD, XRF, Raman scattering spectroscopy and TEM. The results indicated that the products were pure perovskite structured K0.5Bi0.5TiO3 with chemical stoichiometry and perovskite structure. The TEM observation revealed that the particles possessed a feature of cubic shape and a nano-scale of about 40 nm. The KBT ceramics sintered at 1 040 ℃ from hydrothermal powders show higher density and better electric properties than that prepared by a solid-state reaction method.展开更多
文摘Hydroxyapatite(HA) powders were prepared by hydrothermal treatment of CaHPO 4 ·2H 2 O with Ca(OH) 2 and characterized by XRD, FTIR, SEM, TEM. The results indicate that pH value and tem perature show great influences on the structure and morphology of the products. At pH=9 and 120 ℃, the HA whis- kers were obt ained with an aspect ratio>20, and typical diameter and length of 40 nm and 6 00 nm, respectively.
文摘K0.5Bi0.5TiO3(KBT)nanocrystalline particles were hydrothermally synthesized from Bi(NO3)3·5H2O, TiO2 and KOH. The crystal phase, chemical composition and microstructure were characterized by XRD, XRF, Raman scattering spectroscopy and TEM. The results indicated that the products were pure perovskite structured K0.5Bi0.5TiO3 with chemical stoichiometry and perovskite structure. The TEM observation revealed that the particles possessed a feature of cubic shape and a nano-scale of about 40 nm. The KBT ceramics sintered at 1 040 ℃ from hydrothermal powders show higher density and better electric properties than that prepared by a solid-state reaction method.