Sintering character of nanocrystal calcium-deficient apatite
- VernacularTitle:纳米缺钙磷灰石的热处理特性
- Author:
Yantao ZHAO
;
Dagang GUO
;
Yumei ZHANG
- Publication Type:Journal Article
- Keywords:
Calcium-deficient apatite;
Heat treatment;
Morphology;
Nano-structutred materials
- From:
Journal of Practical Stomatology
1996;0(02):-
- CountryChina
- Language:Chinese
-
Abstract:
Objective:To study the sintering character of calcium-deficient apatite.Methods:Calcium-deficient apatite synthesised by wet chemical method was sintered at different temperature and then its chemical composition, phase structure and morphology were examined by FT-IR spectroscopy, X-ray diffraction (XRD) and field emission scanning microscopy (FESEM) respectively.Results:When the heating temperature is below 500 ℃, apatite crystal kept a stable size with a diameter of 12-26 nm and a length of 30-66 nm. After sintered at 600 ℃ for 2 h, apatite crystal were with a diameter of 25-40 nm and a length of 75-100 nm. Around 800 ℃ for 2 h, apatite was decomposed into Ca_3(PO_4)_2.The crystal size of the Ca_3(PO_4)_2 surpassed 200 nm in diameter and length. NH_4+ ion could be removed at temperature beyond 300 ℃.Conclusion: Calcium-deficient apatite has it's specific sintering character.
