摘要
使用ＸＲＤ、Ｍｏｓｓｂａｕｅｒ谱及化学组成分析考察了氧缺位铁酸盐ＭＦｅ２Ｏ４－δ（δ＞０，Ｍ＝Ｆｅ，Ｃｏ，Ｍｎ，Ｎｉ）的晶格常数、磁性、稳定性及还原性．结果表明，氧缺位铁酸盐ＭＦｅ２Ｏ４－δ（δ＞０）的晶格常数比ＭＦｅ２Ｏ４＋δ（δ≥０）的大，Ｍｏｓｓｂａｕｅｒ谱内磁场却更小．ＭＦｅ２Ｏ４－δ（δ＞０）随着氧缺位程度δ的增大，晶格常数增大，内磁场减小．ＭＦｅ２Ｏ４－δ在室温下空气中是不稳定的，只能在惰性气体中低温（＜６７３Ｋ）下稳定存在．ＭＦｅ２Ｏ４－δ具有较强的还原能力，在５７３Ｋ下能将ＣＯ２还原成Ｃ．
In the present paper, the lattice constant, magnetism, stability and reducing property of oxygen deficient ferrite MFe 2O 4- δ ( δ >0, M=Fe, Co, Mn, Ni) have been studied by XRD and Mssbauer methods. It is found that the lattice constant of MFe 2O 4- δ ( δ >0) is larger than that of MFe 2O 4+ δ , while its internal magnetic field is smaller than that of MFe 2O 4+ δ . With increasing the deficiency degree δ , the lattice constant increased, and the internal magnetic field decreased. MFe 2O 4- δ is unstable in air at room temperature, but it can exist steadily in inert gas at low temperature(<673 K), MFe 2O 4- δ possesses very strong reducing power and can reduce CO 2 to C at 573 K.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
1998年第10期1537-1541,共5页
Chemical Journal of Chinese Universities
基金
国家自然科学基金
关键词
氧缺位铁酸盐
磁性
稳定性
还原性
铁酸盐
制备
Oxygen deficient ferrite, Lattice constant, Magnetism, Stability, Reducing property
