Electron microscopy study of the incommensurately modulated structure of ankangite
Electron microscopy study of the incommensurately modulated structure of ankangite
复制标题
铁铜矿非通约调制结构的电子显微镜研究
DOI：
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发表时间：
1990
期刊：
影响因子：
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通讯作者：
H. Hashimoto
中科院分区：
文献类型：
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作者：
X. Wu;F. H. Li;H. Hashimoto
用电子衍射和高分辨电镜研究了我国新发现的安康矿[Ba0.827（Ti5.827V2.294Cr0.053）-O 16 ]的一维非线性调制结构。其平均结构为四氢呋喃，可能的空间群为I4、I4和I4/m。电子衍射分析结果表明，由于四元沟道中大量空位的存在，使Ba离子偏离理想位置而形成调制结构。观察到通过卫星点的漫射衍射条纹，因此通过相邻Ba离子串的调制波被认为是不相干的。这是由高分辨率电子显微镜和光学衍射证实。本文报道了电子束辐照对安康石结构的影响
The one-dimensional incommensurately modulated structure of ankangite [Ba 0.827 (Ti 5.827 V 2.294 Cr 0.053 )-O 16 ], a mineral recently discovered in China, has been studied by electron diffraction and high-resolution electron microscopy. Its average structure is tetragonal and possible space groups I4, I4 and I4/m. By referring to the results of the electron diffraction analysis it is suggested that the existence of a large number of vacancies inside tetragonal channels makes the Ba ions deviate from their idealized positions to form the modulated structure. Diffuse diffraction streaks passing through satellite spots were observed and hence modulation waves through adjacent Ba-ion strings are considered to be incoherent. This was confirmed by high-resolution electron microscopy and optical diffraction. The effect of electron-beam irradiation on the structure of ankangite is reported