Determination of layer stacking microstructures and intralayer transition of illite polytypes by high-resolution transmission electron microscopy (HRTEM)
Determination of layer stacking microstructures and intralayer transition of illite polytypes by high-resolution transmission electron microscopy (HRTEM)
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DOI：
10.2138/am.2007.2293
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发表时间：
2007-05
影响因子：
3.1
通讯作者：
Tao Chen;Hejing Wang
中科院分区：
文献类型：
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作者：
Tao Chen;Hejing Wang
摘要利用高分辨透射电镜对自生伊利石的显微结构进行了详细的研究。观察了入射率为[100]和[110]的1M和2M1多型伊利石的近原子图像。我们毫不含糊地确定1M伊利石在单独的颗粒和microtwinned域。新形成的2M1域被1Md或1M伊利石的前包所包围。这种共生的不同伊利石多型域的规模上的几个层表明，他们是亚稳的。横向相干的1M和2M1伊利石域沿沿着相同的取向排列，并且在结晶学上垂直于[001]* 连续。这是多型共生和过渡的新现象。在一系列连续层中交错方向的层内阶梯式变化以及由此导致的层间堆积角变化导致的多型转变被假设为“层内阶梯式转变”模型。解释了固态下伊利石多型转变的过程。
Abstract A detailed investigation of microstructures of authigenic illite has been carried out using highresolution TEM. Near-atomic images of 1M and 2M1 polytypes of illite with incidence [100] and [110] were observed. We unambiguously determine 1M illite in both individual particles and microtwinned domains. Newly formed 2M1 domains are surrounded by former packets of 1Md or 1M illite. Such intergrowth of different illite-polytypic domains on a scale of several layers suggests that they are metastable. The lateral-coherent 1M and 2M1 illite domains are aligned along the same orientation and crystallographically continuous normal to [001]*. This is a new phenomenon observed for polytypic intergrowth and transition. The intralayer-stepwise change of stagger direction in a series of successive layers and consequently the interlayer-stacking angle change resulting in polytypic transition are hypothesized as an “intralayer-stepwise transition” model. It explains the process of illite polytypic transition in the solid state.