Michiue Yuichi, Shioi Kousuke, Hirosaki Naoto, Takeda Takashi, Xie Rong-Jun, Sato Akira, Onoda Mitsuko, Matsushita Yoshitaka
National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan.
Acta Crystallogr B. 2009 Oct;65(Pt 5):567-75. doi: 10.1107/S0108768109030419. Epub 2009 Aug 28.
A new Eu-SiAlON crystal, Eu3Si(15-x)Al(1 + x)O(x)N(23-x) (x approximately 5/3), was found and the structure was determined by an X-ray diffraction technique using a twinned sample. The structure consists of a host framework, which is constructed by the connection of MX4 tetrahedra (M: Si or Al; X: O or N), and Eu ions as the guest ions. The structure is considered to be a commensurate composite crystal. The basic vectors are a1 = a/3, b and c for the first substructure, and a2 = a/5, b and c for the second substructure. The first substructure consists of part of the host framework and the Eu ions, while the remainder of the host structure is taken as the second substructure. Possible phases belonging to the series are proposed using the composite crystal model in (3 + 1)-dimensional superspace. Chemical composition, possible space groups, cell parameters, and the basic model for those phases are presented.
发现了一种新的铕-硅铝氧氮晶体Eu3Si(15 - x)Al(1 + x)O(x)N(23 - x)（x约为5/3），并使用孪晶样品通过X射线衍射技术确定了其结构。该结构由一个主体框架和作为客体离子的铕离子组成，主体框架由MX4四面体（M：Si或Al；X：O或N）连接而成。该结构被认为是一种共格复合晶体。对于第一个子结构，基本向量为a1 = a/3、b和c，对于第二个子结构，基本向量为a2 = a/5、b和c。第一个子结构由主体框架的一部分和铕离子组成，而主体结构的其余部分作为第二个子结构。利用(3 + 1)维超空间中的复合晶体模型，提出了该系列可能的相。给出了这些相的化学成分、可能的空间群、晶胞参数和基本模型。
