Insight Into the Defects of Cage‐Type Silica Mesoporous Crystals with Fd$bar 3$m Symmetry: TEM Observations and a New Proposal of “Polyhedron Packing” for the Crystals期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

Insight Into the Defects of Cage‐Type Silica Mesoporous Crystals with Fd$bar 3$m Symmetry: TEM Observations and a New Proposal of “Polyhedron Packing” for the Crystals

Authors:	Lu Han Yasuhiro Sakamoto Dr. Shunai Che Prof. Osamu Terasaki Prof.

Affiliation:	1. School of Chemistry and Chemical Technology, State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240 (P.R. China), Fax: (+86)?21‐5474‐1297;2. Structural Chemistry, Arrhenius Laboratory and Berzelii Center EXSELENT, Stockholm University, 10691 Stockholm (Sweden), Fax: (+46)?816‐3118

Abstract:	The many faces of crystals : Silica mesoporous crystals were synthesized by using a co‐structure directing method. Structural defects in the crystals with Fd m symmetry—described as tetrahedrally close‐packed and consisting of 5¹² and 5¹²6⁴ polyhedra—were found (see figure). These defects were explained through the use of simulated TEM images. The defect formation is also discussed.

Keywords:	crystal growth defects electron microscopy mesoporous materials template synthesis