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Theoretical Calculation and Experimental Verification for Dislocation Reduction in Germanium Epitaxial Layers with Semicylindrical Voids on Silicon
Published on: July 17, 2020
SU-75: a disordered Ge10 germanate with pcu topology
Shiliang Huang1, A Ken Inge, Sihai Yang
1Department of Materials and Environmental Chemistry and Berzelii Center EXSELENT on Porous Materials, Stockholm University, SE-10691, Stockholm, Sweden.
Dalton Transactions (Cambridge, England : 2003)
|July 11, 2012
Summary
A novel disordered germanate, SU-75, was synthesized using organic structure-directing agents. Its unique 3D framework, built from Ge(10) clusters, features multiple channel sizes and significant structural disorder.
Area of Science:
- Inorganic Chemistry
- Materials Science
- Crystallography
Background:
- Open-framework germanates are an important class of materials with diverse structures and potential applications.
- Understanding the synthesis and structural characteristics of new germanates is crucial for advancing materials science.
- The role of structure-directing agents (SDAs) in templating framework formation is a key area of research.
Purpose of the Study:
- To synthesize and characterize a new disordered open-framework germanate, SU-75.
- To elucidate the crystal structure, including framework topology and channel systems.
- To investigate the structural disorder and its origins.
Main Methods:
- Hydrothermal synthesis using diethylenetriamine (dien) or 1,4-diaminobutane (dab) as SDAs.
- Single crystal synchrotron X-ray diffraction for precise structural determination.
- Thermogravimetric analysis (TGA) and CHN elemental analysis for chemical formula confirmation.
Main Results:
- SU-75 crystallizes in the tetragonal space group I42d with cell parameters a = 18.145(3) Å and c = 41.701(9) Å.
- The 3D framework is constructed from Ge(10) clusters connected in a pcu net topology, forming channels of varying ring sizes.
- Significant framework disorder was observed, arising from alternative connectivities of the Ge(10) clusters.
Conclusions:
- The synthesis of SU-75 demonstrates the utility of dien and dab as SDAs for creating complex germanate frameworks.
- The identified structural disorder provides insights into the flexibility and formation mechanisms of germanate frameworks.
- SU-75 represents a new structural type within the family of Ge(10) germanates, offering opportunities for comparative studies.
