Crystal Research and Technology · 2011 · 22 citations · 29 references
Natural SciencesMaterials EngineeringMaterials ScienceMaterials CharacterizationMaterials ChemistryNanomaterialsCrystallographyElectron DiffractionElectron MicroscopyMicrostructure AnalysisPhase ChangeTransmission Electron MicroscopyHigh-resolution Electron MicroscopyHigh-resolution Transmission Electron MicroscopyIrradiation EffectsNanoscale Materials CharacterizationPhase-change MaterialsPrecession Electron DiffractionSelected Area Electron DiffractionStructure Determination By Electron Diffraction
Abstract Precession Electron Diffraction (PED) has become a versatile tool of Transmission Electron Microscopy (TEM) for enhancing its nanoscale characterization abilities. In this contribution the advantages of PED are demonstrated on bulk samples of Phase Change Materials (PCM) with the nominal compositions Ge 8 Sb 2 Te 11 and Ge 8 Bi 2 Te 11 . PED was applied in combination with High Resolution Transmission Electron Microscopy (HRTEM) to determine such homologous structures based on variable sequences of layered building units. The efficiency of PED can be shown by the identification of ordering which is not evident from the projection of the structure in HRTEM or by use of Selected Area Electron Diffraction (SAED). Simulations support the ability of PED for recording 3D structural information. The PED patterns of the PCM can be assigned to superstructures which exhibit specific distances between adjacent Te‐Te double layers. PED was also performed to analyze the structural changes after massive irradiation of PCM crystals. (© 2011 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
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Phase-change materials for rewriteable data storage
Matthias Wuttig, Noboru Yamada · Nature Materials · 2007 · 3.6K citations