研究目的
To elucidate the local structure around Bi in GeBiTe (GBT) phase-change films and the effect of an interface layer on the local structure of amorphous GBT, aiming to understand the physical mechanisms contributing to the high-speed crystallization.
研究成果
The study successfully analyzed the local structure around Bi in GBT using XAFS, revealing that Bi's nearest neighbors are Ge in both crystalline and amorphous states. The interatomic distance around Bi in amorphous GBT is larger than around Ge, suggesting a looser atomic arrangement that may facilitate faster crystallization. The interface layer does not affect the local structure around Bi but may influence the electronic properties of the recording layer.
研究不足
The study focused on the local structure around Bi and did not extensively explore the effects on Te or the electronic structure changes induced by the interface layer. The analysis was limited to the first coordination shell around Bi.
1：Experimental Design and Method Selection:
XAFS analysis was used to study the local structure around Bi in GBT. Bi LIII-edge XAFS spectra were obtained for both crystalline and amorphous states of GBT, with and without an interface layer.
2：Sample Selection and Data Sources:
Samples were actual rewritable optical recording media with a dual-layer structure. The L1 layer was chosen for direct X-ray irradiation to avoid signal attenuation through the polycarbonate substrate.
3：List of Experimental Equipment and Materials:
SPring-8 BL14B2 beamline was used for XAFS measurements. A 19-element solid-state detector (SSD) and a Ge filter were employed for fluorescence yield detection.
4：Experimental Procedures and Operational Workflow:
X-rays were incident at ~8 degrees on the sample, with a beam width of 2.0 mm. The sample-detector distance was set to 45 mm.
5：0 mm. The sample-detector distance was set to 45 mm.
Data Analysis Methods:
5. Data Analysis Methods: Data were analyzed using Athena and Artemis software for XAFS analysis, focusing on the EXAFS region to determine interatomic distances and coordination numbers.
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