Thermal behavior of modulated haüyne from Eifel, Germany: In situ high-temperature single-crystal X-ray diffraction study

摘要

In-situ high-temperature single-crystal X-ray diffraction experiments on modulated haiiyne obtained from Eifel, Germany, were conducted to re-evaluate its thermal behavior. The linearity of its thermal expansion is lost between 600 and 700 ℃. Satellite peaks, indicating the modulated structure, were clearly observed up to 600 ℃, but disappeared at 700 ℃. These results indicate that the modulated haiiyne structure changed in this temperature region. In addition, according to the observation of X-ray oscillation images taken at ambient conditions, the modulated structure of the sample heat-treated below 1000 ℃ remained unchanged, whereas modulation of the parent crystal structure changed when the sample was heat-treated above 1000℃. This structural change to the unique modulated structure can be attributed to be the possible rearrangement of A1/Si distribution in the tetrahedral sites forming the framework.