From metastable to stable modifications-in situ Laue diffraction investigation of diffusion processes during the phase transitions of (GeTe)nSb2Te3 (6 < n < 15) crystals.
نویسندگان
چکیده
Temperature dependent phase transitions of compounds (GeTe)(n)Sb(2)Te(3) (n = 6, 12, 15) have been investigated by in situ microfocus Laue diffraction. Diffusion processes involving cation defect ordering at ~300 °C lead to different nanostructures which are correlated to changes of the thermoelectric characteristics.
منابع مشابه
Effect of Amorphous Silica Addition on Martensitic Phase Transformation of Zirconia and Investigation of its Tetragonal Structure Stability Mechanisms
This work is focused on the effect of amorphous SiO2 addition on the phase transformation and microstructural evolution of ZrO2 particles. Considering the structural similarities between the amorphous ZrO2 and its tetragonal structure, XRD results showed initial nucleation of metastable tetragonal ZrO2 from its amorphous matrix upon heat treatment. This metastable phase is unstable in pure ZrO2...
متن کاملنرم شدگی فونون‌های انرژی بالا با گذار عایق - ابررسانا در سیستم ابررسانای Ba1-xKxBiO3
Single crystals of Ba1-xKxBiO3 compound for 0 < x <0.6 from insulator to superconducting region have been grown by electrochemical method. The crystals have been characterized by powder x-ray diffraction and Laue x-ray to determine the crystal structure, formed phases and potassium concentration. Inelastic x-ray scattering spectrum of the crystals has been studied to investigate the phonon pro...
متن کاملAn in situ powder diffraction study of the structural mixed-phase of YBa2Cu3O6+x at 200 and 300C
In this study, the YBa2Cu3O6+x samples at temperatures 200 and 300°C, as the value of x ( the oxygen content in 0the basal plane) increased under nearly thermodynamical equilibrium condition, the structure changed from the well- known tetragonal (T) to a mixed-phase (T+OII) region (orthorhombicII phase is a superstructure). This mixed-phase region suggests a first order T/OII phase transition ...
متن کاملرشد تک‌بلورهای Cd0.96Zn0.04Te به روش ترابری فاز بخار
Cd0.96Zn0.04Te crystals were grown using vapor phase gas transport method (VPGT). The results show that dendritic crystals with grain size up to 3.5 mm can be grown with this technique. X-ray diffraction and Laue back-reflection patterns show that dendritic crystals are single-phase, whose single crystal grains are randomly oriented with respect to the gas-transport axis. Electrical measureme...
متن کاملرشد تک‌بلور نیمرسانای Te04/0Zn96/0Cd به دو روش بریجمن تغییریافته و ترابری فاز بخار
Single crystals of Cd.96Zn.04Te (CZT) with 14 mm in diameter were grown by seedless modified Bridgman method. Also, crystals with the same chemical composition were grown by vapor phase inert gas-transport method (VPGT), and single crystals up to 3.5 mm in diameter were obtained. Structural studies by XRD and back reflection Laue method show that the grown crystals are single phase with high pu...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
- Chemical communications
دوره 48 16 شماره
صفحات -
تاریخ انتشار 2012