研究目的
To examine the formation mechanism of twin structures in p-type (Bi0.25Sb0.75)2Te3 compound using high-resolution transmission electron microscopy (HR-TEM) and computer simulations.
研究成果
The formation of {001} twins in (Bi0.25Sb0.75)2Te3 structure is enabled by consecutive gliding of partial dislocations on the {0001} plane with 1/3?1010?-type vectors. The f1010g incoherent twin boundary formed on a step of the {0001} coherent twin boundary can expand or reduce the twin region through a movement along the ?1010? direction.
研究不足
The study focuses on the formation mechanism of twin structures in a specific thermoelectric compound and may not be directly applicable to other materials or conditions.
1：Experimental Design and Method Selection:
The study used HR-TEM and computer simulations to analyze twin boundary structures in (Bi
2：25Sb75)2Te3 thermoelectric compound fabricated by spark plasma sintering (SPS). Sample Selection and Data Sources:
Polycrystalline p-type (Bi
3：25Sb75)2Te3 alloy powders were fabricated by mechanical alloying from high purity elemental granules of Bi, Sb, and Te. List of Experimental Equipment and Materials:
High-energy planetary ball mill (P100), zirconia jars, 5-mm-diameter zirconia balls, spark plasma sintering (SPS) system.
4：Experimental Procedures and Operational Workflow:
Mechanical alloying was performed with a ball to powder weight ratio of 15:1 at 800 r/min for 20 min in an Ar atmosphere. The resultant products were sintered into discs by SPS under an axial pressure of 50 MPa for 10 min at 400 °C in vacuum.
5：Data Analysis Methods:
HR-TEM observations and computer simulations were used to analyze the twin boundary structures.
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