The thermal stability of p-type Bi2Te3 based bulks were investigated in detail.
The p-type Bi2Te3 based bulks could maintain good thermal stability below 473 K.
The volume expansion and mass loss rate increased, and density decreased over 523 K.
The thermoelectric and mechanical properties would obviously degrade over 523 K.
For p-type Bi2Te3 based bulks, higher service temperature was, lower hardness was.