1 results about "Lead telluride" patented technology

A method for preparing an n-type lead telluride-based thermoelectric material with synergistically improved high-temperature stability and thermoelectric performance, using the chemical formula PbTe. 1‑x I x A composite material was prepared by introducing 0.25–0.75 wt.% micron-sized metallic Mo powder into an n-type iodine-doped PbTe matrix, followed by ball milling and spark plasma sintering (SPS). Utilizing the high melting point of Mo powder and its chemical affinity for Te, a physical barrier was constructed at the grain boundaries, forming Mo-Te bonds that effectively suppressed Te volatilization at high temperatures. Simultaneously, the matching thermal expansion coefficients of Mo and PbTe prevented the formation of microcracks during thermal cycling. Experiments showed that the sample with 0.5 wt.% Mo exhibited significantly improved thermoelectric performance retention after long-term aging at 750 K without sacrificing the room-temperature thermoelectric figure of merit. This invention features a simple and low-cost process, significantly improving the high-temperature service stability of n-type PbTe materials, and is suitable for the field of thermoelectric power generation.