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Synthesis

ZB Zhonglin Bu
XZ Xinyue Zhang
BS Bing Shan
JT Jing Tang
HL Hongxia Liu
ZC Zhiwei Chen
SL Siqi Lin
WL Wen Li
YP Yanzhong Pei
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Polycrystalline GeTe, Ge1−xCu2xTe, and (Ge0.98Cu0.04Te)1−y(PbSe)y alloys were synthesized by melting, quenching, and annealing. The stoichiometric amounts of high-purity elements Ge (99.9999%), Te (99.999%), Cu (99.99%), Se (99.99%), and Pb (99.99%) were melted at 1223 K for 10 hours, followed by quenching in cold water and annealing at 850 K for 48 hours. The obtained ingots were ground into fine powder for XRD. Phase composition and microstructure are characterized by XRD (DX2000, PANalytical Aeris) and scanning electron microscope (Phenom Pro) equipped with an EDS. The dense (>95%) pellet samples with dimensions of ~12 mm in diameter and ~ 1.5 mm in thickness were obtained by hot-pressing at 823 K for 40 min under a uniaxial pressure of ~65 MPa.

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