Morphology of Melt-Quenched Lead Telluride Single Crystals | Zendy

Hong Lian | Zendy; V. Ocelı́k | Zendy; Jacob Baas | Zendy; Graeme R. Blake | Zendy

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Morphology of Melt-Quenched Lead Telluride Single Crystals

Author(s) -

Hong Lian,

V. Ocelı́k,

Jacob Baas,

Graeme R. Blake

Publication year - 2021

Publication title -

acs applied materials and interfaces

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.535

H-Index - 228

eISSN - 1944-8252

pISSN - 1944-8244

DOI - 10.1021/acsami.0c20016

Subject(s) - materials science , lead telluride , eutectic system , thermoelectric effect , crystallite , crystallography , scanning electron microscope , electron backscatter diffraction , metastability , thermoelectric materials , telluride , single crystal , doping , optoelectronics , microstructure , composite material , metallurgy , thermal conductivity , physics , chemistry , quantum mechanics , thermodynamics

Metastable single crystals of nonstoichiometric Pb 1- x Te are obtained by rapid cooling from the melt. The composition and crystallographic morphology are studied using X-ray diffraction, scanning electron microscopy, energy-dispersive X-ray spectroscopy, and electron backscatter diffraction. Most single crystals have cubic, pyramidal, or hemispherical shapes with sizes ranging from 50 to 400 μm. All crystals adopt the same face-centered cubic rock salt structure, and the crystal growth direction is ⟨100⟩. The bulk part of the rapidly cooled material solidifies in the form of a Te-rich polycrystalline material in which grains are separated by the PbTe-Te eutectic phase. The stabilization of nonstoichiometric Pb 1- x Te provides further scope for the optimization of lead telluride-based thermoelectric materials.

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