HfTe5 crystal Description
HfTe5 crystal is a member of the layered transition metal pentatelluride material family. It crystallizes in the orthorhombic phase and crystals exhibit a perfectly layered nature. HfTe5 is at the boundary of weak & strong topological insulator (TI) and might crossover to a Dirac semimetal. It also exhibits a superconducting state under applied hydrostatic pressure. The resulting crystals have mm size single domains (world record), perfectly layered nature (ideal for exfoliation and large area monolayer production). The material exfoliates rather easily but in air, the surface transforms into TeO2 or other tellurium oxide complexes due to the high electron affinity of Hf and HfTe5 surfaces. Bulk crystals are stable in air but monolayers require handling in the glovebox or inert gas conditions. Samples are shipped under pressure sample boxes back-filled with Ar to safely ship the samples.
Samples can be easily exfoliated into HfTe5 sheets wherein each HfTe5 chain is quasi-weakly bonded to each other.
HfTe5 crystal Specifications
Sample size
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~2-4 mm
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Material properties
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Anisotropic topological insulator, semimetal, superconductor
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Crystal structure
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Orthorhombic phase
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Unit cell parameters
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a= 0.403 nm b=0.816 nm, c=1.388 nm, α=β=90°, γ=104.3°
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Production method
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Chemical vapor transport 99.9995% purity
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Characterization methods
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SIMS, XRD, EDS, Raman
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HfTe5 crystal Packaging
Our HfTe5 crystal is carefully handled during storage and transportation to preserve the quality of our product in its original condition.