Tungsten exists in two crystal habitual structures: α and β. The former is stacked with cube core, which is a relatively stable composition. The latter is metastable A15 cube accumulation, but the stability caused by non-equilibrium synthesis or impurities can be compared with that under surrounding conditions α Coexist. Compared to the α phase has grains of equal length, the β phase exhibits cylindrical crystallinity. The resistivity of the α phase is only β One third of the phase and has much lower than Superconducting transfer temperature of β phase (critical point TC): ca. 0.015 K vs. 1 – 4 K; The intermediate critical temperature TC can be obtained by mixing the two. Other metals and tungsten alloys can also increase its critical temperature Tc. This kind of tungsten alloy can be used in low temperature superconducting circuits.
Wolframite (Mn,Fe)WO4 ore found in nature
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