Phase separation in solid mixtures of helium-3 and helium-4

Ehrlich, Steven N.; Simmons, R. O.

doi:10.1007/bf00682625

Cited by 64 publications

(2 citation statements)

References 14 publications

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“…[7][8][9] Schuch et al showed that the helium compressed under high pressure at about 1 K could possess bcc structure, [5] but with lattice constant of 0.411 nm. [10,11] In our experiment, helium is also bccstructured, however, the lattice constant measured from the diffraction pattern and FFT images is 0.447 nm. Although, the discrepancy between the lattice constant values is not fully understood, it could be due to: (i) Schuch's data were measured at 1.73 K, while our data were obtained at room temperature; (ii) Schuch's data were measured from compressed solid helium crystals, while our results were measured from heliumimplanted W. Nonetheless, the studies demonstrated the same bcc structure of solid helium.…”

Section: Resultsmentioning

confidence: 53%

Atomic origins of solid helium bubbles in tungsten

Xia¹,

Guo²,

Dai³

et al. 2014

Chinese Phys. B

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Solid helium bubbles were directly observed in the helium ion implanted tungsten (W), by different transmission electron microscopy (TEM) techniques at room temperature. The diameters of these solid helium bubbles range from 1 nm to 8 nm in diameter with the mean bubble size about 3 nm. The selected area electron diffraction (SAED) and fast Fourier transform (FFT) images revealed that solid helium bubbles possess body-centered cubic (bcc) structure with a lattice constant of 0.447 nm. High-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM) images further confirmed the existence of helium bubble in tungsten. The present findings provide an atomic level view of the microstructure evolution of helium in the materials, and revealed the existence of solid helium bubbles in materials.

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