Crystallographic studies of compounds from the LiH+BeH2 system

Cantrell, J. S.; Beiter, T. A.; Souers, P. C.; Barry, P.E.

doi:10.1016/s0022-5088(06)80252-3

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2004

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“…A number of attempts to index and solve the crystal structure of Li 2 BeH 4 have been undertaken in the past. They all were using either two rather poor quality X-ray powder diffraction data sets published earlier 2,3 or the theoretical calculations based on the same data. − None of the suggestions for indexing of the X-ray patterns published either by Bell et al or Ashby et al were satisfactory . These results often led to the unrealistic values of calculated density for Li 2 BeH 4 ; even a superconductivity at room temperature was proposed based on one of these values .…”

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confidence: 99%

Synthesis and Crystal Structure of Lithium Beryllium Deuteride Li₂BeD₄

et al. 2004

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Single-phase ternary deuteride Li(2)BeD(4) was synthesized by a high-pressure high-temperature technique from LiD and BeD(2). The crystal structure of Li(2)BeD(4) was solved from X-ray and neutron powder diffraction data. The compound crystallizes in the monoclinic space group P2(1)/c with lattice parameters a = 7.06228(9) A, b = 8.3378(1) A, c = 8.3465(1) A, beta =93.577(1) degrees, and Z = 8. Its structure contains isolated BeD(4) tetrahedra and Li atoms that are located in the structure interstices. Li(2)BeD(4) does not undergo any structural phase transitions at temperatures down to 8 K.

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