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(a) The calculated enthalpies for and as a function of pressure. Inset is a SEM image of the typical shape of our synthesized single crystals; (b) The Temperature (T)-Pressure (P) phase diagram of Ca–B binary system. The solid curvature represents the Ca melting point under high pressure (Ref. 14).
(a) The EELS taken from a crystal (Inset shows its transmission electron microscope image), in which only the and edges are observed. The SAED patterns taken along the zone axes of (b) , (c) , and (d) . From these SAED patterns, the single crystal is determined to have a -type tetragonal structure with the lattice parameters estimated to be and .
The measured and calculated (solid line) powder XRD patterns of . Below the XRD patterns is the difference between the measured and calculated profiles. The vertical bars mark all possible Bragg’s reflections.
(a) The temperature-dependent resistivity of a single crystal. Inset is the temperature-dependent Hall coefficient of . These measurements were measured in a physical property measurement system (PPMS-9, QUANTUMDESIGN). (b) The band structure of is along several special points in the first Brillouin zone.
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