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Abstract:
This work reports on the experimental investigation of wide band gap
compounds LiMgZ (Z = P, As, Sb), which are promising candidates for
opto-electronics and anode materials for lithium batteries. The
compounds crystallize in the cubic (C1(b)) MgAgAs structure (space group
F (4) over bar 3m). The polycrystalline samples are synthesized by
solid-state reaction methods. X-ray and neutron diffraction measurements
show homogeneous, single-phased samples. The electronic properties are
studied using the direct current method. Additionally, UV-Vis diffuse
reflectance spectra are recorded in order to investigate the band gap
nature. The measurements show that all compounds exhibit semiconducting
behaviour with direct band gaps of 1.0-2.3 eV depending on the Z
element. A decrease in the peak widths in the static (7)Li nuclear
magnetic resonance spectra with increasing temperature is observed,
which can be directly related to an increase in Li ion mobility.
