Crystal structure of the quaternary lithogallate Sr2LiGaO4

The new quaternary lithogallate Sr2LiGaO4 was prepared by conventional solid-state synthesis in a welded tantalum ampoule at T = 850 degrees C. Single-crystal X-ray diffraction was used to elucidate the crystal structure of the compound, which crystallizes in the orthorhombic space group Pnma (no. 62) with the lattice parameters a = 11.2434(4), b = 5.6879(2), and c = 6.6983(2) & Aring;. The phase composition of the powder sample was determined by Rietveld refinement based on X-ray diffraction data. The crystal structure is composed of layers of corner-sharing LiO4 and GaO4 tetrahedra with alternating orientation parallel to the crystallographic bc plane. The eightfold coordinated strontium atoms are arranged in a zigzag manner between the layers forming two types of double-capped trigonal prismatic SrO8 units with common faces. The crystal structure of Sr2LiGaO4 is isotypic to that of the lithoaluminate derivate Sr1.85Ba0.15LiAlO4.

Automated summary

The new quaternary lithogallate Sr2LiGaO4 was synthesized using the conventional solid-state synthesis method in a welded tantalum ampoule at a temperature of 850 degrees Celsius. Its crystal structure, determined by single-crystal X-ray diffraction, belongs to the orthorhombic space group Pnma with lattice parameters a = 11.2434(4) Å, b = 5.6879(2) Å, and c = 6.6983(2) Å. Rietveld refinement based on X-ray diffraction data was used to determine the phase composition of the powdered sample. The crystal structure of Sr2LiGaO4 consists of layers of corner-sharing LiO4 and GaO4 tetrahedra with alternating orientation parallel to the crystallographic bc plane. Zigzag arrangements of eightfold coordinated strontium atoms form two types of double-capped trigonal prismatic SrO8 units with common faces, similar to the isotypic lithoaluminate derivative Sr1.85Ba0.15LiAlO4.