paper

Controlling the stoichiometry of the triangular lattice antiferromagnet Li $_{1 + x}$ Zn $_{2 - y}$ Mo $_{3}$ O $_{8}$

arXiv:1901.02171 · doi:10.1016/j.jssc.2018.12.064

Abstract

The control of the stoichiometry of Li $_{1 + x}$ Zn $_{2 - y}$ Mo $_{3}$ O $_{8}$ was achieved by the solid-state-reaction. We found that the best sample that has the chemical composition Li $_{0.95 (4)}$ Zn $_{1.92 (8)}$ Mo $_{3}$ O $_{8}$ was obtained from the starting nominal composition with Li : Zn : Mo : O = $(1 + w)$ : $(2.8 - w)$ : $3$ : $8.6$ with $w = - 0.1$ , indicating that the stoichiometry is greatly improved compared to those in the earlier reports. For larger $w$ detailed structural analysis indicates that the mixed sites of Li and Zn are preferentially occupied by Li atoms, as well as the fraction of the non-magnetic secondary phase Zn $_{2}$ Mo $_{3}$ O $_{8}$ decreases. Magnetic susceptibility of the improved stoichiometry powder samples shows a broad hump in the temperature range of 100 $< T <$ 200 K. This suggests that the development of antiferromagnetic correlations at the high temperatures is inherent to the ideal stoichiometric LiZn $_{2}$ Mo $_{3}$ O $_{8}$ .

7 pages, 6 figures, 2 tables

Controlling the stoichiometry of the triangular lattice antiferromagnet Li1+x​Zn2−y​Mo3​O8​

Abstract

Controlling the stoichiometry of the triangular lattice antiferromagnet Li $_{1 + x}$ Zn $_{2 - y}$ Mo $_{3}$ O $_{8}$