Synthesis and characterization of four-layered hexagonal (Sr 1-xBax)MnO3 (0.0≤x≤0.5)

Abstract

(Sr1-xBax)MnO3 (0.0≤x≤0.5) was synthesized using a standard ceramic technique which has a four-layered hexagonal (4H) structure with space group P63/mmc. The oxygen content for this is 3.000±0.001 for x= 0.0-0.3, 2.982±0.001 for x = 0.4, and 2.972±0.001 for x= 0.5. The lattice constants (a and c) increase linearly with increasing x. From Rietveld analysis at room temperature, both the Mn-O(1) distance and the Mn-O(2)-Mn angle increase with increasing x, while the Mn-O (2) distance decreases with increasing x. Based on measurements of magnetic susceptibility, 4H-(Sr1-xBax)MnO3 exhibits antiferromagnetism, and TN decreases slightly from ≈276 K (x = 0.0) to ≈264 K (x = 0.5).