2009/01/06 by G. J. Shu, F. -T. Huang, Shu, G. J. +11
Chemistry · Earth and Planetary Sciences · Materials Science · Physics and Astronomy · #FOS: Physical sciences #Materials Science (cond-mat.mtrl-sci) #Pigment Synthesis and Properties #Strongly Correlated Electrons (cond-mat.str-el) #Transition Metal Oxide Nanomaterials #cond-mat.mtrl-sci #cond-mat.str-el #nanoparticles nucleation surface interactions
paper · pdf · doi:10.48550/arxiv.0901.0622
6 pages, 6 figures, to be published in PRB
openalex publication_date 2009/01/06 · arxiv created 2009/07/13 · arxiv updated 2009/12/01 · openalex created_date 2024/04/11 · openalex updated_date 2026/07/28
Phase diagram of NaxCoO2 (x \gtrsim 0.71) has been reinvestigated using electrochemically fine tuned single crystals. Both phase separation and staging phenomena as a result of sodium multi-vacancy cluster ordering have been found. Phase separation phenomenon is observed in the narrow ranges of 0.76 \lesssim x \lesssim 0.82 and 0.83 \lesssim x \lesssim 0.86. While x = 0.820 shows A-type antiferromagnetic (A-AF) ordering below 22K, x = 0.833 is confirmed to have a magnetic ground state of A-AF ordering below ∼8K and is only reachable through slow cooling. In addition, x = 0.859 is found to be responsible for the highest A-AF transition temperature at about 29K. Staging model based on ordered stacking of multi-vacancy layers is proposed to explain the hysteretic behavior and A-AF correlation length for x ∼ 0.82-0.86.