実験報告書様式（一般利用課題・成果公開利用）

MLF Experimental Report

提出日 Date of Report

課題番号 Project No.

装置責任者 Name of responsible person

2014A0164

Ishigaki, Toru

実験課題名 Title of experiment

装置名 Name of Instrument/（BL No.）

Magnetic and Crystal Structures of Honeycomb Lattice systems

iMateria (BL-20)

Li3Ni2AO6 (A=Sb, Bi)

実施日 Date of Experiment
2013/5/10-5/12

実験責任者名 Name of principal investigator
Yasui, Yukio
所属 Affiliation
Meiji University

試料、実験方法、利用の結果得られた主なデータ、考察、結論等を、記述して下さい。（適宜、図表添付のこと）
Please report your samples, experimental method and results, discussion and conclusions. Please add figures andtables for better explanation.
1. 試料 Name of sample(s) and chemical formula, or compositions including physical form.
7Li3Ni2SbO6

2. 実験方法及び結果 （実験がうまくいかなかった場合、その理由を記述してください。）
Experimental method and results.

If you failed to conduct experiment as planned, please describe reasons.

We have investigated the magnetic structure of honeycomb lattice system Li3Ni2SbO6, which has the Ni2+ ions(spin S=1). Li3Ni2SbO6 is composed of Ni2SbO6 layers and Li layers, and Ni2SbO6 layers consist of edge-sharing
NiO6 and SbO6 octahedra, which form the Ni2+ honeycomb lattice. The magnetic susceptibility and the specificheat data indicate that Li3Ni2SbO6 exhibit the antiferromagnetic transition at TN =15 K. On the other hand, theCurie Weiss temperatures Θ=2 K (ferromagnetic) has been obtained from the temperature dependence of theinverse magnetic susceptibility of Li3Ni2SbO6. These results indicate that the magnetic structure and magnetic
intractions between spins are not simple. We used 7Li isotope in the preparation of powder sample for neutronscattering to avoid the large neutron absorption of Li. We have carried out the powder neutron diffraction
measurements by using neutron diffractometer (iMateria BL20).
First, we analyzed the obtained nuclear Bragg peaks at room temperature by Rietveld refinement. As aresults of having analyzed it, we confirm that the crystal structure of Li3Ni2SbO6 is consistent with thereported crystal structure by E. A. Zvereva et al. (Dalton Trans. 41 (2012) 572).

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2. 実験方法及び結果（つづき） Experimental method and results (continued)

Next, we have analyzed the magnetic
Bragg peaks at 4K (<TN) in order to21

investigate the magnetic structure. The partof
7

theneutronpoderpatterns

 2 1of

Li3Ni2SbO6 are shown in Fig. 1. All the1+ 2 -1

observed peaks at 30 K correspond to
the nuclear Bragg reflections of7

Li3Ni2SbO6. At 4 K, in addition to theobserved peaks at 30 K, the super-lattice
peaks derived from the magnetic ordering
are observed as shown in Fig. 1. We foundthat all the observed magnetic reflections
can be assigned h±δ k l indices (δ~0.165).
In Fig. 1, the arrows indicate the d-positionof the magnetic reflections of 7Li3Ni2SbO6
with a displayed index. Figure 2 shows theFig. 1: Neutron powder diffraction patterns of Li3Ni2SbO6 taken
at T =4 K and 30 K. The arrows indicate the d-position of themagnetic reflection peaks at T=4 K. The indices of the observed
magnetic reflections of 7Li3Ni2SbO6 are found to be h± k l(δ 0.165).

temperature dependence of the Bragg peakintensity at δ 1 0 (δ~0.165) magnetic reflection. Withdecreasing T, the Bragg peak intensity rapidly increases

10at TN. These results indicates that Li3Ni2SbO6 has
incommensurate complex magnetic structure. Now, weare quantitatively analyszing the detailed magneticstructure.

TNFig. 2: Temperature dependence of the Bragg peakintensity of 7Li3Ni2SbO6 at  1 0 magneticreflection (δ 0.165).

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