実験報告書様式（プロジェクト利用）

Experimental Report
実験課題番号 Project No.
2014P0901

承認日 Date of Approval: 2016/1/18
承認者 Approver: Ryoichi Kajimoto
提出日 Date of Report: 2016/1/18
装置責任者 Name of Instrument scientist
Ryoichi Kajimoto

実験課題名 Title of experiment

装置名 Name of Instrument/（BL No.）

Project research on protonic, superionic and amorphous functional

4SEASONS (BL01)

materials using 4SEASONS

利用期間 Dates of experiments

実験責任者名 Name of principal investigator

2014/11/19 21：00 – 2014/11/23 11:00

Mitsutaka Nakamura

2014/12/12 11：00 – 2014/12/15 11:00

所属 Affiliation
Japan Atomic Energy Agency
１．研究成果概要（試料の名称、組成、物理的・化学的性状を明記するとともに、実験方法、利用の結果得られた主なデータ、考察、結論、図表等を記述してください。
Outline of experimental results (experimental method and results should be reported including sample
information such as composition, physical and/or chemical characteristics.
Sample Information
2014A: Ba8Ga16Sn30

single crystals

2014B: ScF3 powder
Experimental Condition
2014A: Fermi 200Hz, Ei=12.0, 20.6, 41.8, 130.0 meV (multi-Ei); RT; rotating crystal measurement
2014B: Fermi 250Hz, Ei=15.8, 25.5, 42.9, 121.1 meV (multi-Ei); 7K , 295K, 520K
Results
The main purpose of our project is to develop the G(r,E) analysis which can be transformed from the S(Q,E)
map obtained by inelastic neutron scattering (INS) measurement. So far, the G(r,E) analysis is mainly applied tothe disordered materials such as liquid and glass. Thus, it should be important to expand the applicability ofG(r,E) analysis. In this study, we obtained INS spectra of both single crystalline (2014A Ba8Ga16Sn30) andpolycrystalline (2014B ScF3 ) samples as preliminary data for G(r,E) analysis.
At first, the experimental results on single crystalline Ba8Ga16Sn30 are given in Fig.1 which shows the neutron
intensity map of transverse phonons along the [0LL] direction near (400) reciprocal lattice points. We have foundthat the data statistics and resolution in Fig.1 is too poor to obtain the correct G(r,E) data. Certainly, more
intensity and sample amounts should be needed for G(r,E) analysis of single crystalline sample.
Next, we will discuss the data of polycrystalline ScF3 which exhibits a large and isotropic negative thermal
expansion (NTE). The INS measurement of this material performed by Li[1] has received a lot of attention[2]. Liand colleagues have shown the temperature dependent peak shifts for several phonons in density of states.
However, our results were partially contradictory to their results. In particular, we found that the low-energy
peak around 5 meV shows hardening behavior with increasing temperatures as shown in Fig.2, although Li andcolleagues did not mention it.

１．研究成果概要（つづき） Outline of experimental results (continued).
These features are common in other NTE materials such as ZrW2O8 and Ag2O. In order to complete our study,
we have to be careful in several aspects. Firstly we will check the quality of ScF3 powder sample by X-rayanalysis.

Fig.1: The neutron intensity map of single crystalline
Ba8Ga16Sn30. Transverse phonon along the [0LL]
direction near (400) reciprocal lattice points is shown.

Fig.2: Temperature dependence of low-energy peak ofScF3 powder. Here LT, RT and HT mean 7K, 295K
and 520K, respectively.

[1] Chen W. Li et al., Phys. Rev. Lett. 108 (2011) 195504.
[2] J. Paul Attfield, Nature 480 (2011) 465.

必要に応じて、A4 サイズの用紙に続きを記入して下さい。
Please use A4-size papers for further reporting, if necessary.