Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:


Draw out of the predicted interatomic force


Grant-in-Aid for Scientific Research, the Ministry of Education, Culture, Sports, Science and Technology, Japan.

Liquid Bi shows a peculiar dispersion of the acoustic mode, which is related to the Peierls distortion in the crystalline state. These results will provide valuable inspiration to researchers developing new materials in the nanotechnology field.

This is a schematic picture using simple cubic lattice, where bold and broken lines denote short strong bonds and long weak ones, respectively.

Credit: M. Inui, Graduate School of Integrated Arts and Sciences, Hiroshima University, et al.

Studies of the atomic dynamics in liquid Bi have been revisited more recently. The previous inelastic neutron scattering (INS) results for liquid Bi showed inconsistency for the inelastic excitation of the acoustic mode. These results were also different from the ab initio molecular dynamics (AIMD) prediction that indicated that the peculiar atomic dynamics arose from an anisotropic interatomic force in this monatomic liquid [1].

Therefore, it is important to observe the inelastic excitation of the acoustic mode in liquid Bi using inelastic x-ray scattering (IXS).

Professor M. Inui at Hiroshima University and his collaborators at Kumamoto University, Keio University, SPring-8/JASRI, and the RIKEN SPring-8 Center measured the IXS on liquid Bi at SPring-8 [2]. This research group found that the dispersion curve of the excitation energy of the acoustic mode exhibits a flat region as a function of the momentum transfer.

The experiments conducted by Professor Inui et al. used a single-crystal sapphire cell of the Tamura type that was carefully machined to provide a 0.04-mm sample thickness.

It is said that only his research group can make full use of this "world-famous" cell, which was used to stably conduct an x-ray beam experiment under high temperatures.

Furthermore, this research group reported that the IXS experimental results for liquid Bi clearly show a distinct inelastic excitation of the acoustic mode. This resolves the previous disagreement in the literature. Those researchers said, "Consistent with ab initio calculations of liquid Bi[1], the dispersion curve was nearly flat from 7 to 15 nm [to the negative 1 power]."

They also mentioned, "A long-range force is needed to reproduce the flatness of the dispersion curve, and the long-range force has to strongly be related to a local structure consisting of shorter and longer bounds in the liquid."

This research group demonstrated a possible mechanism for the unusual dispersion of liquid Bi. Their results will greatly contribute to the development of nanotechnology.



[1] J. Souto et al., Phys. Rev. B 81, 134201 (2010)

[2] A.Q.R Baron et al., J. Phys. Chem. Solids, 61, 461 (2000).

Article information


Physical Review B


Anomalous dispersion of the acoustic mode in liquid Bi


M. Inui, Y. Kajihara, S. Munejiri, S. Hosokawa, A. Chiba, K. Ohara, S. Tsutsui, and A. Q. R. Baron


Norifumi Miyokawa | EurekAlert!

More articles from Physics and Astronomy:

nachricht Physicists made crystal lattice from polaritons
20.03.2018 | ITMO University

nachricht Mars' oceans formed early, possibly aided by massive volcanic eruptions
20.03.2018 | University of California - Berkeley

All articles from Physics and Astronomy >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Mars' oceans formed early, possibly aided by massive volcanic eruptions

Oceans formed before Tharsis and evolved together, shaping climate history of Mars

A new scenario seeking to explain how Mars' putative oceans came and went over the last 4 billion years implies that the oceans formed several hundred million...

Im Focus: Tiny implants for cells are functional in vivo

For the first time, an interdisciplinary team from the University of Basel has succeeded in integrating artificial organelles into the cells of live zebrafish embryos. This innovative approach using artificial organelles as cellular implants offers new potential in treating a range of diseases, as the authors report in an article published in Nature Communications.

In the cells of higher organisms, organelles such as the nucleus or mitochondria perform a range of complex functions necessary for life. In the networks of...

Im Focus: Locomotion control with photopigments

Researchers from Göttingen University discover additional function of opsins

Animal photoreceptors capture light with photopigments. Researchers from the University of Göttingen have now discovered that these photopigments fulfill an...

Im Focus: Surveying the Arctic: Tracking down carbon particles

Researchers embark on aerial campaign over Northeast Greenland

On 15 March, the AWI research aeroplane Polar 5 will depart for Greenland. Concentrating on the furthest northeast region of the island, an international team...

Im Focus: Unique Insights into the Antarctic Ice Shelf System

Data collected on ocean-ice interactions in the little-researched regions of the far south

The world’s second-largest ice shelf was the destination for a Polarstern expedition that ended in Punta Arenas, Chile on 14th March 2018. Oceanographers from...

All Focus news of the innovation-report >>>



Industry & Economy
Event News

Virtual reality conference comes to Reutlingen

19.03.2018 | Event News

Ultrafast Wireless and Chip Design at the DATE Conference in Dresden

16.03.2018 | Event News

International Tinnitus Conference of the Tinnitus Research Initiative in Regensburg

13.03.2018 | Event News

Latest News

Physicists made crystal lattice from polaritons

20.03.2018 | Physics and Astronomy

Mars' oceans formed early, possibly aided by massive volcanic eruptions

20.03.2018 | Physics and Astronomy

Thawing permafrost produces more methane than expected

20.03.2018 | Earth Sciences

Science & Research
Overview of more VideoLinks >>>