Structural Transformation in GexS100−x (10 ≤ x ≤ 40) Network Glasses: Structural Varieties in Short-Range, Medium-Range, and Nanoscopic Scale

Y. Sakaguchi; T. Hanashima; K. Ohara; Al-Amin A. Simon; M. Mitkova

Structural Transformation in Ge_xS_100−x (10 ≤ x ≤ 40) Network Glasses: Structural Varieties in Short-Range, Medium-Range, and Nanoscopic Scale

Y. Sakaguchi, T. Hanashima, K. Ohara, Al-Amin A. Simon, M. Mitkova

Electrical Engineering Department

Research output: Contribution to journal › Article › peer-review

Abstract

Precise x-ray diffraction measurements using high-energy x rays of synchrotron radiation and systematic Raman scattering measurements were carried out for Ge x S 100−x (10 &les; x &les; 40) network glasses. The structural models of the network glasses were proposed based on the results. In the stoichiometric composition Ge 33 S 67 , GeS 4 tetrahedral units are connected forming either corner-sharing or edge-sharing structures. In the S-rich glasses, S atoms are inserted between two neighboring GeS 4 tetrahedra, resulting in a flexible floppy network. In a much more S-rich region, some S 8 ring molecules are isolated from the network, and assemble to form a crystal in nanoscopic scale. In this respect, Ge 10 S 90 samples are regarded as crystallized glasses. In the Ge-rich region, the GeS 4 tetrahedra are connected with bridging Ge atoms. The connection makes a new rigid network. The bridging Ge-S bond is weaker than the intratetrahedron bond, and this leads to drastic changes in the optical properties.

Original language	American English
Journal	Physical Review Materials
State	Published - 1 Mar 2019

Keywords

amorphous materials
condensed matter & materials physics
raman spectroscopy
structural properties
x-ray diffraction

EGS Disciplines

Electrical and Computer Engineering

Access to Document

Structural Transformation in Ge sub em x em sub S sub 100 x Final published version, 1.16 MBLicense: Unspecified

Cite this

@article{37b03eb8ed434d4ca6bcfbb7856e0c11,

title = "Structural Transformation in GexS100−x (10 ≤ x ≤ 40) Network Glasses: Structural Varieties in Short-Range, Medium-Range, and Nanoscopic Scale",

abstract = " Precise x-ray diffraction measurements using high-energy x rays of synchrotron radiation and systematic Raman scattering measurements were carried out for Ge x S 100−x (10 &les; x &les; 40) network glasses. The structural models of the network glasses were proposed based on the results. In the stoichiometric composition Ge 33 S 67 , GeS 4 tetrahedral units are connected forming either corner-sharing or edge-sharing structures. In the S-rich glasses, S atoms are inserted between two neighboring GeS 4 tetrahedra, resulting in a flexible floppy network. In a much more S-rich region, some S 8 ring molecules are isolated from the network, and assemble to form a crystal in nanoscopic scale. In this respect, Ge 10 S 90 samples are regarded as crystallized glasses. In the Ge-rich region, the GeS 4 tetrahedra are connected with bridging Ge atoms. The connection makes a new rigid network. The bridging Ge-S bond is weaker than the intratetrahedron bond, and this leads to drastic changes in the optical properties.",

keywords = "amorphous materials, condensed matter & materials physics, raman spectroscopy, structural properties, x-ray diffraction",

author = "Y. Sakaguchi and T. Hanashima and K. Ohara and Simon, {Al-Amin A.} and M. Mitkova",

year = "2019",

month = mar,

day = "1",

language = "American English",

}

TY - JOUR

T1 - Structural Transformation in GexS100−x (10 ≤ x ≤ 40) Network Glasses: Structural Varieties in Short-Range, Medium-Range, and Nanoscopic Scale

AU - Sakaguchi, Y.

AU - Hanashima, T.

AU - Ohara, K.

AU - Simon, Al-Amin A.

AU - Mitkova, M.

PY - 2019/3/1

Y1 - 2019/3/1

N2 - Precise x-ray diffraction measurements using high-energy x rays of synchrotron radiation and systematic Raman scattering measurements were carried out for Ge x S 100−x (10 &les; x &les; 40) network glasses. The structural models of the network glasses were proposed based on the results. In the stoichiometric composition Ge 33 S 67 , GeS 4 tetrahedral units are connected forming either corner-sharing or edge-sharing structures. In the S-rich glasses, S atoms are inserted between two neighboring GeS 4 tetrahedra, resulting in a flexible floppy network. In a much more S-rich region, some S 8 ring molecules are isolated from the network, and assemble to form a crystal in nanoscopic scale. In this respect, Ge 10 S 90 samples are regarded as crystallized glasses. In the Ge-rich region, the GeS 4 tetrahedra are connected with bridging Ge atoms. The connection makes a new rigid network. The bridging Ge-S bond is weaker than the intratetrahedron bond, and this leads to drastic changes in the optical properties.

AB - Precise x-ray diffraction measurements using high-energy x rays of synchrotron radiation and systematic Raman scattering measurements were carried out for Ge x S 100−x (10 &les; x &les; 40) network glasses. The structural models of the network glasses were proposed based on the results. In the stoichiometric composition Ge 33 S 67 , GeS 4 tetrahedral units are connected forming either corner-sharing or edge-sharing structures. In the S-rich glasses, S atoms are inserted between two neighboring GeS 4 tetrahedra, resulting in a flexible floppy network. In a much more S-rich region, some S 8 ring molecules are isolated from the network, and assemble to form a crystal in nanoscopic scale. In this respect, Ge 10 S 90 samples are regarded as crystallized glasses. In the Ge-rich region, the GeS 4 tetrahedra are connected with bridging Ge atoms. The connection makes a new rigid network. The bridging Ge-S bond is weaker than the intratetrahedron bond, and this leads to drastic changes in the optical properties.

KW - amorphous materials

KW - condensed matter & materials physics

KW - raman spectroscopy

KW - structural properties

KW - x-ray diffraction

UR - https://scholarworks.boisestate.edu/electrical_facpubs/410

M3 - Article

JO - Physical Review Materials

JF - Physical Review Materials

ER -