Vibrational modes of sodium–tellurite glasses: Local structure and Boson peak changes

2007 ◽  
Vol 68 (5-6) ◽  
pp. 1035-1039 ◽  
Author(s):  
A.G. Kalampounias ◽  
S.N. Yannopoulos ◽  
G.N. Papatheodorou
Keyword(s):  
Local Structure ◽  
Boson Peak ◽  
Tellurite Glasses ◽  
Vibrational Modes ◽  
Sodium Tellurite

Er3+ local structure and its optical properties in ZnO–PbO tellurite glasses

2014 ◽  
Vol 383 ◽  
pp. 153-156 ◽  
Author(s):  
Raj Kumar Ramamoorthy ◽  
A.K. Bhatnagar ◽  
F. Rocca ◽  
G. Dalba ◽  
M. Mattarelli ◽  
...  
Keyword(s):  
Optical Properties ◽  
Local Structure ◽  
Tellurite Glasses

ChemInform Abstract: Structure of Sodium Tellurite Glasses: Sodium Cation Environments from Sodium-23 NMR.

ChemInform ◽  
2010 ◽  
Vol 26 (31) ◽  
pp. no-no
Author(s):  
S. L. TAGG ◽  
R. E. YOUNGMAN ◽  
J. W. ZWANZIGER
Keyword(s):  
Sodium Cation ◽  
Tellurite Glasses ◽  
Sodium Tellurite ◽  
Abstract Structure

A Low Frequency Study of the Vibrational Modes in Alkalisilicate Glasses by Raman Spectroscopy

1995 ◽  
Vol 407 ◽  
Author(s):  
R. Sommer ◽  
J. Toulouse ◽  
H. Jain
Keyword(s):  
Raman Spectroscopy ◽  
Force Constant ◽  
Density Of States ◽  
System Analysis ◽  
Low Frequency ◽  
Boson Peak ◽  
Single Parameter ◽  
Silicate Glasses ◽  
Vibrational Modes ◽  
Peak Region

ABSTRACTWe have performed a study on low frequency modes in several alkali silicate glasses by Raman spectroscopy. The Boson peak region is analyzed with a single parameter ω0 which is believed to characerize the density of states of the system. Analysis of the dependence of ω0 on the nature and concentration of the alkali suggests that the position of the Boson peak is essentially governed by the ratio “force constant” over “mass” of localized oscillator modes. At lower frequency (below 30 cm−1), the “excess” intensity can be explained by considering secondorder processes of the same vibrational modes, superimposed on other (possibly relaxational) modes.

Intermediate Range Order in Sodium Tellurite Glasses

1996 ◽  
Vol 455 ◽  
Author(s):  
J. W. Zwanziger ◽  
J. C. McLaughlin ◽  
S. L. Tagg
Keyword(s):  
Random Model ◽  
Range Order ◽  
Sodium Oxide ◽  
Oxide Content ◽  
Tellurite Glasses ◽  
Sodium Ions ◽  
Distance Distributions ◽  
Sodium Tellurite ◽  
Maximum Stability ◽  
Spin Echoes

ABSTRACTInformation about the spatial distribution of sodium cations in sodium tellurite glasses is obtained from the decay rate of sodium spin echoes. The spin echoes decay due to the magnetic dipole coupling between sodium nuclei, with each pair contributing to the rate in proportion to 1/r6, where r is the distance between the pair. The experiment is used to probe the sodium distributions in sodium tellurite glasses as a function of sodium oxide content, and the resulting distance distributions are interpreted by comparison with model distributions. At low sodium contents the distribution is similar to that of a random model in which the sodium ions are constrained to be no closer than a minimum cut-off distance. At higher contents the distributions deviate significantly from the random model, suggesting the onset of medium range order in the distribution of sodium ions. This order is most pronounced at 20% sodium oxide content, the composition at which this glass has been claimed to have maximum stability against devitrification.

scholarly journals Boson-peak-like anomaly caused by transverse phonon softening in strain glass

2020 ◽  
Author(s):  
Shuai Ren ◽  
Hongxiang Zong ◽  
Xuefei Tao ◽  
Yonghao Sun ◽  
Bao An Sun ◽  
...  
Keyword(s):  
Martensitic Transformation ◽  
Glassy State ◽  
Low Frequency ◽  
Boson Peak ◽  
Vibrational Properties ◽  
Vibrational Modes ◽  
Simulation Studies ◽  
Dynamic Relaxation ◽  
Phonon Softening ◽  
Transverse Acoustic

Abstract Strain glass is considered as a new glassy state with frozen ferroelastic/martensitic nanodomains in shape memory alloys, which exhibits many novel functionalities, yet its nature remains unclear. In this study, we reported a new dynamic relaxation behavior in strain glass that was thought to be only present in structural glasses. An abnormal hump was observed in strain glass around 10 K upon normalizing the specific heat (Cp) by cubed temperature, quite similar to the boson peak in metallic glass. The simulation studies showed that this boson-peak-like anomaly in Cp corresponds to excess low-frequency vibrational modes that stem from the transverse acoustic (TA) phonon softening of the non-transforming regions surrounding the nanodomains. The phonon softening takes place in the TA branches not associated with the martensitic transformation displacements. This work may provide a useful perspective for understanding the nature of glassy states and associated vibrational properties.

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