scholarly journals Infrared spectroscopy and hydrogen isotope geochemistry of hydrous silicate glasses. Progress report

1992 ◽  
Author(s):  
S. Epstein ◽  
E. Stolper
Keyword(s):  
Infrared Spectroscopy ◽  
Hydrogen Isotope ◽  
Isotope Geochemistry ◽  
Progress Report ◽  
Silicate Glasses ◽  
Hydrous Silicate

scholarly journals Thermal and structural characterization of the vitreous samples in the SiO2 - PbO - Na2O system

2006 ◽  
pp. 89-95 ◽  
Author(s):  
Catalina Mocioiu ◽  
Georgeta Jitianu ◽  
Maria Zaharescu
Keyword(s):  
Thermal Stability ◽  
Thermal Analysis ◽  
Differential Thermal Analysis ◽  
Infrared Spectroscopy ◽  
Silicate Glasses ◽  
Lead Silicate ◽  
High Chemical ◽  
Nuclear Techniques ◽  
Infrared Data

Lead-containing glasses have been used from the ancient time. Recently, due to the possible application in optics, electronics, nuclear techniques, wastes inactivation. the interest in these types of glasses has been renewed. For lead waste inactivation, glasses with high amount of PbO in the composition are required, those exhibiting at the same time a high chemical and thermal stability. Thermal behavior of lead-silicate glasses was examined by differential thermal analysis (DTA). Infrared spectroscopy was used to investigate the structure of the glasses. The spectra were interpreted in terms of the structures of silicate group by comparison with the spectra of other silicate crystals. The DTA and infrared data were correlated with the chemical stability tests.

Trace element partitioning between amphibole and hydrous silicate glasses at 0.6–2.6 GPa

2019 ◽  
Vol 38 (3) ◽  
pp. 414-429
Author(s):  
Bo Zhang ◽  
Xianxu Hu ◽  
Peng Li ◽  
Qizhe Tang ◽  
Wenge Zhou
Keyword(s):  
Trace Element ◽  
Silicate Glasses ◽  
Trace Element Partitioning ◽  
Hydrous Silicate ◽  
Element Partitioning

Oxygen and Hydrogen Isotope Geochemistry of the Mourne Mountains Tertiary Granites, Northern Ireland

1993 ◽  
Vol 34 (6) ◽  
pp. 1177-1202 ◽  
Author(s):  
A. G. MCCORMICK ◽  
A. E. FALLICK ◽  
R. S. HARMON ◽  
I. G. MEIGHAN ◽  
D. GIBSON
Keyword(s):  
Northern Ireland ◽  
Hydrogen Isotope ◽  
Isotope Geochemistry

scholarly journals Using Hydrogen Isotope Geochemistry to Estimate the Natal Latitudes of Immature Cooper's Hawks Migrating Through the Florida Keys

The Condor ◽  
2001 ◽  
Vol 103 (1) ◽  
pp. 11-20 ◽  
Author(s):  
Timothy D. Meehan ◽  
Casey A. Lott ◽  
Zachary D. Sharp ◽  
Ruth B. Smith ◽  
Robert N. Rosenfield ◽  
...  
Keyword(s):  
Hydrogen Isotope ◽  
Isotope Geochemistry ◽  
Florida Keys ◽  
Accipiter Cooperii ◽  
New Information ◽  
Stable Hydrogen Isotope ◽  
Males And Females ◽  
Hydrogen Isotope Ratios ◽  
The Relationship ◽  
Cooper's Hawks

Abstract We constructed a regression model for the relationship between stable-hydrogen isotope ratios in immature Cooper's Hawk (Accipiter cooperii) feathers (δDf) and precipitation in areas where feathers were grown (δDp) across much of the latitudinal and longitudinal extent of the species' breeding range. We used our model to estimate δDp values from δDf values of immature Cooper's Hawks captured during migration in the Florida Keys. We compared these estimated δDp values to a published map of δDp values of North American precipitation to learn the latitudinal origins of migrants. We reviewed previous migration banding studies to estimate the longitudinal range of migrants. Our analysis suggested that most of the immature Cooper's Hawks migrating through the Keys originated in natal areas in the Mid-Atlantic and Southeast regions of the continent. We found no difference in the passage date of northern and southern birds or in the latitudinal origins of males and females. This new information will aid in the interpretation of population trends generated from the ongoing migration count in the Keys.

A Study of Na2O-TiO2-SiO2 Glasses by Infrared Spectroscopy

1974 ◽  
Vol 28 (3) ◽  
pp. 256-259 ◽  
Author(s):  
Murli H. Manghnani ◽  
John R. Ferraro ◽  
L. J. Basile
Keyword(s):  
Infrared Spectroscopy ◽  
Absorption Band ◽  
Infrared Absorption ◽  
Vibrational Frequency ◽  
Silicate Glasses ◽  
Molar Ratio ◽  
Frequency Range ◽  
Weak Absorption ◽  
Infrared Absorption Spectra ◽  
The Relationship

The infrared absorption spectra of six Na2O-TiO2-SiO2 glasses in the frequency range of 1600 to 200 cm−1 are reported. These glasses, having a SiO2/Na2O molar ratio of 1.07 to 3.54, and containing 20 or 25 mole % TiO2, demonstrate two main absorptions at ∼950 cm−1 and at ∼450 cm−1. A weak absorption at ∼790 cm−1 becomes progressively weaker in intensity, and a weak shoulder at 1050 cm−1 appears with increasing Na2O content. The frequency of the absorption band at ∼950 cm−1 is found to decrease markedly and systematically with a decrease in the SiO2/Na2O molar ratio, whereas the frequency of the band at ∼450cm−1 shows a slight increase. The infrared results may be interpreted in terms of a lowering of symmetry occurring for the SiO4 units. The effect of TiO2 content on the relationship between vibrational frequency is discussed. The frequency composition curves for glasses containing 20 and 25 mole % of TiO2 intersect at SiO2/Na2O ratio ∼2. A reversal in the frequency vs SiO2/Na2O ratio relation was also found at SiO2/Na2O ∼2 for the sodium silicate glasses.

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