Principal Hugoniots of Promethium, Terbium, Thulium, Lutetium, and Actinium in a Wide Pressure Range

Burakovsky, Leonid; Preston, Dean L.; Ramsey, Scott D.; Sjue, Sky K.; Starrett, Charles E.; Baty, Roy S.

doi:10.3390/app13179643

Cited by 2 publications

(1 citation statement)

References 40 publications

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“…They are based on our new analytic model of principal Hugoniot. A comparison of the five Hugoniots to our own independent theoretical calculations demonstrates very good agreement in every case [10].…”

Section: Introductionsupporting

confidence: 52%

Derivative Spectrophotometric Determination of Lu, Tb and Tm Using Fluorescein Dye

Abd Al Aziz

2024

Egypt. J. Chem.

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The most straightforward technique to boost selectivity is to derivatively modify the spectrum; this process can be used to eliminate spectral interference, which in turn raises the assay's selection. Digital data derivatization is a well-known technique for separating valuable signals from noisy data, and it has been observed that the first derivative increases selectivity when first, second, third, and fourth derivatives are tested, from this point the research study is considered by the utilization of first order derivative spectrophotometry for the simultaneous determination of lutetium, terbium and thallium rare earth elements without extraction or separation. The developed procedure is simple, reliable and sensitive. This method allows the determinatio n of lutetium and terbium in a sample of phosphate rock. Optimum factors affecting the formation and measuring of the complexes such as wavelength, pH, initial dye concentration, molar ratio and linear calibration graphs in the range 0.25 to 12 µg -1 for Lu and Tb was obtained whereas relative standard deviation RSD% was 1.75 and 1.58 and percentage error 1.01 % and 0.91 % respectively.

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Section: Introductionsupporting

confidence: 52%

Derivative Spectrophotometric Determination of Lu, Tb and Tm Using Fluorescein Dye

Abd Al Aziz

2024

Egypt. J. Chem.

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Palladium at high pressure and high temperature: A combined experimental and theoretical study

Baty,

Burakovsky,

Luscher

et al. 2024

Journal of Applied Physics

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Palladium is one of the most important technological materials, yet its phase diagram remains poorly understood. At ambient conditions, its solid phase is face-centered cubic (fcc). However, another solid phase of Pd, body-centered cubic (bcc), was very recently predicted in two independent theoretical studies to occur at high pressures and temperatures. In this work, we report an experimental study on the room-temperature equation of state (EOS) of Pd to a pressure of 80 GPa, as well as a theoretical study on the phase diagram of Pd including both fcc-Pd and bcc-Pd. Our theoretical approach consists in ab initio quantum molecular dynamics (QMD) simulations based on the Z methodology which combines both direct Z method for the simulation of melting curves and inverse Z method for the calculation of solid–solid phase transition boundaries. We obtain the melting curves of both fcc-Pd and bcc-Pd and an equation for the fcc–bcc solid–solid phase transition boundary as well as the thermal EOS of Pd which is in agreement with experimental data and QMD simulations. We uncover the presence of another solid phase of Pd on its phase diagram, namely, random hexagonal close-packed (rhcp), and estimate the location of the rhcp-bcc solid–solid phase transition boundary and the rhcp–fcc–bcc triple point. We also discuss the topological similarity of the phase diagrams of palladium and silver, the neighbor of Pd in the periodic table. We argue that Pd is a reliable standard for shock-compression studies and present the analytic model of its principal Hugoniot in a wide pressure range.

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Principal Hugoniots of Promethium, Terbium, Thulium, Lutetium, and Actinium in a Wide Pressure Range

Cited by 2 publications

References 40 publications

Derivative Spectrophotometric Determination of Lu, Tb and Tm Using Fluorescein Dye

Derivative Spectrophotometric Determination of Lu, Tb and Tm Using Fluorescein Dye

Palladium at high pressure and high temperature: A combined experimental and theoretical study

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