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Ultrasonic Relaxation of Aqueous Lanthanide Nitrates at 25 °C

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Ultrasonic absorption measurements of aqueous La (NO3)3, Ce (NO3)3, Pr (NO3)3 and Yb(NO3)3 at 25 °C, in the frequency range 5 to 290 MHz are presented.

A single relaxation and its concentration dependence, in the range 0.05 to 0.20 M has been determined.

A relaxation has also been determined for 0.2 M Sm(NO3)3, Dy(NO3)3, and Er(NO3)3 in water at 25 °C. These results, combined with literature data for Nd(NO3)3 and Gd(NO3)3 are interpreted as due to the association between the lanthanide cation and NO3 −1.

The second order formation rate constants are examined in the light of the applicability of the EIGEN dissociative interchange (Id) mechanism. These constants are then compared with corresponding results for lanthanides with sulfate, oxalate anthranilate and murexide anions.

Differences between the rates for different anions of the same charge are discussed in terms of alternate dissociative (D or SN1 lim) mechanisms of solvent substitution. For chelating ligands a closing ring sterically controlled mechanism is proposed to explain the differences in rate constants. Experiments performed in the system La (NO3)3 6 H2O 0.20 M in NH4NO3 2 H2O show the appearance of a spectrum of relaxations.
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Document Type: Research Article

Publication date: September 1, 1971

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  • Acta Acustica united with Acustica, published together with the European Acoustics Association (EAA), is an international, peer-reviewed journal on acoustics. It publishes original articles on all subjects in the field of acoustics, such as general linear acoustics, nonlinear acoustics, macrosonics, flow acoustics, atmospheric sound, underwater sound, ultrasonics, physical acoustics, structural acoustics, noise control, active control, environmental noise, building acoustics, room acoustics, acoustic materials, acoustic signal processing, computational and numerical acoustics, hearing, audiology and psychoacoustics, speech, musical acoustics, electroacoustics, auditory quality of systems. It reports on original scientific research in acoustics and on engineering applications. The journal considers scientific papers, technical and applied papers, book reviews, short communications, doctoral thesis abstracts, etc. In irregular intervals also special issues and review articles are published.
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