Abstract Generated abstract
This paper reports interferometric measurements of the relative dispersion of neodymium and samarium trivalent ions with respect to lanthanum ions in aqueous chloride solutions. Using the Puccianti method with a spectrograph and Jamin interferometer, and monitoring temperature differences with a differential thermocouple, dispersion curves were obtained for solutions at 1/10 and 1/20 mol/l over the optical range. The neodymium curve in chloride solution was found to follow the same course as previously observed in sulfate solution, while the samarium curve ran nearly parallel to that of lanthanum. The results suggest that relative dispersion behavior of rare earth ions in chloride solutions may resemble that in sulfate solutions.
Full Text
UDC 546.657
PHYSICS
R. M. SHUKUROVA
DISPERSION CURVES OF Nd³⁺ AND Sm³⁺ RELATIVE TO La³⁺ IN AQUEOUS CHLORIDE SOLUTIONS
(Presented by Academician I. V. Obreimov, 20 XII 1967)
In (¹), the dispersion curves of trivalent ions of rare-earth elements (REE)—Ce, Pr, Nd, Eu, Dy, Ho, Er, Tu, Yb—were measured relative to the lanthanum ion in aqueous sulfate solutions in the wavelength interval from 2500 to 6500 Å. The measurements were carried out by the Puccianti interferometric method using an ISP-22 spectrograph and a Jamin-type interferometer with fused-quartz plates. In the present work, measurements of the dispersion of REE relative to La have been continued; neodymium and samarium chlorides were chosen as the objects of study. The preparation of the solutions and the method for measuring dispersion were the same as in (¹), but the temperature difference of the solutions in both arms of the interferometer was monitored by a differential thermocouple with an accuracy of up to 0.01°.
Figure 1 shows the dispersion curves of the Nd³⁺ and Sm³⁺ ions relative to the La³⁺ ion at solution concentrations of 1/10 and 1/20 mol/l. Two dispersion curves of Sm³⁺ (3) were obtained in measurements of one and the same solution.
Fig. 1. Dispersion curves of lanthanides relative to the dispersion curve of lanthanum.
1 and 2 — neodymium; 3 and 4 — samarium; 1 and 4 — concentration 1/10 mol/l; 2 and 3 — 1/20 mol/l.
It turned out that in chloride solutions the course of the Nd³⁺ dispersion curve is the same as in sulfate solutions. The Sm³⁺ dispersion curve runs parallel to the La³⁺ dispersion curve. It should be noted that in sulfate solutions the dispersion curves of the Eu³⁺ and Dy³⁺ ions, which follow Sm³⁺, are also almost parallel to the dispersion curve of the La³⁺ ion; therefore, it should be expected that the course of the dispersion curves of REE ions relative to the La³⁺ ion in chloride solutions is the same as in sulfate solutions.
Institute of General and Inorganic Chemistry
named after N. S. Kurnakov
Received
28 XI 1967
CITED LITERATURE
¹ R. M. Shukurova, E. F. Yampikov, Dispersion curves of REE relative to lanthanum in aqueous sulfate solutions. Deposited at VINITI, VI 1968.