Neodymium selenates

The solubilities of other lanthanide selenates (penta- and octahydrates) are more in line with the result obtained by Friend, while the result by Serebrennikov et al. appears excessive. The review cannot find the reason for the discrepancy and hence no value of the solubility of Nd2(Se04)3-5H20 will be selected. [Pg.375]

Suponitskii et al. [69SUP/MAI] and Smolyakova, Efremov, and Serebrennikov [73SMO/EFR] determined the enthalpy change of the reaction between Nd2(Se04)3 5H20(cr) and a solution of barium chloride with formation of BaSe04(cr) by calorimetric measurements. The review calculated, cf. Appendix A, [Pg.375]

Since the calculation of the enthalpy of formation from the experimental results involved non-TDB auxiliary data, it is included in Appendix E. [Pg.375]

No other thermodynamic data have been found for neodymium selenates. [Pg.376]

It does not appear possible to prepare the anhydrous selenate by mere heating of the hydrates to 190X without decomposition. The best result was obtained by heating at 170 to 190°C for 14 h but the product still contained water. Friend [1]. [Pg.472]

Earlier, the pink compound was obtained by gently heating the hydrates in a current of dry air or at 170 to 180°C for a more prolonged period. However, the second specimen had been imperfectly dehydrated. Friend, Round [2]. [Pg.472]

Small amounts of added H2Se04 seem to raise the solubility, perhaps by retarding hydrolysis. A marked increase in acidity results in a fall in the solubility, see the following table (values in parentheses are interpolated) [Pg.472]

The solubilities are compared with those of La and Pr selenates. Friend [1]. [Pg.472]

A solubility of 39.68 wt% Nd2(Se04)3 at 25°C is reported by Serebrennikov et al. [3]. Hot solutions tend to become turbid due to formation of basic salts. They deposit insoluble Nd2(Se03)3 on warming [1]. [Pg.472]

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