Rare earth activated rare earth fluorogermanates, represented by the formula: [R.sub.1.sbsb.x R.sub.2.sbsb.(1-x) ].sub.a F.sub.b GeO.sub.C wherein x is a value from about 0.9 to about 0.9998, a is a value of from about 2 to about 4, b is from about 0.85 to about 3.15, c is from about 4 to about 7.5 R.sub.1 is selected from the group of Y, Gd and La and R.sub.2 is selected from Eu, Gd, Tb and Pr and R.sub.1 and R.sub.2 are different, are excited by long or short wavelength ultraviolet light. A so...

A process is provided for separating, by solvent extraction, metal compounds contained in aqueous solutions. The aqueous solution is contacted with an organic phase containing at least one substituted hydroquinoline. The process of the invention is particularly applicable to the separation of at least one element selected from among the group consisting of the rare earths and yttrium from an aqueous solution containing it.

A new family of rare earth-rhodium-tin intermetallic compounds, with the representative formula (RE)Rh.sub.x Sn.sub.y, has been synthesized in single crystal form. The compounds containing the heavier rare earths are superconducting and those with the lighter rare earths are generally magnetic. The compound ErRh.sub.1.1 Sn.sub.3.6 exhibits reentrant superconductivity with T.sub.c =0.97 K and T.sub.m =0.57 K as determined from ac magnetic susceptibility measurements. The synthesis and X-ray chara...

A rare earth permanent magnet consists of 20-40 wt % of at least one rare earth element R, 0.5-4.5 wt % of boron B, 0.03-0.5 wt % of M (at least one of Al, Cu, Sn and Ga), 0.01-0.2 wt % of Bi, and the balance being at least one transition metal element T.

A process for increasing the particle size of rare earth oxides is disclosed comprising: forming an aqueous mineral acid solution containing a rare earth source dissolved therein, reacting the rare earths in said solution with oxalic acid to form an insoluble rare earth oxalate, separating the rare earth oxalate from the reaction medium, contacting the rare earth oxalate with an aqueous oxalic acid solution having a concentration of oxalic acid of from about 1 to about 40 percent by weight and h...

A stable amorphous rare earth oxide, such as Y.sub.2 O.sub.3, including a stabilizer, such as carbon, silicon carbide, or hafnium oxide. The stable amorphous rare earth oxide can be used in a dielectric layer in a magneto-optical recording medium.

A method for preparing high-density particles of rare earth carbonate comprises precipitating rare earth ions with aqueous carbonate or bicarbonate ions, in the presence of rare earth carbonate crystals, and separating the resulting precipitate. The method can be conducted to prepare individual batches or, alternatively, a continuous precipitation method can be used, wherein rare earth and carbonate or bicarbonate ions are mixed at a controlled rate to maintain an optimum pH condition. High-dens...

Rare earth glass-polishing compositions of improved homogeneity and reproducibility are prepared by (a) simultaneously continuously admixing a cerium salt solution, a basic solution and a solution of at least one acid and/or one salt, the anion or anions of which being adopted to form insoluble rare earth compounds, the number of equivalents of base being equal to or greater than the number of equivalents of cerium, and the pH of the reaction medium being greater than about 6; (b) filtering the ...

An improved scintillator for a solid state radiation detector useful in CT (computed tomography), DR (digital radiography), and related technologies. The scintillator, rather than being grown as a single crystal, is formed by means of hot pressing or sintering, as a polycrystalline ceramic. Rare earth oxides doped with rare earth activators are selected to yield a cubic crystal structure of high density and transmittance, which satisfies radiation detector requirements better than crystals utili...

A permanent magnet for an MRI scanner is made by removing extraneous elements from an ore containing rare earth elements to leave elements Pr and Nd therein, and then selectively stripping therefrom a portion of the element Nd as a byproduct to leave an ore residuum including both elements Pr and Nd therein. The residuum is alloyed with a transition metal to form an alloy therewith. The alloy is then formed into a rare earth permanent magnet configured for use in the MRI scanner.