The invention provides rare earth compounds of formula [(ML.sub.3).sub.x A].sub.y where M is one or more of the rare earth metals and yttrium, L is a beta-diketone type ligand, A is a polyether or polyamine, and x and y are each 1 or 2. These compounds are precursors for chemical vapor deposition (CVD) of oxide layers in applications such as superconductors, piezoelectrics, microwaves, fuel cells, radiation detectors, optoelectronics, and catalysts. They are air and moisture stable, low melting,...

A rare earth semiconductor laser is disclosed comprising a semiconductor erial of the type Ln.sub.2 TX.sub.5 where Ln is a rare earth element, T is zirconium or hafnium, and X is sulfur or selenium. The semiconductor contains neodymium as a dopant rare earth ion and can be made to lase by applying an electric voltage.

Rare earth compositions comprising nanoparticles, methods of making nanoparticles, and methods of using nanoparticles are described. The compositions of the nanomaterials discussed may include scandium (Sc), yttrium (Y), lanthanum (La), cerium (Ce), praseodymium (Pr), neodymium (Nd), promethium (Pm), samarium (Sm), europium (Eu), gadolinium (Gd), terbium (Tb), dysprosium (Dy), holmium (Ho), erbium (Er), thulium (Tm), ytterbium (Yb), and lutetium (Lu). The nanoparticles can be used to make organo...

Rare earth compositions comprising nanoparticles are described along with various nanotechnology applications of such nanoparticles. The compositions of the nanomaterials discussed may include scandium (Sc), yttrium (Y), lanthanum (La), cerium (Ce), praseodymium (Pr), neodymium (Nd), promethium (Pm), samarium (Sm), europium (Eu), gadolinium (Gd), terbium (Tb), dysprosium (Dy), holmium (Ho), erbium (Er), thulium (Tm), ytterbium (Yb), and lutetium (Lu).

A rare earth permanent magnet is in the form of a sintered magnet body having a composition R.sup.1.sub.aR.sup.2.sub.bT.sub.cA.sub.dF.sub.eO.sub.fM.sub.g wherein F and R.sup.2 are distributed such that their concentration increases on the average from the center toward the surface of the magnet body, the concentration of R.sup.2/(R.sup.1+R.sup.2) contained in grain boundaries surrounding primary phase grains of (R.sup.1,R.sup.2).sub.2T.sub.14A tetragonal system within the sintered magnet body is...

A rare earth permanent magnet is in the form of a sintered magnet body having a composition R.sup.1.sub.aR.sup.2.sub.bT.sub.cA.sub.dF.sub.eO.sub.fM.sub.g wherein F and R.sup.2 are distributed such that their concentration increases on the average from the center toward the surface of the magnet body, and grain boundaries having a concentration of R.sup.2/(R.sup.1+R.sup.2) which is on the average higher than the concentration of R.sup.2/(R.sup.1+R.sup.2) contained in primary phase grains of (R.su...

High frequency dielectric ceramic compositions having a dielectric constant (.di-elect cons..sub.r) of 30 to 50, a Q value of 15,000 or more at 1 GHz, and a temperature-dependent factor of resonant frequency (.tau.f) which can be arbitrarily controlled centering around 0 (ppm/.degree. C.) have a main crystal of the perovskite type crystal phase by (1-x)MeTi.sub.a O.sub.1+2a --xLn(Ma.sub.1/2 Mb.sub.1/2).sub.b O.sub.(3+3b)/2, wherein Ln is a rare earth element, Ma is at least one of Mg and Zn, Mb ...

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.

New complex metal silicate hydrocarbon conversion catalysts, especially chrysotiles, are provided. In one embodiment synthetic chrysotiles of Mg, Co or Ni are provided wherein 0-30% of the Mg, Co or Ni has been replaced in the synthesis mix by V, Cr, Mo, W, Mn, Re, Cu, Al, Zn or Group VIII metals, and an additional 1-20% of the Mg, Co or Ni has been replaced in the synthesis mix by rare earths, La being the most preferred. Such chrysotiles have improved stability and catalytic activity for hydro...

A rare-gas-discharge lamp, wherein the electrodes pass, at least over a portion of their length, within refractory and dielectric screens having at least an opening which allows the discharge propagation and has linear size much smaller than the screened length of each electrode so that, when the discharge occurs, a nearly punctate light source is obtained.