An alkoxyalcohol adduct of rare earth monocarboxylate has the formula (I): M(R.sup.2--COO).sub.3.(R.sup.1O(CH.sub.2).sub.nOH).sub.p (I) in which M is a rare earth element such as Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu; R.sup.1 is an aliphatic hydrocarbon group having 1 to 4 carbon atoms or a substituted aliphatic hydrocarbon group having 3 to 6 carbon atoms; R.sup.2 is a hydrogen atom or an aliphatic hydrocarbon group having 1 to 4 carbon atoms which has or does not have a substit...

The present invention provides surface coated phosphors useful in field emission displays and vacuum fluorescent displays. The surface coated phosphor comprises a thin coating of rare earth oxide, e.g., yttrium oxide, disposed on an uncoated phosphor such as a sulfide phosphor. The present invention further provides a process for preparing a surface coated phosphor comprising contacting the uncoated phosphor with a rare earth hydroxide gel solution to obtain a rare earth hydroxide gel coated pho...

A rare earth phosphate represented by the formula: RPO.sub.4 wherein R is a rare earth element selected from Sc, Y, and lanthanoids of atomic numbers 57 to 71, wherein Mn substitutes for 0.01-15 atom % of R emits blue light when excited by vacuum-UV radiation.

A telluride glass with glass transition temperature above 150.degree. C., fference between the crystallization temperature and the glass transition temperature of above 200.degree. C., and extended transmission in the infrared region of radiation of up to 20 microns having, on mol basis, 20-60% tellurium, 10-50% arsenic, 4-35% germanium, 0.5-15% gallium, up to 15% iodine, and up to 30% selenium. All or part of the gallium can be replaced with indium and the glass can contain up to 5%, based on t...

A lighting apparatus comprising a branch circuit wherein a light receiving cycle signal branches into a synchronizing signal and a light controlling signal, a frequency recognizing circuit which wherein a lighting frequency is calculated from the light controlling signal and a light intensity controlling signal is outputted, and an inverter circuit which receives the light intensity controlling signal and turns on a lamp based on the light intensity controlling signal.

A method of cutting a rare-earth alloy with a wire saw, obtained by fixing abrasive grains on a core wire with a resin layer, includes the step of moving the wire saw while a portion of the rare-earth alloy being machined with the wire saw is immersed in a coolant, which is mainly composed of water and has a surface tension of about 25 mN/m to about 60 mN/m at about 25.degree. C., thereby cutting the rare-earth alloy. In the wire saw, an average distance between two of the abrasive grains, which...

Luminescent chemical reagents that include complexes of rare earth metals with ligands such as aromatic heterocyclic nitrogen-containing compounds and semi-aromatic oxygen-containing compounds are used to detect small quantities of complex substances such as pharmaceuticals, metabolites, and microorganisms in complex sample mixtures.

A process for producing rare earth metals including the step of electrolyzing a starting material containing rare earth carbonates as main ingredients in a molten salt electrolytic bath containing rare earth fluorides, lithium fluoride, and barium fluoride at a bath temperature of 750 to 950.degree. C. while adjusting an anode potential to an electrolytic potential of fluorides. This method allows production of rare earth metals at a high current density and a high current efficiency, while ensu...

Rare earth metal compounds are described which, due to their luminescence when irradiated with UV light, are suitable in particular for the marking of security-relevant items, such as documents or data carriers.

When a control unit is operated by a lighting control signal, when a reference voltage source unit outputs the reference voltage, voltage inputted into an error amplifier from a time constant circuit increases gradually with passage of time so as to reach the reference voltage. The error amplifier compares the voltage, which gradually increases with a power to be impressed to a lamp. An inverter circuit controls power to be supplied to the lamp according to the error signal. Thereby, the lamp po...