Yttrium -nitrate

In addition to meeting the foregoing requirements, a good internal standard will be easy to add uniformly and precisely, and (preferably) no appreciable amount of the element St (free or combined) will be present in the sample before the addition. Cope29 provides an excellent illustration of these points. He found that yttrium nitrate dissolved in ethyl alcohol could be added to a powdered uranium mineral in a mortar, whereupon grinding immediately to dryness dispersed the internal standard (yttrium) so uniformly that uranium could be satisfactorily determined in certain minerals. But the mineral euxenite is an exception, for it contains both yttrium and uranium, and this complicates the uranium determination with yttrium as internal standard. 

Y203 Eu nanoparticles for potential use in FEDs have been prepared in nonionic reverse microemulsions.124 The particles were synthesized by the reaction between aqueous yttrium nitrate, europium nitrate, and ammonium hydroxide, by bulk precipitation in the reverse microemulsion... 

The leach liquor is first treated with a DEHPA solution to extract the heavy lanthanides, leaving the light elements in the raffinate. The loaded reagent is then stripped first with l.Smoldm nitric acid to remove the elements from neodymium to terbium, followed by 6moldm acid to separate yttrium and remaining heavy elements. Ytterbium and lutetium are only partially removed hence, a final strip with stronger acid, as mentioned earlier, or with 10% alkali is required before organic phase recycle. The main product from this flow sheet was yttrium, and the yttrium nitrate product was further extracted with a quaternary amine to produce a 99.999% product. 

Compounds Yttrium chloride yttrium nitrate yttrium oxide yttrium phosphate... 

Yttrium oxide also may be obtained by thermal decomposition of yttrium nitrate. 

Yttrium nitrate dissolved in emulsion and evaporated in hot oil baths... 

Yttrium orthoborate nanoparticles Yi xNdxB03 have been less studied. They can be prepared by hydrothermal synthesis from boric acid, urea, yttrium nitrate, and neodymium... 

Yttria, Y203, can be prepared from a reaction of yttrium nitrate and urea (Shea et al., 1996) ... 

The use of metal nitrates provides a particularly convenient method for doping a host oxide with luminescent ions. Along with the yttrium nitrate, a luminescent rare earth ion such as Eu3+, can be added as a nitrate salt. In addition to yttria, alumina can also be prepared from aluminum nitrate and hydrazine (Ozuna et al., 2004) ... 

Inorganic precursors are much cheaper and easier to handle than metal alkoxides. Therefore the industrial production of oxide powders for ceramics and catalysts is mainly based on the precipitation or coprecipitation of inorganic salts from aqueous solutions. Gibbsite, Al(OH)3, (see Aluminum Inorganic Chemistry) is precipitated from aluminate solutions. Ti02 powders are made via the controlled hydrolysis of titanium salts. Stabilized zirconia is coprecipitated from aqueous solutions of zirconium oxychloride, ZrOC, and yttrium nitrate, YlKOsjs. 

UH609S uranyl sulfate trihydrate 20910-28-J 5 25.00 3 2800 1 1 4981 YH12N3015 yttrium nitrate hexahydrate 13494-98-J J 25.00 2.680C 1... 

In one of the only drinking water studies of the lanthanides, mice consumed yttrium nitrate at 5 ppm for 18 months. Based on this 5 ppm drinking water concentration, the calculated dose was 0.95 mg kg day . A decrease in body weight was observed in the animals over the course of the study. However, survival of the animals compared to controls was not affected following lifetime exposure. 

Properties Yellowish-white powder. D 4.84, mp 2410C. Soluble in dilute acids insoluble in water. Derivation By the ignition of yttrium nitrate. Grade Purities to 99.8%, electronic grade 99.999%. 

Preparation of Ba2YCu3p7 from the Nitrates. The nitrate samples were prepared from stoichiometric quantities of BaCOj, Y2O3 and Cu metal. The appropriate weights were put into a porcelain crucible and dissolved by the addition of concentrated nitric acid (20 ml/g Cu). The excess acid was boiled off and the product was heated at 130°C for 6 hours and then at 400°C for 3 hours in order to decompose most of the copper and yttrium nitrates. The product was then removed, ground and transferred to a platinum or stabilized zirconia crucible. The powder was heated to 800°C for 12 hours and cold-pressed into pellets at 6 Kbar. The pellets were heated to 950°C for 12 hours and then annealed in oxygen at 425°C for 6 hours. They were finally cooled to room temperature at 50°C/hr. Additional powder samples, used for TGA studies, were prepared by partial decomposition of the nitrate mixture at 400°C followed by a second heating at 900°C for 24 hours. 

An yttrium-based strong Lewis acid, prepared by treatment of aqueous solutions of yttrium nitrate and zirconyl nitrate (molar ratio 16 84) with aqueous ammonia (28%), was an active catalyst of a wide range of Diels-Alder reactions [51], Among the reactions investigated was that of acrolein with dihydropyran (Scheme 2). In contrast with reactions with H-form zeolites [11] no regio- and stereoisomers were formed. 

Nanoneedle YF3 The microwave and IL methods developed by our group have been found to be very efficient and simple, compared to other methods employed in the past for the fabrication of rare earth fluorides. To obtain yttrium fluoride nanoneedles we first had to prepare yttrium nitrate, which is obtained by refluxing yttrium oxide in a nitric acid. In the next step, the yttrium nitrate is dissolved in the IL, and then heated in a domestic microwave oven. We examined the product during the course of... 

Scheme 4.3 The reaction products and their morphologies obtained under microwave radiation with respect to time for the yttrium nitrate system.

Yttrium and compounds (yttrium metal, yttrium nitrate hexahy-drate, yttrium chloride, yttrium oxide) Dusts may be Irritating to the eyes and resplratoiy tract. 1 mg/m (as Y) 500 mg/m Appearance varies with compound. 

---