(n.) A mineral occurring in tetragonal crystals, usually of a brown or gray color. It consists of silica and zirconia. A red variety, used as a gem, is called hyacinth. Colorless, pale-yellow or smoky-brown varieties from Ceylon are called jargon.
Example Sentences:
(1) Modern ultrasonic transducers mainly employ lead zirconate titanate (PZT) but vinylidene fluoride trifluoroethylene copolymer (P (VDF-TrPE)) is becoming more competitive.
(2) The application of zircon (ZrSiO4) that has high refractoriness, high thermal conductivity and a low coefficient of thermal expansion, to quick casting investment was studied.
(3) Disk-shaped implants of spinel, alumina, mullite, zircon, a cast Co-Cr-Mo alloy, and ultra-high molecular weight polyethylene (UHMWPE), were implanted in the paraspinalis muscle of 12 adult, male, white New Zealand rabbits.
(4) Some samples of red mud, phosphogypsum, zircon products and fly ash did show higher levels of radioactivity than would be acceptable on the basis of a criterion formula for gamma-ray activity suggested for use in some OECD countries.
(5) An Ontario plant with 101 workers, producing and using the ceramic compound lead titanate zirconate (LTZ), was investigated.
(6) The acoustic emission from cavitation in the field of an extracorporeal shock wave lithotripter has been studied using a lead zirconate titanate piezoceramic (PC4) hydrophone in the form of a 100-mm diameter focused bowl of 120-mm focal length.
(7) Further heating changed surface structure and led to zircon production in the zirconia fibres.
(8) 2) Dainainvest (Ohara) mainly containing zircon indicated the reduction in surface roughness due to coating.
(9) Small casting of pure titanium and K-metal could be done successfully by the quick casting method using the zircon-phosphoric acid investments.
(10) Results were as follows: 1) The refractory compositions of seven commercialized coating materials were composed of alpha-quartz (SiO2), zircon (ZrSiO4) and zirconium oxide (ZrO2).
(11) The transducer usually consists of a piezoelectric crystal composed of such ceramic materials as barium titanate, lead titanate, zirconate, or lead metaniobate.
(12) Working processes using zircon sand in a factory producing refractory material were studied from the point of view of radiation protection.
(13) Zircon sand contains high concentrations of natural radionuclides and is a typical example of an enhanced source.
(14) Although zircon was slightly observed on the cast surface, the product of reaction was not detected.
(15) Formulation of zircon slurry for coating was zircon flower #600 30%, zircon flower #350 10%, and zircon sand CP 60%, and that for sanding was zircon flower #200.
(16) Immediately after coating with zircon slurry, the coating layer was dried, sintered and dewaxed by thermal shock.
(17) A new family of materials consisting of lead lanthanium zirconate titanate (PLZT) has evolved from recent advances in ferroelectric ceramics.
(18) We used a flat or focused, 10 mm diameter transducer made of lead zirconate-titanate with a resonant frequency of 2 or 3 MHz at a repetition rate of 3.6 kHz.
(19) 3) Liquid investment (Nobilium) and Paint investment (Shofu) having about equal amounts of alpha-quartz and zircon showed as reduction in surface roughness as Dainainvest.
(20) Various zircon powders and phosphoric acid solutions were tested with respect to the higher thermal shock resistance.
Zirconium
Definition:
(n.) A rare element of the carbon-silicon group, intermediate between the metals and nonmetals, obtained from the mineral zircon as a dark sooty powder, or as a gray metallic crystalline substance. Symbol Zr. Atomic weight, 90.4.
Example Sentences:
(1) The sodium (Na) zinc (Zn) and zirconium (Zr) derivatives of PT were studied and the effects of duration of contact and concentration of the NaPT and ZnPT in test solutions were examined.
(2) The elements added to increase radiopacity in the composite materials are barium, strontium, zinc, zirconium, and ytterbium.
(3) The energy was coupled into a 250-microns core diameter zirconium-fluoride fiber.
(4) The residue was taken up with 2 M perchloric acid and zirconium in the solution was extracted with 0.1 M thenoyltrifluoroacetone (TTA) in benzene.
(5) Porous microparticulate zirconium oxide shows very different selectivities and pH dependencies for the separation of benzoic acid derivatives than do conventional bonded-phase anion-exchange supports.
(6) Cellulose was converted into a more reactive form by chelation with the transition metals titanium(III), iron(III), tin(IV), vanadium(III), and zirconium(IV).
(7) A high in vitro stability of the zirconium-desferal complex was observed; less than 0.2% zirconium was lost within 24 h in plasma-solutions.
(8) All processes are based mainly on ion-exchange separations using amorphous zirconium phosphate.
(9) After administration at low doses of soluble salt of hafnium, this element was similarly concentrated in nodular lymphatic cells and was as zirconium uniquely localized in the lysosomes of macrophages where it is associated with phosphorus.
(10) The 99Mo is present as a zirconium molybdate gel, the high molybdate content of which allows the use of (n, gamma) 99Mo.
(11) The cause of this impaired calcemic response was investigated by reinfusing rats with their own urine that had been pretreated with either activated charcoal or zirconium oxide in two different anionic forms, or urine that had been ultrafiltrated through an Amicon membrane of which the stated molecular-weight cut-off of the smallest pore-size membrane was 500 daltons.
(12) Although zirconium fluoride fibers have high through-put efficiencies that facilitate study of laser tissue interactions at 2.94 microns, problems encountered with fragility and solubility of the bare tip in aqueous media limit its usefulness.
(13) An automated method, based on the chelating reaction of calcium disodium edetate with zirconium and the subsequent determination of excess zirconium reacted with xylenol orange, was developed.
(14) In this work we have studied intracellular concentration sites of zirconium after injection of low doses of zirconium sulphate.
(15) Other components registered in quantities of 5-10 wt-% were barium, aluminum, zinc, and zirconium.
(16) Laser energy was delivered as a single pulse (250 microseconds) by tissue fiber optic contact with low hydroxyl-fused silica (200 and 500 microns), zirconium fluoride (250 microns), or sapphire (250 microns) fiber optics.
(17) Despite suspicion that inhalation of zirconium should be capable of causing human pulmonary disease, documentation of zirconium pneumoconiosis in humans has been lacking.
(18) The elements antimony, ruthenium, lead, and cesium were enriched on the smallest particles, indicating that they were in a volatile chemical form, while cerium, zirconium, and radium were nonvolatile at the combustion temperatures.
(19) Alveolar macrophages from the rabbit were exposed in the culture medium to zirconium and aluminum salts.
(20) In subjects exposed to a hot environment, short-term topical pretreatment with aluminium zirconium tetrachlorhydrate delayed the onset of visible sweating although it failed to prevent the response.