What's the difference between zircon and zirconia?
Zircon
Definition:
(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.
Zirconia
Definition:
(n.) The oxide of zirconium, obtained as a white powder, and possessing both acid and basic properties. On account of its infusibility, and brilliant luminosity when incandescent, it is used as an ingredient of sticks for the Drummomd light.
Example Sentences:
(1) Purified boveine growth hormone labeled enzymatically with iodine-125 was covalently coupled to cyanogen bromide activated Sepharose 4B gel and to diazotized zirconia-clad glass beads.
(2) Hydroxyapatite ceramics with zirconia dispersion from fine powders synthesized hydrothermally were post-sintered at 1000-1300 degrees C under 200 MPa of argon for 1 h without capsules, after normal sintering in air at 1200 degrees C for 3 h. Densification was most significant with post-sintering at 1200 degrees C. Fracture toughness, Vickers hardness and elastic properties of these materials were investigated.
(3) These studies have shown that phosphate-modified zirconia is a useful high-performance ion-exchange support for the separation of cationic proteins and for blocking the sites responsible for the high affinity of zirconia towards certain anions.
(4) Two commercial investment materials, Ohara and Castmatic, and an experimental zirconia material were analyzed.
(5) A method for preparing cross-section transmission electron microscopy specimens from alumina and partially stabilized zirconia braze joints is described.
(6) Zirconia was used in this study for implant dental roots because of its superior properties over other materials used as dental roots in mechanical strength, toughness, workability, and biocompatibility.
(7) The fibres were examined in the 'as-manufactured' state and after heating at 1200 and 1400 degrees C. Devitrification of the fibres at 1200 degrees C probably gave mullite crystals on the surface and caused the formation of the high-temperature form of cristobalite and, in zirconia grade fibres, the high-temperature, tetragonal form of zirconia as well.
(8) To obtain inlay, crown and bridge types of titanium castings with sufficient size accuracy, zirconia investments with 10 mol % calcia were studied for their setting expansion, thermal expansion, total expansion, casting shrinkage compensation deficiency on fabrication method, particle size of zirconia, calcia and mixing liquid.
(9) Zirconia at 50 micrograms ml-1 adsorbed 99.95% of added E. coli O128 LPS.
(10) In addition, alumina and zirconia ceramic balls are now in routine clinical use in Europe.
(11) Ceramic fibres are manufactured largely from the aluminosilicate group of minerals but some contain only alumina, zirconia or silica.
(12) However, ageing for long periods in Ringer's solution promoted a surface layer of monoclinic zirconia.
(13) Detection of calcium and chlorine also suggested bonding of experimental zirconia via calcium chloride.
(14) Detection of aluminum, silicon, magnesium, zirconium and oxygen provided a basis to reason the presence of alumina (Al2O3), silica (SiO2), magnesia (MgO), and zirconia (ZrO2).
(15) Preliminary evaluation of bare or polymer-coated colloidal monoclinic zirconia of nominal particle size 100 nm indicated that it is an effective adsorbent for pyrogenic lipopolysaccharides (LPS) as measured by chemical and Limulus amebocyte lysate (LAL) assays.
(16) Results suggest the zirconia used is a superior ceramic coating to the alumina.
(17) Further heating changed surface structure and led to zircon production in the zirconia fibres.
(18) Extensive microcracking occurred around refractory particles and through matrix in experimental zirconia which is likely to have resulted from the firing of kyanite to 1400 degrees C, to the monoclinic to tetragonal transformation of any unstabilized ZrO2, or to the thermal expansion mismatch between kyanite and matrix.
(19) We implanted cylinders of alumina ceramics (Al2O3), zirconia ceramics (ZrO2) and SUS-316 L stainless steel into the distal femoral epiphyses of dogs and then made observations from 4 to 96 wk post-operatively.
(20) Some LPS contaminating BSA lacked affinity for zirconia.