Small quantities of iridium do not destroy the ductility of gold, but this is probably because the metal is only disseminated through the mass, and not alloyed, as it falls to the bottom of the crucible in which the gold is fused.
Defn: Of or pertaining to iridium; -- applied specifically to compounds in which iridium has a low valence.
Defn: A natural alloy of platinum and iridium occurring in grayish metallic rounded or cubical grains with platinum.
It is also used for the points of gold pens, and in a finely powdered condition (iridium black), for painting porcelain black.
Defn: Of or pertaining to iridium; -- said specifically of those compounds in which iridium has a relatively high valence.
Note: Iridium usually occurs as a native alloy with osmium (iridosmine or osmiridium), which may occur alone or with platinum.
Iridium and Osmium discovered by Tenant, and Cerium by Berzelius.
Platinum= is a rare metal found with gold, iridium and other rare metals in placer mines.
The residue is ignited in a crucible, boiled with water, and dried; it then consists of a mixture of sesquioxide of iron and a combination of oxide of iridium with sodium hydrate.
The contents of the tube, when cold, are treated with water to dissolve out the double chloride of iridium and sodium; the solution thus formed is mixed with an excess of carbonate of sodium, and evaporated to dryness.
It is reduced by hydrogen at a high temperature, and treated successively with water and strong hydrochloric acid, which remove the alkali and the iron, leaving metallic iridium in a divided state.
Iridium is mixed with platinum in order to increase its strength and durability.
The normal standards of the metrical system are made of platinum-iridium on account of its known immutabilty.
A great variety of lamps was made of the platinum-iridium type, mostly with thermal devices to regulate the temperature of the burner and prevent its being melted by an excess of current.
It depends for its action upon the heating effect of the current, which causes a fine platinum-iridium wire enclosed in a glass tube to expand; thus allowing a coiled spring to act on a pivoted shaft carrying a tiny mirror.
Iridium forms many ammine derivatives, which are analogous to the corresponding platinum compounds (see M.
Iridium tetrachloride, IrCl4, is obtained by dissolving the finely divided metal in aqua regia; by dissolving the hydroxide in hydrochloric acid; and by digesting the hydrated sesquichloride with nitric acid.
Iridium is always determined quantitatively by conversion into the metallic state.
Iridium dioxide, IrO2, may be obtained as small needles by heating the metal to bright redness in a current of oxygen (G.
Iridium sesquioxide, Ir2O3, is obtained when potassium iridium chloride is heated with sodium or potassium carbonates, in a stream of carbon dioxide.
The iridium is then precipitated from the solution (as oxide) by the addition of baryta, dissolved in aqua regia, and precipitated as iridium ammonium chloride by the addition of ammonium chloride.
It may be obtained in the spongy form by igniting iridium ammonium chloride, and this variety of the metal readily oxidizes when heated in air.
The hydroxide, Ir(OH)3, may be obtained by the addition of caustic potash to iridium sodium chloride, the mixture being then heated with alcohol.
Iridium sulphide, IrS, is obtained when the metal is ignited in sulphur vapour.
Iridium sesquichloride, IrCl3, is obtained when one of the corresponding double chlorides is heated with concentrated sulphuric acid, the mixture being then thrown into water.
The disulphide, IrS2, is formed when powdered iridium is heated with sulphur and an alkaline carbonate.
The ore of osmium and iridium can be decomposed, and the former recognized by its fetid odor.
The metal palladium is found native, associated withiridium and platinum.
Iridium occurs in nature associated with osmium, gold, and platinum, in the mines of Russia.
The slit is next cut through the solidiridium point by means of a thin copper wheel fed with fine emery, and a saw extends the aperture along the pen itself.
The iridium for this purpose is found in small grains of platinum, slightly alloyed with this latter metal.
Gold pens with rhodium or iridium points were introduced soon afterwards.
The under side of the point is notched by a small circular saw to receive the iridium point, which is selected with the aid of a microscope.
Of or pertaining to iridium; -- said specifically of those compounds in which iridium has a relatively high valence.
Of or pertaining to iridium; -- applied specifically to compounds in which iridium has a low valence.
A natural alloy of platinum and iridium occurring in grayish metallic rounded or cubical grains with platinum.
The four elements gold, platinum, osmium, and iridium are the heaviest substances known, being about twice as heavy as lead.
Iridium is used in the form of a platinum alloy, since the alloy is much harder than pure platinum and is even less fusible.
Some iridium is also precipitated as a similar compound.
In an inconceivably short time, the eight-inch thickness of tungsto-iridium alloy flared incandescently and began to flow sluggishly.
If the dice have bits of iridium stuck under the six spots, they will throw aces.
The six-inch tungsto-iridium wall had been melted through.
The tungsto-iridium glowed briefly; then, as suddenly as the extinguishing of a light, the safe was gone!
What he wanted was the insurance and the ten million dollars' worth of iridium in the hold as well.
We've got to get the iridium out of the hold and into the liner as soon as possible, or we'll be sighted by some other craft.
He faced Winford bitterly, for this escaped lifer from Mercury had stolen not only his ship, but half his crew as well, and the prospect of a liberal share of the rich iridium cargo in the hold.
The commander of the battle sphere was again resuming his mission of searching for the missing liner, while the young officer and his crew were taking the Golden Fleece with its iridium cargo and pirate crew directly to Mars.
The left median basilic vein is selected, and a platino-iridium needle with a short point and a bore larger than that of the ordinary hypodermic syringe is used.
The syringe is made of glass, and has a solid glass piston; the needle of platino-iridium should be 5 cm.
I'm getting back to the iridium fields on Callisto.
Most of all he thought of Callisto and the iridium fields, which would mean much more tsith.
Before that it was Callisto, where he had struck it rich in the iridium fields; anyway, rich enough to keep him supplied with tsith for a year.
That'll be enough to get me out of here on the first freighter, and set up for another try at the Callisto iridium fields.
The ammunition hoists slipped noiselessly upward bearing the steel-iridium shells for the 8-inch guns, and the electric chains hauled up the 70-pounders for the secondary battery.
This anode simply consists of a square bit of platinum or platinum-iridium foil, measuring about 0.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "iridium" in a variety of sentences. We hope that you will now be able to make sentences using this word. Other words: gold; iron; lead; metal; silver
