Platinum black
Platinum Plat"i*num, n. [NL., fr. Sp. platina, from plata silver, LL. plata a thin plate of metal. See {Plate}, and cf. {Platina}.] (Chem.) A metallic element of atomic number 78, one of the noble metals, classed with silver and gold as a precious metal, occurring native or alloyed with other metals and also as the platinum arsenide (sperrylite). It is a heavy tin-white metal which is ductile and malleable, but very infusible (melting point 1772[deg] C), and characterized by its resistance to strong chemical reagents. It is used for crucibles in laboratory operations, as a catalyst, in jewelry, for stills for sulphuric acid, rarely for coin, and in the form of foil and wire for many purposes. Specific gravity 21.5. Atomic weight 195.1. Symbol Pt. Formerly called {platina}. [1913 Webster +PJC]

{Platinum black} (Chem.), a soft, dull black powder, consisting of finely divided metallic platinum obtained by reduction and precipitation from its solutions. It absorbs oxygen to a high degree, and is employed as an oxidizer.

{Platinum lamp} (Elec.), a kind of incandescent lamp of which the luminous medium is platinum. See under {Incandescent}.

{Platinum metals} (Chem.), the group of metallic elements which in their chemical and physical properties resemble platinum. These consist of the light platinum group, viz., rhodium, ruthenium, and palladium, whose specific gravities are about 12; and the heavy platinum group, viz., osmium, iridium, and platinum, whose specific gravities are over 21.

{Platinum sponge} (Chem.), metallic platinum in a gray, porous, spongy form, obtained by reducing the double chloride of platinum and ammonium. It absorbs oxygen, hydrogen, and certain other gases, to a high degree, and is employed as an agent in oxidizing. [1913 Webster]


The Collaborative International Dictionary of English. 2000.

Look at other dictionaries:

  • Platinum black — (Pt black) is a fine powder of platinum with good catalytic properties. The name of platinum black is due to its black color. Platinum black is widely used as a thin film covering solid platinum metal, forming platinum electrodes for applications …   Wikipedia

  • platinum black — n. a black powder of finely divided metallic platinum, made by reduction of platinum salts: used as a catalyst, as in organic synthesis …   English World dictionary

  • Platinum black — Platinum black. См. Черная платина. (Источник: «Металлы и сплавы. Справочник.» Под редакцией Ю.П. Солнцева; НПО Профессионал , НПО Мир и семья ; Санкт Петербург, 2003 г.) …   Словарь металлургических терминов

  • platinum black — platinos juodžiai statusas T sritis chemija apibrėžtis Smulkiadispersiai platinos milteliai, gaunami redukuojant jos junginius. atitikmenys: angl. platinum black; spongy black platinum rus. платиновая чернь …   Chemijos terminų aiškinamasis žodynas

  • platinum black — black powder made from divided metallic platinum …   English contemporary dictionary

  • platinum black — Chem. a black powder consisting of very finely divided metallic platinum, used as a catalyst, esp. in organic synthesis. [1850 55] * * * …   Universalium

  • platinum black — noun platinum in the form of a finely divided black powder, used as a catalyst and absorbent for gases …   English new terms dictionary

  • platinum black — /plætənəm ˈblæk/ (say platuhnuhm blak) noun a black powder consisting of very finely divided metallic platinum, used as a catalyst, especially in organic synthesis …   Australian English dictionary

  • platinum black — noun a fine black powder of platinum; used as a catalyst in chemical reactions • Hypernyms: ↑catalyst, ↑accelerator …   Useful english dictionary

  • Platinum — Plat i*num, n. [NL., fr. Sp. platina, from plata silver, LL. plata a thin plate of metal. See {Plate}, and cf. {Platina}.] (Chem.) A metallic element of atomic number 78, one of the noble metals, classed with silver and gold as a precious metal,… …   The Collaborative International Dictionary of English

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