AskDefine | Define indium

Dictionary Definition

indium n : a rare soft silvery metallic element; occurs in small quantities in sphalerite [syn: In, atomic number 49]

User Contributed Dictionary

see Indium



ind(igo) + -ium, from the indigo lines in its spectrum


  1. a metallic chemical element (symbol In) with an atomic number of 49.

Related terms


metallic chemical element

External links

For etymology and more information refer to: (A lot of the translations were taken from that site with permission from the author)



  1. indium



  1. indium

Extensive Definition

Indium () is a chemical element with chemical symbol In and atomic number 49. This rare, soft, malleable and easily fusible poor metal is chemically similar to aluminium or gallium but more closely resembles zinc (zinc ores are also the primary source of this metal). Its current primary application is to form transparent electrodes from indium tin oxide in liquid crystal displays. It is widely used in thin-films to form lubricated layers (during World War II it was widely used to coat bearings in high-performance aircraft). It's also used for making particularly low melting point alloys, and is a component in some lead-free solders.

Notable characteristics

Indium is a very soft, silvery-white, relatively rare true metal with a bright luster. As a pure metal indium emits a high-pitched "cry", when it is bent. Both gallium and indium are able to wet glass.
One unusual property of indium is that its most common isotope is slightly radioactive; it very slowly decays by beta emission to tin. This radioactivity is not considered hazardous, mainly because its half-life is 4.41 years, four orders of magnitude larger than the age of the universe and nearly 50,000 times longer than that of natural thorium. Unlike its period 5 neighbor cadmium, indium is not a notorious cumulative poison.


The first large-scale application for indium was as a coating for bearings in high-performance aircraft engines during World War II. Afterwards, production gradually increased as new uses were found in fusible alloys, solders, and electronics. In the 1950s, tiny beads of it were used for the emitters and collectors of PNP alloy junction transistors. In the middle and late 1980s, the development of indium phosphide semiconductors and indium tin oxide thin films for liquid crystal displays (LCD) aroused much interest. By 1992, the thin-film application had become the largest end use. Other uses:


Indium (named after the indigo line in its atomic spectrum) was discovered by the German Ferdinand Reich and Hieronymous Theodor Richter in 1863 while they were testing zinc ores with a spectrograph in search of thallium. Richter went on to isolate the metal in 1867.

Occurrence and consumption

Indium ranks 61st in abundance in the Earth's crust at approximately 0.25 ppm , which means it is more than three times as abundant as silver, which occurs at 0.075 ppm . Up until 1924, there was only about a gram of isolated indium on the planet. Indium is produced mainly from residues generated during zinc ore processing but is also found in iron, lead, and copper ores. Canada is a leading producer of indium. The Teck Cominco refinery in Trail, BC, is the largest single source, with production of 32,500 kg in 2005, 41,800 kg in 2004 and 36,100 kg in 2003.
The amount of indium consumed is largely a function of worldwide LCD production. Worldwide production is currently 476 tonnes per year from mining and a further 650 tonnes per year from recycling . Demand has risen rapidly in recent years with the popularity of LCD computer monitors and televisions, which now account for 50% of indium consumption . Increased manufacturing efficiency and recycling (especially in Japan) maintain a balance between demand and supply. Demand increased as the metal is used in LCDs and televisions, and supply decreased when a number of Chinese mining concerns stopped extracting indium from their zinc tailings. In 2002, the price was US$94 per kilogram. The recent changes in demand and supply have resulted in high and fluctuating prices of indium, which from 2005 to 2007 ranged from US$700/kg to US$1,000/kg . Demand for indium is likely to continue to increase with large-scale manufacture of CIGS-based thin film solar technology starting by several companies in 2008, including Nanosolar and Miasole.
Based on content of indium in zinc ore stocks, there is a world-wide reserve base of approximately 6,000 tonnes of economically-viable indium . This figure has led to estimates suggesting that, at current consumption rates, there is only 13 years' supply of indium left . However, such estimates are often regarded as alarmist and scaremongering . The Indium Corporation, the largest processor of indium, claims that, on the basis of increasing recovery yields during extraction, recovery from a wider range of base metals (including tin, copper and other polymetallic deposits) and new mining investments, the long-term supply of indium is sustainable, reliable and sufficient to meet increasing future demands . This conclusion also seems reasonable in light of the fact that silver, a less abundant element, is currently mined at approximately 18,300 tonnes per annum , which is 40 times greater than current indium mining rates.


Pure indium in metal form is considered non-toxic by most sources. In the welding and semiconductor industries, where indium exposure is relatively high, there have been no reports of any toxic side-effects.
This may not be the case with indium compounds: there is some unconfirmed evidence that suggests that indium has a low level of toxicity. For example, indium trichloride anhydrous (InCl3) is quite toxic, while indium phosphide (InP) is both toxic and a suspected carcinogen.


External links

indium in Afrikaans: Indium
indium in Arabic: إنديوم
indium in Bengali: ইন্ডিয়াম
indium in Belarusian: Індый
indium in Bosnian: Indijum
indium in Catalan: Indi (element)
indium in Czech: Indium
indium in Corsican: Indiu
indium in Danish: Indium
indium in German: Indium
indium in Estonian: Indium
indium in Modern Greek (1453-): Ίνδιο
indium in Spanish: Indio (elemento)
indium in Esperanto: Indio
indium in Basque: Indio
indium in Persian: ایندیوم
indium in French: Indium
indium in Friulian: Indi
indium in Irish: Indiam
indium in Manx: Indjum
indium in Galician: Indio
indium in Korean: 인듐
indium in Armenian: Ինդիում
indium in Hindi: इण्डियम
indium in Croatian: Indij
indium in Ido: Indio
indium in Indonesian: Indium
indium in Icelandic: Indín
indium in Italian: Indio
indium in Hebrew: אינדיום
indium in Javanese: Indium
indium in Swahili (macrolanguage): Indi
indium in Haitian: Endyòm
indium in Kurdish: Îndiyûm
indium in Latin: Indium
indium in Latvian: Indijs
indium in Luxembourgish: Indium
indium in Lithuanian: Indis
indium in Limburgan: Indium
indium in Lojban: blajinme
indium in Hungarian: Indium
indium in Macedonian: Индиум
indium in Dutch: Indium
indium in Japanese: インジウム
indium in Norwegian: Indium
indium in Norwegian Nynorsk: Indium
indium in Occitan (post 1500): Indi (quimia)
indium in Uzbek: Indiy
indium in Polish: Ind
indium in Portuguese: Índio (elemento químico)
indium in Romanian: Indiu
indium in Quechua: Indyu
indium in Russian: Индий
indium in Sicilian: Ìndiu
indium in Simple English: Indium
indium in Slovak: Indium
indium in Slovenian: Indij
indium in Serbian: Индијум
indium in Serbo-Croatian: Indijum
indium in Finnish: Indium
indium in Swedish: Indium
indium in Tamil: இண்டியம்
indium in Thai: อินเดียม
indium in Vietnamese: Indi
indium in Turkish: İndiyum
indium in Ukrainian: Індій
indium in Chinese: 铟
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