Talk:Mercury cadmium telluride

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Costs[edit]

There seems to be a contradiction between the statement "Owing to its cost, the use of HgCdTe has so far been largely restricted to the military field, remote sensing and infrared astronomy research. Military technology has depended on HgCdTe for night vision. In particular, the US air force makes extensive use of HgCdTe on all aircraft, and to equip airborne smart bombs. A variety of heat-seeking missiles are also equipped with HgCdTe detectors. HgCdTe detector arrays can also be found at most of the worlds major research telescopes including several satellites. Many HgCdTe detectors (such as Hawaii and NICMOS detectors) are named after the astronomical observatories or instruments for which they were originally developed."

and

"HgCdTe is often a material of choice for detectors in Fourier-transform infrared (FTIR) spectrometers. This is because of the large spectral range of HgCdTe detectors and also the high quantum efficiency."

What is true? As there is an FTIR spectrometer in pretty much every better chemistry lab, one statements must be incorrect... Could someone who is familiar with construction and sales knowledge of FTIR specs please clarify this? Thanks! —Preceding unsigned comment added by 129.13.72.198 (talk) 13:11, 29 November 2010 (UTC)[reply]

Can't tell the price by heart, but MCT (HgCdTe) is a common detector in conventional FTIRs. Fixing the article. Materialscientist (talk) 23:37, 29 November 2010 (UTC)[reply]

Spectral response curve[edit]

could we please get a spectral response curve for this page.

It is different for every composition and, for thin detectors, for every thickness. Jaraalbe 16:36, 30 May 2006 (UTC)[reply]

I'd also like to see some plots precisely because they change with composition and thickness. Could you plot two spectral curves for two different Hg/Cd composition? Better yet, if responsivity changes very nonlinearly with composition, a few more? Then make another plot to show the effect of thickness? Thanks! Xiangqian 19:12, 14 March 2007 (UTC)[reply]

Proposed move[edit]

The standard is for chemicals to be listed under their chemical name, rather than their chemical formula. -- mastodon 14:29, 2 June 2006 (UTC)[reply]

The problem is which name to use with a ternary alloy: HgCdTe, CdHgTe, (Cd,Hg)Te, (Hg,Cd)Te, Cadmium mercury telluride (alphabetic), Mercury cadmium telluride (majority element in most IR detector work), Mercad telluride ("colloquial"), Hg_1-xCd_xTe, Cd_xHg_1-xTe, (Hg_1-xCd_x)Te. Perhaps more accurate still is either Mercury(II) cadmium(II) telluride or Cadmium(II) mercury(II) telluride. Perhaps a list of Google hit numbers can inform us of what commonly used to describe this material, HgCdTe (273000), CdHgTe (20100), Mercury cadmium telluride (71500), Cadmium mercury telluride (940), (Cd,Hg)Te (185), Mercad telluride (34) and Mercury(II) cadmium(II) telluride (0). The most common is HgCdTe - hence the reason why I named it such. People need to be able to find an article directly. Unless we can agree a common name it should remain HgCdTe. Jaraalbe 20:37, 2 June 2006 (UTC)[reply]

I will state my preference list with reasons 1) HgCdTe (unchanged) for reasons of customary use and associated navigational and search engine ease of location. 2) Mercury cadmium telluride (majority metal first for most applications)). 3) Cadmium mercury telluride. 4) There are no web references for Mercury(II) cadmium(II) telluride, this should not be a major navigational name - but should be mentioned in the article as a conventionally correct name. Jaraalbe 06:47, 7 June 2006 (UTC)[reply]

COMMENT the suggested Mercury (II) cadmium (II) telluride sounds best. 132.205.44.134 02:24, 4 June 2006 (UTC)[reply]
Move, the page name is far too confusing and I have not seen any article for a chemical compound have a page name using the element symbols. However, I'm not sure what the page's new name should be because I don't understand the process of naming compounds and using things like (II) or (III) in the names. --Evan Robidoux 21:02, 5 June 2006 (UTC)[reply]

II and III represent different molecular bonding states of the atoms attached to the II, III, ... Depending on the Roman Numeral, different bondings can occur from the regular state (I). There are several WP articles with (II) etc in their names.

Moved to Mercury(II) cadmium(II) telluride. —Nightst a llion (?) 11:41, 7 June 2006 (UTC)[reply]

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Direct or indirect band gap[edit]

There is no info on the type or properties of the band gap Direct and indirect band gaps. It appears to be direct resulting in less lifetime. This is implied by: "infrared light-emitting diodes and lasers have been made in HgCdTe" --Moritzgedig (talk) 19:34, 8 May 2020 (UTC)[reply]