Tellurium ( /tɪˈlʊəriəm/ or /tɛˈl(j)ʊəriəm/ te-LOOR-ee-əm) is a chemical element that has the symbol Te
and atomic number 52. A brittle, mildly toxic, silver-white metalloid
which looks similar to tin, tellurium is chemically related to selenium
and sulfur. Tellurium was discovered in 1782 by Franz-Joseph Müller von
Reichenstein in a mineral containing gold and tellurium. Martin Heinrich
Klaproth named the new element in 1798 after the Latin word for
"earth", tellus.
Although several gold deposits contain
tellurium minerals, the main commercial source for tellurium is as a
by-product of copper and lead production. Tellurium is primarily used in
alloys, foremost in steel and copper to improve machinability.
Applications in solar panels and as a semiconductor material also
consume a considerable fraction of tellurium production.
Tellurium
has no biological function, although fungi can incorporate it in place
of sulfur and selenium into amino acids such as telluro-cysteine and
telluro-methionine.[3] In humans, tellurium is partly metabolized into
dimethyl telluride, (CH3)2Te, a gas with a garlic-like odor which is
exhaled in the breath of victims of tellurium toxicity or exposure.
Contents
[hide]
- 1 Characteristics
- 1.1 Physical properties
- 1.2 Chemical properties
- 1.3 Isotopes
- 1.4 Occurrence
- 2 Production
- 3 Compounds
- 4 History
- 5 Applications
- 5.1 Metallurgy
- 5.2 Semiconductor and electronic industry uses
- 5.3 Other uses
- 6 Biological role
- 7 Precautions
- 8 References
- 9 External links
[edit] Characteristics
[edit] Physical properties
When
crystalline, tellurium is silvery-white and when it is in pure state
it has a metallic luster. It is a brittle and easily pulverized
metalloid. Amorphous tellurium is found by precipitating it from a
solution of tellurous or telluric acid (Te(OH)6).[4] Tellurium is a
p-type semiconductor that shows a greater electrical conductivity in
certain directions which depends on atomic alignment; the conductivity
increases slightly when exposed to light (photoconductivity).[5] When in
its molten state, tellurium is corrosive to copper, iron and stainless
steel.
[edit] Chemical properties
Tellurium
adopts a polymeric structure, consisting of zig-zag chains of Te
atoms. This gray material resists oxidation by air and is nonvolatile.
[edit] Isotopes
Main article: Isotopes of tellurium
Naturally
occurring tellurium has eight isotopes. Four of those isotopes, 122Te,
124Te, 125Te and 126Te, are stable. The other four, 120Te, 123Te,
128Te and 130Te, have been observed to be radioactive.[6][7] The
stable isotopes make up only 33.2 % of the naturally occurring
tellurium; this is possible due to the long half-lives of the unstable
isotopes. They are in the range from 1013 to 2.2 1024 years. This
makes 128Te the isotope with the longest half life among all
radioisotopes.[8]
There are 38 known nuclear isomers of tellurium
with atomic masses that range from 105 to 142. Tellurium is the
lightest element known to undergo alpha decay, with isotopes 106Te to
110Te being able to undergo this mode of decay.[6] The atomic mass of
tellurium (127.60 g·mol−1) exceeds that of the following element iodine
(126.90 g·mol−1).[9]
[edit] Occurrence
See also Category: Telluride minerals
Tellurium on quartz (Moctezuma, Sonora, Mexico)
With
an abundance in the Earth's crust comparable to that of platinum,
tellurium is one of the rarest stable solid elements in the Earth's
crust. Its abundance is about 1 µg/kg.[10] In comparison, even the
rarest of the lanthanides have crustal abundances of 500 µg/kg (see
Abundance of the chemical elements).[11]
The extreme rarity of
tellurium in the Earth's crust is not a reflection of its cosmic
abundance, which is in fact greater than that of rubidium, even
though rubidium is ten thousand times more abundant in the Earth's
crust. The extraordinarily low abundance of tellurium on Earth is
rather thought to be due to conditions in the Earth's formation, when
the stable form of certain elements, in the absence of oxygen and
water, was controlled by the reductive power of free hydrogen. Under
this scenario, certain elements such as tellurium which form volatile
hydrides were severely depleted during the formation of the Earth's
crust, through evaporation of these hydrides. Tellurium and selenium
are the heavy elements most depleted in the Earth's crust by this
process.[citation needed]
Tellurium is sometimes found in
its native (elemental) form, but is more often found as the tellurides
of gold (calaverite, krennerite, petzite, sylvanite and others).
Tellurium compounds are the most common chemical compounds of gold
found in nature (rare non-tellurides such as gold aurostibite and
bismuthide are known). Tellurium is also found combined with elements
other than gold, in salts of other metals. In contrast to selenium,
tellurium is not able to replace sulfur in its minerals. This is due
to the large difference in ion radius of sulfur and tellurium. In
consequence, many sulfide minerals contain considerable amounts of
selenium, but only traces of tellurium.[12]
In the gold rush of
1893, diggers in Kalgoorlie discarded a pyritic material which got in
their way as they searched for pure gold. The Kalgoorlie waste was
thus used to fill in potholes or as part of sidewalks. Three years
passed before it was realized that this waste was calaverite, a
telluride of gold that had not been recognized. This led to a second
gold rush in 1896 which included mining the streets.[13]
[edit] Production
The
principal source of tellurium is from anode sludges produced during
the electrolytic refining of blister copper. It is a component of dusts
from blast furnace refining of lead. Treatment of 500 tons of copper
ore typically yields one pound (0.45 kg) of tellurium. Tellurium is
produced mainly in the United States, Peru, Japan, and Canada.[14] For
the year 2006 the British Geological Survey gives the following
numbers: United States 50 t, Peru 37 t, Japan 24 t and Canada 11 t.[15]
Tellurium production 2006
The
anode sludges contain the selenides and tellurides of the noble metals
in compounds with the formula M2Se or M2Te (M = Cu, Ag, Au). At
temperatures of 500 °C the anode sludges are roasted with sodium
carbonate under air. The metal ions are reduced to the metals, while
the telluride is converted to sodium tellurite.[16]
M2Te + O2 + Na2CO3 → Na2TeO3 + 2 M + CO2
Tellurites
can be leached from the mixture with water and are normally present as
hydrotellurites HTeO3- in solution. Selenites are also formed during
this process, but they can be separated by adding sulfuric acid. The
hydrotellurites are converted into the insoluble tellurium dioxide
while the selenites stay in solution.[16]
HTeO3- + OH- + H2SO4 → TeO2 + 2 SO42− + 2 H2O
The
reduction to the metal is done either by electrolysis or by reacting
the tellurium dioxide with sulfur dioxide in sulfuric acid.[16]
TeO2 + 2 SO2 + 2H2O → Te + SO42− + 4 H+
Commercial-grade
tellurium is usually marketed as minus 200-mesh powder but is also
available as slabs, ingots, sticks, or lumps. The year-end price for
tellurium in 2000 was US$14 per pound. In recent years, the tellurium
price was driven up by increased demand and limited supply, reaching as
high as US$100 per pound in 2006.[17][18]
[edit] Compounds
See also Category: Tellurium compounds
Tellurium
belongs to the same chemical family as oxygen, sulfur, selenium and
polonium: the chalcogen family. Tellurium and selenium compounds are
similar. It exhibits the oxidation states −2, +2, +4 and +6, with the
+4 state being most common.[4]
Tellurides
Reduction
of Te metal produces the Tellurides and polytellurides, Ten2-. The −2
oxidation state is exhibited in binary compounds with many metals, such
as zinc telluride, ZnTe, formed by heating tellurium with zinc.[19]
Decomposition of ZnTe with hydrochloric acid yields hydrogen telluride
(H2Te), a highly unstable analogue of the other chalcogen hydrides,
H2O, H2S and H2Se:
ZnTe + 2 HCl → ZnCl2 + H2Te
H2Te is unstable, whereas salts of its conjugate base [TeH]- are stable.
Halides
The
+2 oxidation state is exhibited by the dihalides, TeCl2, TeBr2 and
TeI2. The dihalides have not been obtained in pure form,[20]:274
although they are known decomposition products of the tetrahalides in
organic solvents, and their derived tetrahalotellurates are
well-characterized:
Te + X2 + 2 X− → TeX2−
4
where
X is Cl, Br, or I. These anions are square planar in geometry.[20]:281
Polynuclear anionic species also exist, such as the dark brown Te2I2−
6,[20]:283 and the black Te4I2−
14.[20]:285
Fluorine
forms two halides with tellurium: the mixed-valence Te2F4 and TeF6. In
the +6 oxidation state, the –OTeF5 structural group occurs in a number
of compounds such as HOTeF5, B(OTeF5)3, Xe(OTeF5)2, Te(OTeF5)4 and
Te(OTeF5)6.[21] The square antiprismatic anion TeF2−
8 is also
attested.[16] The other halogens do not form halides with tellurium in
the +6 oxidation state, but only tetrahalides (TeCl4, TeBr4 and TeI4)
in the +4 state, and other lower halides (Te3Cl2, Te2Cl2, Te2Br2, Te2I
and two forms of TeI). In the +4 oxidation state, halotellurate anions
are known, such as TeCl2−
6 and Te2Cl2−
10. Halotellurium cations are also attested, including TeI+
3, found in TeI3AsF6.[22]
Oxocompounds
A sample of tellurium dioxide powder
Tellurium
monoxide was first reported in 1883 as a black amorphous solid formed
by the heat decomposition of TeSO3 in vacuum, disproportionating into
tellurium dioxide, TeO2 and elemental tellurium upon heating.[23][24]
Since then, however, some doubt has been cast on its existence in the
solid phase, although it is known as a vapor phase fragment; the black
solid may be merely an equimolar mixture of elemental tellurium and
tellurium dioxide.[25]
Tellurium dioxide is formed by
heating tellurium in air, causing it to burn with a blue flame.[19]
Tellurium trioxide, β-TeO3, is obtained by thermal decomposition of
Te(OH)6. The other two forms of trioxide reported in the literature,
the α- and γ- forms, were found not to be true oxides of tellurium in
the +6 oxidation state, but a mixture of Te4+, OH− and O−
2.[26] Tellurium also exhibits mixed-valence oxides, Te2O5 and Te4O9.[26]
The
tellurium oxides and hydrated oxides form a series of acids, including
tellurous acid (H2TeO3), orthotelluric acid (Te(OH)6) and metatelluric
acid ((H2TeO4)n).[25] The two forms of telluric acid form tellurate salts containing the TeO2–
4 and TeO6−
6 anions, respectively. Tellurous acid forms tellurite salts containing the anion TeO2−
3. Other tellurium cations include TeF2+
8, which consists of two fused tellurium rings and the polymeric TeF2+
7.
Zintl cations
When tellurium is treated with concentrated sulfuric acid, it forms red solutions containing the Zintl ion, Te2+
4.[27]
The oxidation of tellurium by AsF5 in liquid SO2 also produces this
square planar cation, as well as with the trigonal prismatic,
yellow-orange Te4+
6:[16]
4 Te + 3 AsF5 → Te2+
4(AsF−
6)2 + AsF3
6 Te + 6 AsF5 → Te4+
6(AsF−
6)4 + 2 AsF3
Other tellurium Zintl cations include the polymeric Te2+
7 and the blue-black Te2+
8,
which consists of two fused 5-membered tellurium rings. The latter
cation is formed by the reaction of tellurium with tungsten
hexachloride:[16]
8 Te + 2 WCl6 → Te2+
8(WCl−
6)2
Interchalcogen cations also exist, such as Te2Se2+
6 (distorted cubic geometry) and Te2Se2+
8. These are formed by oxidizing mixtures of tellurium and selenium with AsF5 or SbF5.[16]
Organotellurium compounds
Main article: Organotellurium chemistry
Tellurium
does not readily form analogues of alcohols and thiols, with the
functional group –TeH and are called tellurols. The –TeH functional
group is also attributed to using the prefix tellanyl-.[28]
Like H2Te, these species are unstable with respect to loss of H2.
Telluraethers (R-Te-R) are more stable as are telluroxides.
[edit] History
Klaproth named the new element and credited von Reichenstein with its discovery
Tellurium (Latin tellus
meaning "earth") was discovered in the 18th century in a gold ore from
the mines in Zlatna, near what is now Sibiu, Transylvania. This ore
was known as "Faczebajer weißes blättriges Golderz" (white leafy gold
ore from Faczebaja) or antimonalischer Goldkies (antimonic gold pyrite), and, according to Anton von Rupprecht, was Spießglaskönig (argent molybdique),
containing native antimony.[29][30] In 1782 Franz-Joseph Müller von
Reichenstein, who was then serving as the Austrian chief inspector of
mines in Transylvania, concluded that the ore did not contain antimony,
but that it was bismuth sulfide.[31] The following year, he reported
that this was erroneous and that the ore contained mostly gold and an
unknown metal very similar to antimony. After a thorough
investigation which lasted for three years and consisted of more than
fifty tests, Müller determined the specific gravity of the mineral and
noted the radish-like odor of the white smoke which passed off when the
new metal was heated, the red color which the metal imparts to
sulfuric acid, and the black precipitate which this solution gives
when diluted with water. Nevertheless, he was not able to identify
this metal and gave it the names aurum paradoxium and metallum problematicum, as it did not show the properties predicted for the expected antimony.[32][33][34]
In
1789, another Hungarian scientist, Pál Kitaibel, also discovered the
element independently in an ore from Deutsch-Pilsen which had been
regarded as argentiferous molybdenite, but later he gave the credit to
Müller. In 1798, it was named by Martin Heinrich Klaproth who earlier
isolated it from the mineral calaverite.[33][34][35]
Tellurium was
used as a chemical bonder in the making of the outer shell of the
first atomic bomb. The 1960s brought growth in thermoelectric
applications for tellurium, as well as its use in free-machining steel,
which became the dominant use.[citation needed]
[edit] Applications
[edit] Metallurgy
The
largest consumer of tellurium is metallurgy, where it is used in iron,
copper and lead alloys. When added to stainless steel and copper it
makes these metals more machinable. It is alloyed into cast iron for
promoting chill for spectroscopic purposes, as the presence of
electrically conductive free graphite tends to deleteriously affect
spark emission testing results. In lead it improves strength and
durability and decreases the corrosive action of sulfuric acid.[36]
[edit] Semiconductor and electronic industry uses
A CdTe photovoltaic array
Tellurium
is used in cadmium telluride (CdTe) solar panels. National Renewable
Energy Laboratory lab tests using this material achieved some of the
highest efficiencies for solar cell electric power generation. Massive
commercial production of CdTe solar panels by First Solar in recent
years has significantly increased tellurium demand.[37][38][39] If some
of the cadmium in CdTe is replaced by zinc then (Cd,Zn)Te is formed
which is used in solid-state x-ray detectors.[40]
Alloyed with
both cadmium and mercury, to form mercury cadmium telluride, an
infrared sensitive semiconductor material is formed.[41]
Organotellurium compounds such as dimethyl telluride, diethyl telluride,
diisopropyl telluride, diallyl telluride and methyl allyl telluride
are used as precursors for Metalorganic vapor phase epitaxy growth of
II-VI compound semiconductors.[42] Diisopropyl telluride (DIPTe) is
employed as the preferred precursor for achieving the low-temperature
growth of CdHgTe by MOVPE.[43] For these processes highest purity
metalorganics of both selenium and tellurium are used. The compounds
for semiconductor industry and are prepared by adduct
purification.[44][45]
Tellurium as a tellurium suboxide is used in
the media layer of several types of rewritable optical discs,
including ReWritable Compact Discs (CD-RW), ReWritable Digital Video
Discs (DVD-RW) and ReWritable Blu-ray Discs.[46][47]
Tellurium is
used in the new phase change memory chips.[48] developed by Intel.[49]
Bismuth telluride (Bi2Te3) and lead telluride are working elements of
thermoelectric devices. Lead telluride is used in far-infrared
detectors.
[edit] Other uses
- Used to color ceramics.[50]
- The
strong increase in optical refraction upon the addition of selenides
and tellurides into glass is used in the production of glass fibers for
telecommunications. These chalcogenide glasses are widely
used.[51][52] - Mixtures of Selenium and tellurium are used with barium peroxide as oxidizer in the delay powder of electric blasting caps.[53]
- Organic
tellurides have been employed as initiators for living radical
polymerization and electron-rich mono- and di-tellurides possess
antioxidant activity. - Rubber can be vulcanized with tellurium
instead of sulfur or selenium. The rubber produced in this way shows
improved heat resistance.[54] - Tellurite agar is used to
identify member of the corynebacterium genus, most typically
Corynebacterium diphtheriae, the pathogen responsible for
diphtheria.[55]
[edit] Biological role
Tellurium
has no known biological function, although fungi can incorporate it
in place of sulfur and selenium into amino acids such as
telluro-cysteine and telluro-methionine.[citation needed]
Organisms have shown a highly variable tolerance to tellurium
compounds. Most organisms metabolize tellurium partly to form dimethyl
telluride although dimethyl ditelluride is also formed by some species.
Dimethyl telluride has been observed in hot springs at very low
concentrations.[56][57][58]
[edit] Precautions
Tellurium
and tellurium compounds are considered to be mildly toxic and need to
be handled with care, although acute poisoning is rare.[59] Tellurium
is not reported to be carcinogenic.[59]
Humans exposed to as
little as 0.01 mg/m3 or less in air develop "tellurium breath", which
has a garlic-like odor.[50] The garlic odor that is associated with
human intake of tellurium compounds is caused from the tellurium being
metabolized by the body. When the body metabolizes tellurium in any
oxidation state, the tellurium gets converted into dimethyl telluride,
(CH3)2Te, which is volatile and is the cause of the garlic-like
smell. Even though the metabolic pathways of tellurium are not known,
it is generally assumed that they resemble those of the more
extensively studied selenium, because the final methylated metabolic
products of the two elements are similar.[60][61][62]
引用出處：
http://en.wikipedia.org/wiki/Tellurium
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mould & die, aero space and electronic industry. Our main products
include solid carbide / HSS end mills, micro electronic drill, IC card
cutter, engraving cutter, shell end mills, cutting saw, reamer, thread
reamer, leading drill, involute gear cutter for spur wheel, rack and
worm milling cutter, thread milling cutter, form cutters for spline
shaft/roller chain sprocket, and special tool, with nano grade. Please
visit our web www.tool-tool.com for more info.
