Names | |
---|---|
IUPAC name
Pyrosilicate
| |
Other names
disilicate, diorthosilicate
| |
Identifiers | |
3D model (
JSmol)
|
|
ChEBI | |
ChemSpider | |
326578 | |
PubChem
CID
|
|
CompTox Dashboard (
EPA)
|
|
| |
| |
Properties | |
O7Si2−6 | |
Molar mass | 168.166 g·mol−1 |
Conjugate acid | Pyrosilicic acid |
Except where otherwise noted, data are given for materials in their
standard state (at 25 °C [77 °F], 100 kPa).
|
A pyrosilicate is a type of
chemical compound; either an
ionic compound that contains the pyrosilicate anion Si
2O6−
7, or an
organic compound with the
hexavalent ≡O
3Si-O-SiO
3≡
group. The anion is also called disilicate
[1] or diorthosilicate.
Ionic pyrosilicates can be considered
salts of the unstable
pyrosilicic acid, H
6Si
2O
7. Unlike the acid, the salts can be stable. Indeed, pyrosilicates occur widely in nature as a class of
silicate minerals, specifically the
sorosilicates.
Some notable synthetic pyrosilicates include
The pyrosilicate anion can be described as two SiO
4
tetrahedra that share a vertex (an
oxygen atom). The vertices that are not shared carry a negative charge each.
The structure of solid sodium pyrosilicate was described by Volker Kahlenberg and others in 2010. [5]
Yuri Smolin and
Yuri Shepelev determined in 1970 the crystal structures of pyrosilicates of
rare earth elements with generic formula Ln
2Si
2O
7, where "Ln" stands for either one of
lanthanum,
cerium,
neodymium,
samarium,
europium,
gadolinium,
dysprosium,
holmium,
yttrium,
erbium,
thulium, or
ytterbium. They were found to belong to four distinct
crystallographic classes, determined by the size of the
cation.
[6] Other researchers also studied
yttrium pyrosilicate Y
2Si
2O
7.,
[7]
[8]
gadolinium pyrosilicate Gd
2Si
2O
7.,
[8] and
scandium pyrosilicate Sc
2Si
2O
7.
[7]
Rare earth pyrosilicates Ln
2Si
2O
7 can be obtained by fusing the corresponding oxide Ln
2O
3 with silica in 1:2 molar ratio,
[6] Single crystals can be grown by the
Verneuil process
[6] or the
Czochralski method.
[7]
Names | |
---|---|
IUPAC name
Pyrosilicate
| |
Other names
disilicate, diorthosilicate
| |
Identifiers | |
3D model (
JSmol)
|
|
ChEBI | |
ChemSpider | |
326578 | |
PubChem
CID
|
|
CompTox Dashboard (
EPA)
|
|
| |
| |
Properties | |
O7Si2−6 | |
Molar mass | 168.166 g·mol−1 |
Conjugate acid | Pyrosilicic acid |
Except where otherwise noted, data are given for materials in their
standard state (at 25 °C [77 °F], 100 kPa).
|
A pyrosilicate is a type of
chemical compound; either an
ionic compound that contains the pyrosilicate anion Si
2O6−
7, or an
organic compound with the
hexavalent ≡O
3Si-O-SiO
3≡
group. The anion is also called disilicate
[1] or diorthosilicate.
Ionic pyrosilicates can be considered
salts of the unstable
pyrosilicic acid, H
6Si
2O
7. Unlike the acid, the salts can be stable. Indeed, pyrosilicates occur widely in nature as a class of
silicate minerals, specifically the
sorosilicates.
Some notable synthetic pyrosilicates include
The pyrosilicate anion can be described as two SiO
4
tetrahedra that share a vertex (an
oxygen atom). The vertices that are not shared carry a negative charge each.
The structure of solid sodium pyrosilicate was described by Volker Kahlenberg and others in 2010. [5]
Yuri Smolin and
Yuri Shepelev determined in 1970 the crystal structures of pyrosilicates of
rare earth elements with generic formula Ln
2Si
2O
7, where "Ln" stands for either one of
lanthanum,
cerium,
neodymium,
samarium,
europium,
gadolinium,
dysprosium,
holmium,
yttrium,
erbium,
thulium, or
ytterbium. They were found to belong to four distinct
crystallographic classes, determined by the size of the
cation.
[6] Other researchers also studied
yttrium pyrosilicate Y
2Si
2O
7.,
[7]
[8]
gadolinium pyrosilicate Gd
2Si
2O
7.,
[8] and
scandium pyrosilicate Sc
2Si
2O
7.
[7]
Rare earth pyrosilicates Ln
2Si
2O
7 can be obtained by fusing the corresponding oxide Ln
2O
3 with silica in 1:2 molar ratio,
[6] Single crystals can be grown by the
Verneuil process
[6] or the
Czochralski method.
[7]