Английская Википедия:Arsenate arsenite
An arsenate arsenite is a chemical compound or salt that contains arsenate and arsenite anions (AsO33- and AsO43-). These are mixed anion compounds or mixed valence compounds. Some have third anions. Most known substances are minerals, but a few artificial arsenate arsenite compounds have been made. Many of the minerals are in the Hematolite Group.
An arsenate arsenite compound may also be called an arsenite arsenate.
Properties
Some members of this group of materials like mcgovernite has an extremely high unit cell dimension of 204 Å.[1]
Related
Mixed valence pnictide compounds related to the arsenate arsenites include the nitrite nitrates, and phosphate phosphites.
List
name | formula | ratio
AsO4:AsO3 |
system | space group | unit cell Å | volume | density | properties | references |
---|---|---|---|---|---|---|---|---|---|
Arsenic dioxide | AsO2 | 1:1 | orthorhomnic | Pnma | a=8.597 b=5.235 c=7.269 Z=8 | 327.1 | 4.382 | [2] | |
Arsenic(III) Arsenic(V) Oxide Hydroxide | As3O5(OH) | 1:2 | monoclinic | P21/c | a = 12.504 b = 4.593 c = 10.976 β = 118.08° Z = 4 | 556.2 | 3.84 | [3] | |
H6As3+7As5+7O31 | 1:1 | hexagonal | P63 | a = 12.0525 c = 4.7344 Z = 2 | 595.6 | [4] | |||
Segerstromite | Ca3(As5+O4)2[As3+(OH)3]2 | 2:1 | cubic | I213 | a = 10.7627 Z = 4 | 1246.71 | 3.46 | colourless; refract index: n = 1.731 | [5] |
Synadelphite | Mn2+9(As5+O4)2(As3+O3)(OH)9 · 2H2O | 2:1 | Orthorhombic | Pnma | a = 10.75 b = 18.86c = 9.88 Z=4 | 2005 | 3.58 | red; Biaxial (+); refract index: nα = 1.750 - 1.870 nβ = 1.751 - 1.880 nγ = 1.761 - 1.930 | [6] |
Hematolite | (Mn,Mg,Al,Fe3+)15(As5+O4)2(As3+O3)(OH)23 | 2:1 | trigonal | RШаблон:Overbar | a = 8.275 Å, c = 36.60 Å Z=3 | 2,170.4 | 3.49 | deep red; Uniaxial (-) refractive index nω = 1.733 nε = 1.714; Birefringence: 0.019 | [7][8] |
Turtmannite | (Mn,Mg)22.5Mg3-3x((V5+,As5+)O4)3(As3+O3)x(SiO4)3O5-5x(OH)20+x | trigonal | a = 8.259 c = 204.3 Z=12 | 12,068 | 3.8 | light yellow; Uniaxial (-); refractive index: nε = 1.787 | [9] | ||
Carlfrancisite | Mn2+3(Mn2+,Mg,Fe3+,Al)42[As3+O3]2(As5+O4)4[(Si,As5+)O4]6[(As5+,Si)O4]2(OH)42 | trigonal | RШаблон:Overbarc | a = 8.2238 c = 205.113 Z=6 | 12,013.5 | 3.620 | yellow-orange; Uniaxial (+) refractive index: nω = 1.756(2) nε = 1.758 Birefringence: δ = 0.002 | [10] | |
K2Cu3(As2O6)2 | 1:1 | monoclinic | C2m | a=10.359 b=5.388 c=11.234 β=110.48° | [As(V)As(III)O6]4− | [11] | |||
Dixenite | CuMn2+14Fe2+(SiO4)2(As5+O4)(As3+O3)5(OH)6 | 1:5 | trigonal | R3 | a = 8.233 c = 37.499 Z=3 | 2201 | 4.35 | deep red-brown; Uniaxial (+) refractive index nω = 1.970 nε = 1.730 | [12] |
Arakiite | (Zn,Mn2+)(Mn2+,Mg)12(Fe3+,Al)2(As5+O4)2(As3+O3)(OH)23 | 2:1 | monoclinic | Cc | a = 14.248 b = 8.228 c = 24.23 β = 93.62° Z=4 | 2843 | 3.41 | orange-red brown; Biaxial (-); refract index: nα = 1.723 nβ = 1.744 nγ = 1.750
Birefringence: 0.027 |
[13] |
Kraisslite | Zn3(Mn,Mg)25(Fe3+,Al)(As3+O3)2[(Si,As5+)O4]10(OH)16 | 5:1 | Orthorhombic | C2221 | a = 8.1821 b = 14.1946 c = 43.9103 Z=4 | 5099.8 | 3.876 | pale red; Uniaxial (+) Refractive index: nε = 1.805 | [14] |
Mcgovernite | Mn19Zn3(AsO4)3(AsO3)(SiO4)3(OH)21 | 3:1 | trigonal | R3m or RШаблон:Overbarm | a = 8.22 c = 203.1 Z=6 | 11,887.52 | 3.719 | brown; Uniaxial (+) Refractive index: nω = 1.757 nε = 1.760
Birefringence: δ = 0.003 |
[15] |
Halilsarpite | [Mg(H2O)6][CaAs3+2(Fe3+2.67Mo6+0.33)(AsO4)2O7] | orthorhomnic | Imma | a = 26.489 b = 7.4205 c = 10.4378 | 2051.7 | lemon yellow; Biaxial (-) refractive index: nα = 1.646 nβ = 1.765(5) nγ = 1.815(5) 2V: 62° Max Birefringence: δ = 0.169 | [16] | ||
Wiklundite | Pb2(Mn2+,Zn)3(Fe3+,Mn2+)2(Mn2+,Mg)19(As3+O3)2[(Si,As5+)O4]6(OH)18Cl6 | hexagonal | ? RШаблон:Overbarc | a = 8.257 c = 126.59 Z = 6 | 7474 | 4.072 | dark reddish brown | [17] | |
Bi8O6(AsO3)2(AsO4)2 | monoclinic | I2/a | a=24.372 b=5.528 c=29.90 β=99.058 Z=8 | 3978 | 7.652 | colourless | [18] | ||
Th(AsIII4AsV4O18) | 1:1 | monoclinic | C2/c | a=18.2148 b 5.19792 c=17.3588 β=99.1298 Z=4 | 1622.70 | 4.582 | colourless | [19] |
References
- ↑ Шаблон:Cite journal
- ↑ Шаблон:Cite journal
- ↑ Шаблон:Cite journal
- ↑ Шаблон:Cite journal
- ↑ Шаблон:Cite journal
- ↑ Шаблон:Cite web
- ↑ Шаблон:Cite web
- ↑ Шаблон:Cite journal
- ↑ Шаблон:Cite web
- ↑ Шаблон:Cite web
- ↑ Шаблон:Cite journal
- ↑ Шаблон:Cite web
- ↑ Шаблон:Cite web
- ↑ Шаблон:Cite web
- ↑ Шаблон:Cite web
- ↑ Шаблон:Cite journal
- ↑ Шаблон:Cite journal
- ↑ Шаблон:Cite journal
- ↑ Шаблон:Cite journal