Oxyarsenides

Class of chemical compounds From Wikipedia, the free encyclopedia

Oxyarsenides or arsenide oxides are chemical compounds formally containing the group AsO, with one arsenic and one oxygen atom. The arsenic and oxygen are not bound together as in arsenates or arsenites, instead they make a separate presence bound to the cations (metals), and could be considered as a mixed arsenide-oxide compound. So a compound with OmAsn requires cations to balance a negative charge of 2m+3n. The cations will have charges of +2 or +3. The trications are often rare earth elements or actinides. They are in the category of oxypnictide compounds.

Some of these compounds are superconductors, but may require doping with fluoride or oxygen deficiency.[1] Yet others undergo colossal magnetoresistance with a lowered electrical resistance in a magnetic field.

Many compounds are layered, containing two metals with the formula XZAsO, with an XAs layer alternating with a ZO layer.

Examples

More information formula, name ...
formula name mw structure space group cell appearance properties supercondicting Tc reference
Sr2Cr3As2O3 tetragonal P4/mmm a=4.04032 c=9.33140 V=152.327 [2]
Sr2Cr2AsO3 tetragonal P4/nmm a=3.90988 c=16.05417 C=245.422 [2]
Sr2Mn3As2O2 a=4.1459 c=18.856
 [3]
Sr2Cr1.85Mn1.15As2O2 tetragonal I4/mmm a = 4.043788 c 18.9977 Z=2 V=310.654 [4]
Sr2CrO3FeAs tetragonal [5]
Sr2CrO3CrAs P4/nmm a=3.90988 c=16.05417 V=245.422 [6]
Sr2CrO2Cr2OAs2 P4/mmm a=4.04032 c=9.33140 V=152.327 [6]
Sr2MnZn2As2O2 a=4.12624 c=18.6709
 [3]
YFeAsO yttrium iron oxyarsenide tetragonal ferromagnetic 62K [7]
Ba2Ti2OAs2Cr2As2 tetragonal I4/nmm a=4.0391 c=27.8474 [8]
Ba2Ti2Fe2As4O tetragonal I4/nmm superconductor [8]
BaTi2As2O tetragonal I4/nmm a = 4.047 c = 7.275 density wave at 200K [9][10]
Ba2MnZn2As2O2 tetragonal P4/nmm a=4.23369 c=19.5087 [3]
LaMnAsO [11]
LaCoAsO [11]
LaFeAsO1−xFx fluorine doped Lanthanum iron oxyarsenide tetragonal 26K [7]
LaNiOAs Lanthanum Nickel oxyarsenide tetragonal P4/nmm metallic 2.4 [12]
PrFeAsO Praseodymium iron oxyarsenide [1]
NdMnAsO [13][14]
NdMnAsO0.95F0.05 a=4.04870 c=8.89654 [15]
NdFeAsO Neodymium iron oxyarsenide [1]
Nd0.9Sr0.1MsAsO [13]
SmFeAsO0.9F0.1 Samarium iron oxyarsenide tetragonal 55K [7]
TbFeAsO Terbium iron oxyarsenide tetragonal superconducting [7]
TbFeAsO0.85 tetragonal a = 3.889 Å b = 8.376 42 [1]
TbRuAsO terbium ruthenium arsenide oxide 350.95 tetragonal P4/nmm a= 4.0254 c=8.0710 V=130.782 Z=2 grey [16]
DyRuAsO dysprosium ruthenium arsenide oxide 354.49 tetragonal P4/nmm a=4.01728 c=8.03272 V=129.637 Z=2 grey [16]
DyRuAsO dysprosium ruthenium arsenide oxide 354.49 orthorhombic a=4.02033 b=4.00791 c=8.0048 V=128.983 Z=2 at 12K [16]
Gd0.8Th0.2FeAsO thorium doped gadolinium iron oxyarsenide tetragonal 55K [7]
U2Cu2As3O diuranium dicopper oxytriarsenide P4/nmm a = 3.9111 Å c = 17.916 Z=2 [17]
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Related

Related compounds include the oxynitrides, oxyphosphides, oxyantimonides and oxybismuthides.

References

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