Oxyarsenides

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
formula name mw structure space group cell appearance properties supercondicting Tc reference
YFeAsO yttrium iron oxyarsenide tetragonal ferromagnetic 62K [2]
Gd0.8Th0.2FeAsO thorium doped gadolinium iron oxyarsenide tetragonal 55K [2]
SmFeAsO0.9F0.1 Samarium iron oxyarsenide tetragonal 55K [2]
LaFeAsO1-xFx fluorine doped Lanthanum iron oxyarsenide tetragonal 26K [2]
TbFeAsO Terbium iron oxyarsenide tetragonal superconducting [2]
PrFeAsO Praseodymium iron oxyarsenide [1]
NdFeAsO Neodymium iron oxyarsenide [1]
TbFeAsO0.85 tetragonal a = 3.889 Å b = 8.376 42 [1]
U2Cu2As3O diuranium dicopper oxytriarsenide P4/nmm a = 3.9111 Å c = 17.916 Z=2 [3]
TbRuAsO terbium ruthenium arsenide oxide 350.95 tetragonal P4/nmm a= 4.0254 c=8.0710 V=130.782 Z=2 grey [4]
DyRuAsO dysprosium ruthenium arsenide oxide 354.49 tetragonal P4/nmm a=4.01728 c=8.03272 V=129.637 Z=2 grey [4]
DyRuAsO dysprosium ruthenium arsenide oxide 354.49 orthorhombic a=4.02033 b=4.00791 c=8.0048 V=128.983 Z=2 at 12K [4]
LaMnAsO [5]
LaCoAsO [5]
NdMnAsO [6]
Nd0.9Sr0.1MsAsO [6]
LaNiOAs Lanthanum Nickel oxyarsenide tetragonal P4/nmm metallic 2.4 [7]
NdMnAsO
BaTi2As2O density wave at 200K [8]
Sr2Mn3As2O2 a=4.1459 c=18.856
 [9]
Sr2MnZn2As2O2 a=4.12624 c=18.6709
 [9]
Ba2MnZn2As2O2 tetragonal P4/nmm a=4.23369 c=19.5087 [9]

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

References
  1. Shi, Y. G.; Yu, S.; Belik, A. A.; Matsushita, Y.; Tanaka, M.; Katsuya, Y.; Kobayashi, K.; Yamaura, K.; Takayama-Muromachi, E. (2008-08-14). "Synthesis and superconducting properties of the iron oxyarsenide TbFeAsO0.85". arXiv:0808.1948 [cond-mat.supr-con].
  2. Chong, S. V.; Mochiji, T.; Kadowaki, K. (1 March 2009). "Superconductivity in Yttrium Iron Oxyarsenide System". Journal of Physics: Conference Series. 150 (5): 052036. arXiv:0808.0288. Bibcode:2009JPhCS.150e2036C. doi:10.1088/1742-6596/150/5/052036. ISSN 1742-6588. S2CID 119236068.
  3. Kaczorowski, D.; Potel, M.; Noël, H. (October 1994). "Crystal Structure of the First Uranium Oxyarsenide U2Cu2As3O". Journal of Solid State Chemistry. 112 (2): 228–231. Bibcode:1994JSSCh.112..228K. doi:10.1006/jssc.1994.1296.
  4. McGuire, Michael A.; May, Andrew F.; Sales, Brian C. (2012-08-06). "Crystallographic and Magnetic Phase Transitions in the Layered Ruthenium Oxyarsenides TbRuAsO and DyRuAsO". Inorganic Chemistry. 51 (15): 8502–8508. doi:10.1021/ic3010695. ISSN 0020-1669. PMID 22835000.
  5. Otsuka, Shintaro; Onizawa, Manami; Kato, Koma; Hiramoto, Shozo; Yoshida, Fumiko; Moriyoshi, Chikako; Watanabe, Tadataka; Takano, Yoshiki; Kuroiwa, Yoshihiro; Takase, Kouichi (April 2011). "Thermal Expansion of Oxyarsenides (LaO)TAs; T = Transition Metal". Solid State Phenomena. 170: 131–134. doi:10.4028/www.scientific.net/SSP.170.131. ISSN 1662-9779. S2CID 98750630.
  6. Wildman, E. J.; Emery, N.; Mclaughlin, A. C. (2014-12-08). "Electronic and magnetic properties of Nd 1 − x Sr x MnAsO oxyarsenides". Physical Review B. 90 (22): 224413. arXiv:1501.02996. Bibcode:2014PhRvB..90v4413W. doi:10.1103/PhysRevB.90.224413. ISSN 1098-0121. S2CID 119285076.
  7. Watanabe, Takumi; Yanagi, Hiroshi; Kamihara, Yoichi; Kamiya, Toshio; Hirano, Masahiro; Hosono, Hideo (August 2008). "Nickel-based layered superconductor, LaNiOAs". Journal of Solid State Chemistry. 181 (8): 2117–2120. arXiv:0805.4340. Bibcode:2008JSSCh.181.2117W. doi:10.1016/j.jssc.2008.04.033. S2CID 97227280.
  8. Hosono, Hideo; Tanabe, Keiichi; Takayama-Muromachi, Eiji; Kageyama, Hiroshi; Yamanaka, Shoji; Kumakura, Hiroaki; Nohara, Minoru; Hiramatsu, Hidenori; Fujitsu, Satoru (2015-05-08). "Exploration of new superconductors and functional materials, and fabrication of superconducting tapes and wires of iron pnictides". Science and Technology of Advanced Materials. 16 (3): 033503. arXiv:1505.02240. Bibcode:2015STAdM..16c3503H. doi:10.1088/1468-6996/16/3/033503. ISSN 1468-6996. PMC 5099821. PMID 27877784.
  9. Ozawa, Tadashi C.; Kauzlarich, Susan M.; Bieringer, Mario; Wiebe, Chris R.; Greedan, John E.; Gardner, Jason S. (March 2001). "The Effect of Interlayer Cations on the Magnetic Properties of the Mixed-Metal Pnictide Oxides: A 2 MnZn 2 As 2 O 2 (A = Sr, Ba)". Chemistry of Materials. 13 (3): 973–980. doi:10.1021/cm000743j. ISSN 0897-4756.
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