Oxyarsenides Explained
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 |
|---|
| 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 | | | | |
| 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 | | | | |
| Sr2MnZn2As2O2 | | | | | a=4.12624 c=18.6709
| | | | |
| YFeAsO | yttrium iron oxyarsenide | | tetragonal | | | | ferromagnetic 62K | | [7] |
| Ba2Ti2OAs2Cr2As2 | | | tetragonal | I4/nmm | a=4.0391 c=27.8474 | | | | [8] |
| Ba2Ti2Fe2As4O | | | tetragonal | I4/nmm | | | | superconductor | |
| 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 | | | | |
| LaMnAsO | | | | | | | | | [11] |
| LaCoAsO | | | | | | | | | |
| LaFeAsO1−xFx | fluorine doped Lanthanum iron oxyarsenide | | tetragonal | | | | | 26K | |
| LaNiOAs | Lanthanum Nickel oxyarsenide | | tetragonal | P4/nmm | | metallic | | 2.4 | [12] |
| PrFeAsO | Praseodymium iron oxyarsenide | | | | | | | | |
| NdMnAsO | | | | | | | | | [13] [14] |
| NdMnAsO0.95F0.05 | | | | | a=4.04870 c=8.89654 | | | | [15] |
| NdFeAsO | Neodymium iron oxyarsenide | | | | | | | | |
| Nd0.9Sr0.1MsAsO | | | | | | | | | |
| SmFeAsO0.9F0.1 | Samarium iron oxyarsenide | | tetragonal | | | | | 55K | |
| TbFeAsO | Terbium iron oxyarsenide | | tetragonal | | | | | superconducting | |
| TbFeAsO0.85 | | | tetragonal | | a = 3.889 Å b = 8.376 | | | 42 | |
| 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 | | | |
| DyRuAsO | dysprosium ruthenium arsenide oxide | 354.49 | orthorhombic | | a=4.02033 b=4.00791 c=8.0048 V=128.983 Z=2 | | at 12K | | |
| Gd0.8Th0.2FeAsO | thorium doped gadolinium iron oxyarsenide | | tetragonal | | | | | 55K | |
| U2Cu2As3O | diuranium dicopper oxytriarsenide | | | P4/nmm | a = 3.9111 Å c = 17.916 Z=2 | | | | [17] | |
Related
Related compounds include the oxynitrides, oxyphosphides, oxyantimonides and oxybismuthides.
Notes and References
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- Sheath . Bradley C. . Xu . Xiaoyu . Manuel . Pascal . Hadermann . Joke . Batuk . Maria . O’Sullivan . John . Bonilla . Ruy S. . Clarke . Simon J. . 2022-08-08 . Structures and Magnetic Ordering in Layered Cr Oxide Arsenides Sr 2 CrO 2 Cr 2 OAs 2 and Sr 2 CrO 3 CrAs . Inorganic Chemistry . en . 61 . 31 . 12373–12385 . 10.1021/acs.inorgchem.2c01773 . 0020-1669 . 9364410 . 35895504.
- 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. en. 13. 3. 973–980. 10.1021/cm000743j. 0897-4756.
- Arah . Bor . Ritter . Clemens . Stenning . Gavin B. G. . Mclaughlin . Abbie C. . 2022-08-04 . Magnetic Phase Separation in the Oxypnictide Sr 2 Cr 1.85 Mn 1.15 As 2 O 2 . Inorganic Chemistry . 61 . 32 . en . 12518–12525 . 10.1021/acs.inorgchem.2c00885 . 35926167 . 9387525 . 2164/19321 . 0020-1669.
- Tegel . M. . Hummel . F. . Su . Y. . Chatterji . T. . Brunelli . M. . Johrendt . D. . 2010-02-01 . Non-stoichometry and the magnetic structure of Sr 2 CrO 3 FeAs . EPL (Europhysics Letters) . 89 . 3 . 37006 . 10.1209/0295-5075/89/37006 . 0911.0450 . 119218614 . 0295-5075.
- Sheath . Bradley C. . Xu . Xiaoyu . Manuel . Pascal . Hadermann . Joke . Batuk . Maria . O’Sullivan . John . Bonilla . Ruy S. . Clarke . Simon J. . 2022-08-08 . Structures and Magnetic Ordering in Layered Cr Oxide Arsenides Sr 2 CrO 2 Cr 2 OAs 2 and Sr 2 CrO 3 CrAs . Inorganic Chemistry . en . 61 . 31 . 12373–12385 . 10.1021/acs.inorgchem.2c01773 . 0020-1669 . 9364410 . 35895504.
- Chong . S. V. . Mochiji . T. . Kadowaki . K. . Superconductivity in Yttrium Iron Oxyarsenide System . Journal of Physics: Conference Series . 1 March 2009 . 150 . 5 . 052036 . 10.1088/1742-6596/150/5/052036 . 0808.0288 . 1742-6588. 2009JPhCS.150e2036C . 119236068 .
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- Wang . X F . Yan . Y J . Ying . J J . Li . Q J . Zhang . M . Xu . N . Chen . X H . 2010-02-24 . Structure and physical properties for a new layered pnictide-oxide: BaTi 2 As 2 O . Journal of Physics: Condensed Matter . 22 . 7 . 075702 . 10.1088/0953-8984/22/7/075702 . 21386395 . 11013090 . 0953-8984.
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- Kaczorowski. D.. Potel. M.. Noël. H.. October 1994. Crystal Structure of the First Uranium Oxyarsenide U2Cu2As3O. Journal of Solid State Chemistry. en. 112. 2. 228–231. 10.1006/jssc.1994.1296. 1994JSSCh.112..228K.
