Nickel forms a series of mixed oxide compounds which are commonly called nickelates.
A nickelate is an anion containing nickel or a salt containing a nickelate anion, or a double compound containing nickel bound to oxygen and other elements. Nickel can be in different or even mixed oxidation states, ranging from +1, +2, +3 to +4. The anions can contain a single nickel ion, or multiple to form a cluster ion. The solid mixed oxide compounds are often ceramics, but can also be metallic. They have a variety of electrical and magnetic properties. Rare-earth elements form a range of perovskite nickelates, in which the properties vary systematically as the rare-earth element changes. Fine tuning of properties is achievable with mixtures of elements, applying stress or pressure, or varying the physical form.
The lithium nickelates are of interest to researchers as cathodes in lithium cells, as these substance can hold a variable amount of lithium, with the nickel varying in oxidation state.[1]
Rare-earth nickelates
Rare-earth nickelates with nickel in a +1 oxidation state have an electronic configuration to same as for cuprates and so are of interest to high-temperature superconductor researchers. Other rare-earth nickelates can function as fuel cell catalysts. The ability to switch between an insulating and a conducting state in some of these materials is of interest in the development of new transistors, that have higher on to off current ratios.[2]
The rare-earth nickelates were first made by Demazeau et al. in 1971, by heating a mixture of oxides under high pressure oxygen, or potassium perchlorate. However they were unable to make the cerium, praseodymium, and terbium nickelates.[3] This may be because Ce, Pr and Tb oxidises to 4+ions in those conditions.[4] For two decades after that no one paid attention to them.[4] Many rare-earth nickelates have the Ruddlesden–Popper phase structure.
List of oxides
formula
name
other names
structure
Remarks
references
LiNiO2
lithium nickelate
rhombohedral a = 2.88 Å, c = 14.2 Å, density = 4.78 / 4.81
^Demazeau, Gérard; Marbeuf, Alain; Pouchard, Michel; Hagenmuller, Paul (November 1971). "Sur une série de composés oxygènes du nickel trivalent derivés de la perovskite". Journal of Solid State Chemistry (in French). 3 (4): 582–589. Bibcode:1971JSSCh...3..582D. doi:10.1016/0022-4596(71)90105-8.
^ abAlonso, J. A.; Martínez Lope, M. J.; Casais, M. T.; Martínez, J. L.; Demazeau, G.; Largeteau, A.; García Muñoz, J. L.; Muñoz, A.; Fernández-Díaz, M. T. (September 1999). "High-Pressure Preparation, Crystal Structure, Magnetic Properties, and Phase Transitions in GdNiO3 and DyNiO3 Perovskites". Chemistry of Materials. 11 (9): 2463–2469. doi:10.1021/cm991033k.
^ abcDyer, Lawrence D.; Borie, Bernard S.; Smith, G. Pedro (March 1954). "Alkali Metal-Nickel Oxides of the Type MNiO2". Journal of the American Chemical Society. 76 (6): 1499–1503. doi:10.1021/ja01635a012.
^Komath, M.; Cherian, K. A.; Kulkarni, S. K.; Ray, A. (1994). "The role of sodium nickelate in the metastable recrystallization of diamond". Diamond and Related Materials. 4 (1): 20–25. Bibcode:1994DRM.....4...20K. doi:10.1016/0925-9635(94)90064-7.
^García Muñoz, J. L.; Amboage, M.; Hanfland, M.; Alonso, J. A.; Martínez Lope, M. J.; Mortimer, R. (March 2003). "Pressure-induced melting of charge-order in the self-doped mott insulator yttrium nickelate". High Pressure Research. 23 (1–2): 171–175. Bibcode:2003HPR....23..171G. doi:10.1080/0895795031000114430. S2CID94841772.
^ abcdAlonso, J. A.; Rasines, I.; Rodriguez-Carvajal, J.; Torrance, J. B. (April 1994). "Hole and Electron Doping of R2BaNiO5 (R = Rare Earths)". Journal of Solid State Chemistry. 109 (2): 231–240. Bibcode:1994JSSCh.109..231A. doi:10.1006/jssc.1994.1098.
^ abSörgel, Timo; Jansen, Martin (November 2005). "Eine neue, hexagonale Modifikation von AgNiO2" [A New Hexagonal Modification of AgNiO2]. Zeitschrift für Anorganische und Allgemeine Chemie (in German). 631 (15): 2970–2972. doi:10.1002/zaac.200500295.
^Sörgel, Timo; Jansen, Martin (January 2007). "Ag3Ni2O4—A new stage-2 intercalation compound of 2H–AgNiO2 and physical properties of 2H–AgNiO2 above ambient temperature". Journal of Solid State Chemistry. 180 (1): 8–15. Bibcode:2007JSSCh.180....8S. doi:10.1016/j.jssc.2006.08.033. available on ScienceDirect
^ abcLander, J. J. (1 March 1951). "The crystal structures of NiO·3BaO, NiO·BaO, BaNiO3 and intermediate phases with composition near Ba2Ni2O5; with a note on NiO". Acta Crystallographica. 4 (2): 148–156. doi:10.1107/S0365110X51000441.
^ abLander, J. J.; Wooten, L. A. (June 1951). "Barium-Nickel Oxides with Tri- and Tetravalent Nickel". Journal of the American Chemical Society. 73 (6): 2452–2454. doi:10.1021/ja01150a013.
^Crespin, M.; Isnard, O.; Dubois, F.; Choisnet, J.; Odier, P. (April 2005). "LaNiO2: Synthesis and structural characterization". Journal of Solid State Chemistry. 178 (4): 1326–1334. Bibcode:2005JSSCh.178.1326C. doi:10.1016/j.jssc.2005.01.023.
^ abcdefghPoltavets, Viktor V.; Lokshin, Konstantin A.; Dikmen, Sibel; Croft, Mark; Egami, Takeshi; Greenblatt, Martha (July 2006). "La2Ni2O6: A New Double T′-type Nickelate with Infinite Ni1+/2+O2 Layers". Journal of the American Chemical Society. 128 (28): 9050–9051. doi:10.1021/ja063031o. PMID16834375.
^Sreedhar, K.; Rao, C. N. R. (October 1990). "Electrical and magnetic properties of La2−xSrxNiO4: A tentative phase diagram". Materials Research Bulletin. 25 (10): 1235–1242. doi:10.1016/0025-5408(90)90079-H.
^García-Muñoz, J. L.; Aranda, M. A. G.; Alonso, J. A.; Martínez-Lope, M. J. (28 April 2009). "Structure and charge order in the antiferromagnetic band-insulating phase of NdNiO3". Physical Review B. 79 (13): 134432. Bibcode:2009PhRvB..79m4432G. doi:10.1103/PhysRevB.79.134432.
^Alonso, J. A.; Amador, J.; Rasines, I.; Soubeyroux, J. L. (15 February 1991). "Er2BaNiO5: structure refinement using neutron powder diffraction data". Acta Crystallographica Section C. 47 (2): 249–251. doi:10.1107/S0108270190008873.
^Kim, Seung-Joo; Demazeau, Gérard; Alonso, José A.; Choy, Jin-Ho (2001). "High pressure synthesis and crystal structure of a new Ni(III) perovskite: TlNiO3". Journal of Materials Chemistry. 11 (2): 487–492. doi:10.1039/b007043m.
^Ishiwata, Shintaro; Azuma, Masaki; Takano, Mikio; Nishibori, Eiji; Takata, Masaki; Sakata, Makoto; Kato, Kenichi (29 November 2002). "High pressure synthesis, crystal structure and physical properties of a new Ni(II) perovskite BiNiO3". Journal of Materials Chemistry. 12 (12): 3733–3737. doi:10.1039/b206022a.
^Pugaczowa-Michalska, M.; Kaczkowski, J. (January 2017). "DFT+U studies of triclinic phase of BiNiO3 and La-substituted BiNiO3". Computational Materials Science. 126: 407–417. doi:10.1016/j.commatsci.2016.10.014.
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