Oxyphosphides are chemical compounds formally containing the group PO, with one
phosphorus
Phosphorus is a chemical element with the symbol P and atomic number 15. Elemental phosphorus exists in two major forms, white phosphorus and red phosphorus, but because it is highly reactive, phosphorus is never found as a free element on Ear ...
and one
oxygen
Oxygen is the chemical element with the symbol O and atomic number 8. It is a member of the chalcogen group in the periodic table, a highly reactive nonmetal, and an oxidizing agent that readily forms oxides with most elements as wel ...
atom. The phosphorus and oxygen are not bound together as in
phosphate
In chemistry, a phosphate is an anion, salt, functional group or ester derived from a phosphoric acid. It most commonly means orthophosphate, a derivative of orthophosphoric acid .
The phosphate or orthophosphate ion is derived from phospho ...
s or
phosphine oxide
Phosphine oxides are phosphorus compounds with the formula OPX3. When X = alkyl or aryl, these are organophosphine oxides. Triphenylphosphine oxide is an example. An inorganic phosphine oxide is phosphoryl chloride (POCl3).
Structure and bonding ...
s, instead they are bound separately to the cations (metals), and could be considered as a mixed
phosphide-
oxide
An oxide () is a chemical compound that contains at least one oxygen atom and one other element in its chemical formula. "Oxide" itself is the dianion of oxygen, an O2– (molecular) ion. with oxygen in the oxidation state of −2. Most of the E ...
compound. So a compound with O
mP
n requires
cation
An ion () is an atom or molecule with a net electrical charge.
The charge of an electron is considered to be negative by convention and this charge is equal and opposite to the charge of a proton, which is considered to be positive by convent ...
s 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
actinide
The actinide () or actinoid () series encompasses the 15 metallic chemical elements with atomic numbers from 89 to 103, actinium through lawrencium. The actinide series derives its name from the first element in the series, actinium. The inform ...
s. They are in the category of oxy-pnictide compounds.
Many compounds are layered, containing two metals with the formula XZPO, with an XP layer alternating with a ZO layer.
Examples
Examples include
*Ca
4P
2O greenish gold, has space group ''I''4''mmm'' Z=2 and unit cell parameters a = 4.492, c = 15.087.
*Uranium–Copper Oxyphosphide UCuPO semimetallic antiferromagnetic tetragonal ZrCuSiAs-type a =3:7958 c=8:2456 V=118.80 Z=2 MW=348.55 density=9.743
*Thorium–Copper Oxyphosphide ThCuPO semimetallic tetragonal ZrCuSiAs-type a=3.8995 c=8.2939 V=126.12 Z=2 MW=342.56 density=9.02.
*NpCuOP
*Sr
2ScCoPO
3 high
thermoelectric
The thermoelectric effect is the direct conversion of temperature differences to electric voltage and vice versa via a thermocouple. A thermoelectric device creates a voltage when there is a different temperature on each side. Conversely, when ...
effect
[ has layers of CoP alternating with Sr2ScO3.]
*Sr
2ScFePO
3 superconducting 17K.
[
*LaNiOP Lanthanum nickel oxyphosphide
*YOFeP][
*YOCdP][
*ROTPn (R = La, Nd, Sm, Gd; T = Mn, Fe, Co, Ni, Cu; Pn = P, As, Sb)
*YZnPO transparent red ''R'm'' Z=6 a = 3.946, c = 30.71][
*DyZnPO transparent red ''R'm'' Z=6 a=3.8933 c=30.305][
*PrZnPO transparent red dimorphic ][
*SmZnPO transparent red ''R'm'' Z=6 a = 3.946, c = 30.71][
*NdZnPO transparent a = 3.885 c = 30.32][
*GdZnPO transparent red ''R'm'' Z=6 a=3.922, c = 30.56][
*CeZnPO transparent][
*HoZnPO transparent dark red][
*CeRuPO ferromagnetic below 15K. dimorphic][
*CeOsPO antiferromagnetic][
]
related phosphide oxides
*La2AuP2O C2/m, a=15.373 b=4.274 c=10.092 β=131.02 V=500.3 dark-red-violet
Oxy-pnictides
Related compounds are the oxybismuthides
References
{{Phosphides
Phosphides
Oxides