Editing Prussian blue (section)

===Prussian white===
<!-- As no dedicated page already exists, some preliminary information on the Prussian white is provided here, awaiting to be incorporated in a self-supporting page when there will be sufficient materials gathered to make it. In the meantime, four redirect pages (Prussian white, Berlin white, Everett's salt, and Everitt's salt) already point here to inform the Wikipedia reader. Please, do not remove this section {{Main article|Prussian white}} -->

Prussian white, also known as ''Berlin white'' or ''Everett's salt'', is the [[sodium]] [[end-member]] of the totally [[Redox|reduced]] form of the Prussian blue in which all iron is present as Fe(II). It is a sodium [[hexacyanoferrate]] of Fe(II) of formula {{Chem2|Na2Fe[Fe(CN)6]}}.<ref name="MacsenLabs2023">{{cite web | title=Prussian White | website=Macsen Labs | date=2023-10-28 | url=https://www.macsenlab.com/battery-cathode-materials/prussian-white/ | access-date=2024-03-16}}</ref> Its [[molecular weight]] value is {{Nowrap|314 g/mol}}.<ref name="MacsenLabs2023" />

A more generic formula allowing for the substitution of {{Chem2|Na+}} cations by  {{Chem2|K+}} cations is {{Chem2|A_{(2-x)}B_{x}Fe2(CN)6}} (in which A or B = {{Chem2|Na+}} or {{Chem2|K+}}).

The Prussian white is closely related to the Prussian blue, but it significantly differs by its crystallographic structure, molecular framework pore size, and its color. The cubic sodium Prussian white, {{Chem2|Na_{(2-x)}K_{x}Fe2(CN)6·yH2O}}, and potassium Prussian white, {{Chem2|K_{(2-x)}Na_{x}Fe2(CN)6·yH2O}}, are candidates as [[cathode]] materials for [[Sodium-ion battery|Na-ion batteries]].<ref name="Piernas-Muñoz2016">{{cite journal | last1=Piernas-Muñoz | first1=María José | last2=Castillo-Martínez | first2=Elizabeth | last3=Bondarchuk | first3=Oleksandr | last4=Armand | first4=Michel | last5=Rojo | first5=Teófilo | year=2016 | title=Higher voltage plateau cubic Prussian white for Na-ion batteries | journal=Journal of Power Sources | publisher=Elsevier | volume=324 | pages=766–773 | issn=0378-7753 | doi=10.1016/j.jpowsour.2016.05.050| bibcode=2016JPS...324..766P }}</ref> The insertion of {{Chem2|Na+}} and {{Chem2|K+}} cations in the framework of potassium Prussian white provides favorable synergistic effects improving the long-term battery stability and increasing the number of possible recharge cycles, lengthening its service life.<ref name="Piernas-Muñoz2016" /> The large-size framework of Prussian white easily accommodating {{Chem2|Na+}} and {{Chem2|K+}} cations facilitates their intercalation and subsequent extraction during the charge/discharge cycles. The spacious and rigid host crystal structure contributes to its volumetric stability against the internal swelling [[Stress (mechanics)|stress]] and [[Strain (mechanics)|strain]] developing in sodium-batteries after many cycles.<ref name="MacsenLabs2023" /> The material also offers perspectives of high [[Energy density|energy densities]] (Ah/kg) while providing high recharge rate, even at low temperature.<ref name="MacsenLabs2023" />