Investigation into the ability of langbeinite-type K2M2(SO4)3 (M = Mn, Fe, Co and Ni) materials to accommodate Na: The importance of the electronegativity of the framework cation

Abstract

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Manganese‐based polyanionic cathodes for sodium‐ion batteries

“…As for other materials such as Na 2 Mn 3 (SO 4 ) 4 [128,129] , Na x Fe 0.5 Mn 0.5 (SO 4 ) 2 [130] , Na 2+d Mn 2−d/2 (SO 4 ) 3 [131,132] , Na 2.44 Mn 1.79 (SO 4 ) 3 [133] , Na 2 Mn(SO 4 ) 2 •nH 2 O [134] , K 0.5 Na 1.5 Mn 1.5 Mg 0.5 (SO 4 ) 3 [135] , and so on, they are still only available at the level of theoretical studies or experimental synthesis. Generally, sulfates can be synthesized below 450°C by low-temperature solid-state, ionothermal or solution processes.…”

Науково-Політичні Та Комунікативні Аспекти Вирішення Екологічних Проблем (На Прикладі Поводження З Відходами)

“…Спротив місцевого населення будівництву нових потенційно шкідливих і небезпечних виробництв характеризують як феномен «не на моєму подвір'ї», або феномен NIMBY (абревіатура від англійського «Not-In-My-BackYard»), чи синдром NIMBY [6]. Дослідження феномена NIMBY як активного спротиву місцевих громад зовнішнім втручанням під гаслами «не на моєму подвір'ї» та організованого руху за право на чисте і безпечне довкілля в Західній Європі та США на хвилі загального підйому екологічної свідомості та активізму починаючи 1970-ми роками важливе для комплексного розуміння шляхів розв'язання проблеми поводження з відходами.…”

Assessing the Novel Mixed Tutton Salts K2Mn0.03Ni0.97(SO4)2(H2O)6 and K2Mn0.18Cu0.82(SO4)2(H2O)6 for Thermochemical Heat Storage Applications: An Experimental–Theoretical Study

“…In recent years, a diversity of hydrate and anhydrous double salts based on metal sulfates have been synthesized and investigated due to their structural, thermal, and optical properties, promising for use in electrochemical, thermochemical, and optics devices [1][2][3][4][5]. Inorganic crystalline structures, such as langbeinite [6], kröhnkite [7], leonite [8], picromerite [9], blödite [10], alluaudite [11], and vanthoffite [12], are the main classes of materials studied for these purposes because of their composition and structural and chemical stability.…”

“…Even with such variability in terms of chemical elements and concentrations, picromerites tend to crystallize in a monoclinic symmetry of space group P2 1 /a, with two formulas per unit cell (Z = 2) [16,17]. These types of double salts have a general chemical formula of M I 2 M II (XO 4 ) 2 (H 2 O) 6 , where M I is a monovalent cation (Cs + , K + , Rb + , Tl + , and NH 4 + ); site M II is occupied by a bivalent cation (Mg 2+ , V 2+ , Mn 2+ , Fe 2+ , Co 2+ , Ni 2+ , Cu 2+ , Zn 2+ , and Cd 2+ ); and X are elements in high oxidation states, such as Se and S [18,19]. The M II aquo-cation is hexacoordinated in the unit cell, forming a complex with slightly distorted octahedral geometry [20].…”