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Litiumsulfaat

Eienskappe

Algemeen

Naam Litiumsulfaat
Struktuurformule van
Struktuurformule van
Chemiese formule Li2SO4
Molêre massa 106,02 [g/mol][1]
CAS-nommer 10377-48-7[1]  
Voorkoms wit vastestof[1]  
Reuk reukloos[1]
Fasegedrag  
Fase β-Li2SO4 
Selkonstantes a=823,9(1)pm; 495,4(1)pm; 847,4(1)pm[2]  
Ruimtegroep P21/a 
Nommer 14  
Fase α-Li2SO4: T>572 °C 
Selkonstantes a=707pm[3]  
Ruimtegroep Fm3m (?) 
Nommer 225
Smeltpunt 860 °C[1]
Kookpunt
Digtheid 2,21 @20°C[1]
Oplosbaarheid

Suur-basis eienskappe

pKa

Veiligheid

Flitspunt  
LD50 613 [mg/kg] (oraal; rot)

Tensy anders vermeld is alle data vir standaardtemperatuur en -druk toestande.

 
Portaal Chemie

Litiumsulfaat is 'n sout van litium en swaelsuur met die formule Li2SO4.

Dit vorm 'n monohidraat Li2SO4·H2O.

Kristalstruktuur

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Li2SO4 bestaan ​​as 'n dimorf, met 'n laetemperatuurfase wat β-Li2SO4 genoem word en 'n hoëtemperatuurfase α-Li2SO4, wat stabiel is tot 1.133 K, die smeltpunt. Watervrye β-Li2SO4 kristalliseer in die monokliniese kristalstelsel. Bo 845 K ondergaan die struktuur 'n fase-oorgang na 'n hoogsimmetriese vlakgesentreerde kubiese fase. Die hoëtemperatuurfase is 'n superioniese geleier.[4] Die hoë kubiese simmetrie betref soos by baie superioniese geleiers die gemiddelde struktuur en is die gevolg van wanorde in die rotasies van (steeds tetraëdriese) sulfaatione en 'n wanordelike verdeling van die litiumione oor 'n groot verskeidenheid van posisies in die rooster. Dit vergemaklik die bewegings van ione deur die vastestof en verhoog die ioniese geleidingsvermoë.

Gebruike

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Litiumsulfaat-tipe materiale is aantreklike kandidate as vaste elektroliete vir verskeie elektrochemiese toestelle. Dunne lagies van hierdie tipe materiale kan amper amorf wees en reeds by lae temperatuur superioniese geleiding vertoon.[4]

Verwysings

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  1. 1,0 1,1 1,2 1,3 1,4 1,5 "SDS". Sigma-Aldrich.
  2. A.G. Nord (1976). "Crystal structure of beta-Li2SO4". Acta Cryst. B32: 982. doi:10.1107/S0567740876004433.
  3. T. Förland (1957). "The structure of the high-temperature modification of sodium lithium sulfate". Acta Cryst. 11: 224.
  4. 4,0 4,1 Sony Varghese, K. Hariharan (2023). "Thin films of solid electrolyte lithium sulfate deposited by e-beam evaporation". Materials Today: Proceedings. doi:10.1016/j.matpr.2023.02.328.((cite journal)): AS1-onderhoud: gebruik authors-parameter (link)
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Litiumsulfaat
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