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Topic: Is Li2Mg(SO4)2 a possible compound?  (Read 4843 times)

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Offline MinusNick

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Is Li2Mg(SO4)2 a possible compound?
« on: November 28, 2011, 10:47:33 PM »
I know that Loweite exists as Na12Mg7(SO4)13·15(H2O), so I was wondering if a compound with lithium, magnesium, and sulfate existed as well. If it did, would it be just Li2Mg(SO4)2·X(H2O) or something more complex? I've tried searching the web for lithium magnesium sulfate and returned fruitless. Thanks a lot!
« Last Edit: November 29, 2011, 04:40:08 AM by Borek »
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Offline sjb

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Re: Is Li2Mg(SO4)2 a possible compound?
« Reply #1 on: November 29, 2011, 03:11:32 AM »
Quote from: MinusNick on November 28, 2011, 10:47:33 PM
I know that Loweite exists as Na12Mg7(SO4)13·15(H2O), so I was wondering if a compound with lithium, magnesium, and sulfate existed as well. If it did, would it be just Li2Mg(SO4)2·X(H2O) or something more complex? I've tried searching the web for lithium magnesium sulfate and returned fruitless. Thanks a lot!

No reason why this should not exist, perhaps the lithium may be a little too small to fit in the holes snugly. Perhaps it just hasn't been identified as a co-salt or similar?
« Last Edit: November 29, 2011, 04:40:27 AM by Borek »
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Offline AWK

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Re: Is Li2Mg(SO4)2 a possible compound?
« Reply #2 on: November 29, 2011, 03:21:15 AM »
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Offline MinusNick

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Re: Is Li2Mg(SO4)2 a possible compound?
« Reply #3 on: November 30, 2011, 01:56:22 AM »
Thanks a lot sjb. I wasn't even thinking about the relative sizes of the two metals. (And I didn't know a compound like this was called a co-salt either!)

And AWK, thanks for the link! It helps to know there's proof that lithium and magnesium can form a double sulfate salt together.
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Offline MinusNick

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Re: Is Li2Mg(SO4)2 a possible compound?
« Reply #4 on: November 30, 2011, 02:05:49 AM »
Quote from: sjb on November 29, 2011, 03:11:32 AM
No reason why this should not exist, perhaps the lithium may be a little too small to fit in the holes snugly. Perhaps it just hasn't been identified as a co-salt or similar?

Actually wait a minute, the ionic radii of Li+ and Mg2+ are 90pm and 86pm respectively. Aren't they close enough?
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Offline sjb

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Re: Is Li2Mg(SO4)2 a possible compound?
« Reply #5 on: November 30, 2011, 02:35:29 AM »
Quote from: MinusNick on November 30, 2011, 02:05:49 AM
Quote from: sjb on November 29, 2011, 03:11:32 AM
No reason why this should not exist, perhaps the lithium may be a little too small to fit in the holes snugly. Perhaps it just hasn't been identified as a co-salt or similar?

Actually wait a minute, the ionic radii of Li+ and Mg2+ are 90pm and 86pm respectively. Aren't they close enough?

It was just random speculation first thing in the morning, I did not check the figures. Sure, if they are 90 and 86 pm then there's little difference in size. Sorry to have led you up a false path.
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Offline AWK

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Re: Is Li2Mg(SO4)2 a possible compound?
« Reply #6 on: November 30, 2011, 01:06:35 PM »
Se also the phase diagram for system Li2SO4-MgSO4 in
Journal of Thermal Analysis, Vol. 40 (1993) 1151-1156
BINARY SYSTEMS WITH Li2SO4 AS ONE OF THE
COMPONENTS
M. Touboul, E. Le Samedi, N. Sephar, F. Broszniowski, P. Edern
and E. Betourne
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