How to selectively dissolve MgO

Hello all,
I have some metallic particle (Fe) deposited on MgO substrate. Now I want to remove the thick MgO substrate by selectively dissolving, which means the
metallic particle as reactive as Fe should be kept intact. Is there any hint?
Or any other way of selective removing?
Thanks.
Luyang Han
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have you tried knovel.com?
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