Multiferroic magnetoelectric fluorides: why are there so many magnetic ferroelectrics?

We review work on multiferroic magnetic fluorides with an aim to correct the popular opinion that magnetic ferroelectrics are rare in nature. After a qualitative summary describing the main families of magnetic fluorides that are piezoelectric and probably ferroelectric, we discuss in detail the most popular recent groups, namely the K3Fe5F15 and Pb5Cr3F19 families.

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