Complex investigations are made (neutron diffraction study, high temperature X‐ray analysis, dielectric measurements at low and superhigh frequency ranges, resonance (ESR and Mössbauer effect) and magnetic measurements) on the known compounds A2BReO6 (A = Ba, Sr; B = Li, Mg, Ca, Mn, Fe, Co, Ni) and under high pressure synthesized compounds Pb2BReO6 (B = Mg, Fe, Co, Ni) with the perovskite‐type structure. The total sum of the results shows the presence of a spontaneously polarized state in the investigated compounds. Seven new seignettomagnets are found.

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A number of compounds with the hexagonal barium titanate structure, namely Ba2FeSbO6 and Ba3Fe2BO9 (B = Re, Te, W, Mo) are studied using neutron diffraction and high‐temperature X‐ray analysis, dielectric measurements at low and superhigh frequencies, electron spin resonance, Mössbauer effect, and magnetic measurements. Results of the study reveal the spontaneously polarized state in these compounds which can be classified as new seignette‐magnets.

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