The La0.7Ca0.3−xBaxMnO3 (x=0; 0.03; 0.06…0.3) and La0.7Ca0.3−xSrxMnO3 (x=0.105, 0.12, 0.135, 0.15, 0.165, and 0.18) lanthanum manganites were synthesized and studied. The Curie temperature TC of Ba range showed a sharp change near the concentration structural orthorhombic–rhombohedral phase transition. The TC values for that range are under the “classical” ferromagnetic–paramagnetic line. The TC temperatures of Sr range of samples are independent on x value at the vicinity of structural transition in the rhombohedral phase. Temperature dependence of magnetization of the La0.7Ca0.165Sr0.135MnO3 composition looks like a two-step curve which is caused by the closeness of ferromagnetic ordering and structural phase transition temperatures.
The ferroelastic phase in hydrogen-bonded TlH2PO4 was investigated by means of impedance spectroscopy. The high-temperature dielectric susceptibility revealed the corresponding Curie-Weiss temperature to be far above the antiferroelectric phase transition temperature, and a phase boundary has been identified and confirmed by the distinct electric field dependencies of the polarization.
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