Hard magnetic strontium hexaferrite SrFe
12
O
19 nanoparticles were synthesized by the sol–gel hydrothermal method. The factors affecting the synthesized process, such as the mole proportion of the reactants, pH, temperature, the hydrothermal conditions and the calcination process, have been investigated. The crystal structures of these materials were refined by Rietveld method. The obtained materials have single crystal phase, equal nano-size, plate shape and high anisotropy. The high magnetic coercivity of 6.3 kOe with the magnetization at 11.1 kOe of 66 emu
g
−1 at room temperature was observed for the strontium hexaferrite nanoparticles. For other nanoparticles (SrLn
x
Fe
12-x
O
19 and SrFe
12
O
19/CoFe
2
O
4) synthesized on the basis of SrFe
12
O
19 the complex completion of the crystal structure distortion and the interaction between magnetic phases were observed.
The dynamical stability and its connection with phase structures of binary Bose–Einstein condensates (BECs) are systematically studied within framework of the Gross–Pitaevskii (GP) theory. We find that (a) the dynamical stability is the main factor governing both the symmetry breaking and the formation of various phases associated with the scenarios: symmetry restoration (SR) and inverse symmetry breaking (ISB); (b) the condensation of Bose gases might occur at constant temperature for chemical potentials varying in some definite regions. We suggest how to experimentally observe the foregoing phenomena whose possible existences in nature are theoretically confirmed.
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