Geodesic
Free energy of a cubic ferroelectric in the ring approximation
Teoretičeskaâ i matematičeskaâ fizika, Tome 60 (1984) no. 3, pp. 476-480

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By summation of ring diagrams the free energies are calculated for the rhombohedral and tetragonal phases of a cubic ferroelectric in the critical region; equations for the binodals and spinodals are obtained, and the jumps in the value of the order parameter at them are found. 
@article{TMF_1984_60_3_a12,
     author = {I. O. Maier},
     title = {Free energy of a cubic ferroelectric in the ring approximation},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {476--480},
     publisher = {mathdoc},
     volume = {60},
     number = {3},
     year = {1984},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1984_60_3_a12/}
}
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I. O. Maier. Free energy of a cubic ferroelectric in the ring approximation. Teoretičeskaâ i matematičeskaâ fizika, Tome 60 (1984) no. 3, pp. 476-480. http://geodesic.mathdoc.fr/item/TMF_1984_60_3_a12/