Ferroelectric--paraelectric phase transitions with no group--supergroup relation between the space groups of both phases?

Kroumova E; Aroyo MI; Perez-Mato JM; Hundt R

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Ferroelectric--paraelectric phase transitions with no group--supergroup relation between the space groups of both phases?

机译：两相空间群之间没有基团-超群关系的铁电-顺电相变？

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The structures of Sr(3)(FeF(6))(2), beta-NbO(2), TlBO(2) and CrOF(3), previously reported as possible ferroelectrics with no group-supergroup relation between the ferroelectric and the paraelectric symmetries, have been carefully studied. We could not confirm any structural pseudosymmetry with respect to a space group which is not a supergroup of their room-temperature polar space group. In all cases, pseudosymmetry was indeed detected, but only for non-polar supergroups of the actual space groups of the structures. In this sense, the four compounds are possible ferroelectrics, but fulfilling the usual group-supergroup relation between the phase symmetries.

机译：Sr（3）（FeF（6））（2），β-NbO（2），TlBO（2）和CrOF（3）的结构先前被报道为可能的铁电体，在铁电体与铁氧体之间没有基团-超基团关系顺电对称性，已被仔细研究。我们无法确认相对于不是其室温极性空间群的超群的空间群的任何结构假对称性。在所有情况下，确实都检测到了伪对称性，但仅针对结构实际空间组的非极性超组。从这个意义上讲，这四种化合物可能是铁电体，但满足了相对称性之间通常的基团-超基团关系。

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《Acta Crystallographica, Section B. Structural Science》 |2001年第4期|共3页
作者
Kroumova E; Aroyo MI; Perez-Mato JM; Hundt R;
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正文语种 eng
中图分类晶体学;
关键词
polar; respect; Temperature; 温度;

机译：polar;respect;Temperature;温度;

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1. Ferroelectric--paraelectric phase transitions with no group--supergroup relation between the space groups of both phases? [J] . Kroumova E, Aroyo MI, Perez-Mato JM, Acta Crystallographica, Section B. Structural Science . 2001,第4期

机译：两相空间群之间没有基团-超群关系的铁电-顺电相变？
2. Compositionally induced phase transitions and symmetry relations between space groups in the layered system FeIn_(1-x)Y_xGe_2O_7 [J] . Rosario Moreno-Tovar, Lauro Bucio, Ivonne Rosales, Acta Crystallographica, Section B. Structural science, crystal engineering and materials . 2018,第4期

机译：分层系统中的空间组之间的组成诱导的相变和对称性关系FEIN_（1-x）Y_XGE_2O_7
3. Boundary-induced phase transitions in a space-continuous traffic model with non-unique flow-density relation [J] . A. Namazi, N. Eissfeldt, P. Wagner, The European physical journal, B. Condensed matter physics . 2002,第4期

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Ferroelectric--paraelectric phase transitions with no group--supergroup relation between the space groups of both phases?

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