Effects of hydrostatic pressure on the successive phase transitions in ferroelectric {N(Ch3)4}2 CoCl4 and {N(CH3)4}2ZnCl4

Shimizu, Hiroyasu; Oguri, Akihiro; Abe, N.; Yasuda, Naohiko; Fujimoto, Sanji; Sawada, Shozo; Shiroishi, Y.; Takashige, Masaaki

doi:10.1016/0038-1098(79)91021-4

Cited by 66 publications

(8 citation statements)

References 6 publications

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“…In any case, recent calorimetric measurements support the existence of this new phase transition [14]. Though we have no evidence about the crystallographic structure of the new phase below 92 K, we tentatively suggest that this phase could belong to the orthorhombic P212121 in clear analogy to the phase transitions observed in both (TMA)~COCL, and (TMA)2 ZnC14 crystals of the same family at T = 122 K [6] and T = 161 K [7] respectively, both corresponding to the monoclinic P121/cl~rthorhombic P212121 phase transition.…”

mentioning

confidence: 45%

Self-bunching in an electron beam during passage through a resonantly absorbing medium

Ораевский¹

1980

Sov. J. Quantum Electron.

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A new first-order phase transition at T = 92 K has been detected in single crystals of ((CH,),N) MnCI, by means of several optical techniques. The phase transition displays a large thermal hysteresis, A T = 12 K. Coexistence of phases below 92 K is also detected. The sensitivity of the optical absorption of the crystal, as well as that of emission, excitation and lifetime of MnC$ units for detecting this phase transition is analysed in detail. The results are also compared with those corresponding to the P112,/n-P12,/cl phase transition at T = 171 K.

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confidence: 45%

Self-bunching in an electron beam during passage through a resonantly absorbing medium

Ораевский¹

1980

Sov. J. Quantum Electron.

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“…Though we have no evidence about the crystallographic structure of the new phase below 92 K, we tentatively suggest that this phase could belong to the orthorhombic P212121 in clear analogy to the phase transitions observed in both (TMA)~COCL, and (TMA)2 ZnC14 crystals of the same family at T = 122 K [6] and T = 161 K [7] respectively, both corresponding to the monoclinic P121/cl~rthorhombic P212121 phase transition.…”

mentioning

confidence: 74%

Evidence of a new first-order phase transition at 92 K in ((CH₃)₄N)₂MnCl₄single crystals

Lucas

Rodrı́guez

1989

J. Phys.: Condens. Matter

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“…Leaving appart the copper crystals, the position of the chloride compounds in the common pressure-temperature phase diagram has been related to their unit cell size and specially to the C1-metal bond length [19]. This result suggested that the cell volume reduction as a pressure effect could be compared with the similar result obtained by simply changing the metallic cation.…”

Section: Thermodynamic Behaviourmentioning

confidence: 89%

Thermodynamics of the Phase Transition Sequence in the Incommensurate Compound (N(CH₃)₄)₂CuBr₄

López‐Echarri

Ruiz‐Larrea

Tello

1989

Physica Status Solidi (b)

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The prototype-incommensurate-ferroelectric-ferroelastic phase transition sequence in (N(CH,),), CuBr, is studied by adiabatic calorimetry in the temperature range 60 to 343 K. The thermodynamic function values assigned to the successive phase transformations permit a comparative study with other tetramethylammonium tetrahalogenmetallates. The enthalpies involved in their phase transition sequences can be related to the packing of the crystal unit cell and to the position of each compound in a common pressure-temperature phase diagram. I n the case of (N(CH,),),.CuBr4, this diagram is correctly described by a simple phenomenological model. A brief discussion on the critical exponents associated to the specific heat (CX = a' = 0.01 for I T -TJ < 0.2 K) and to the order parameter, for the prototype-incommensurate phase transition, is also included.La sequence des transitions de phase prototype-incommensurable-ferro6lectrique-ferro6lastique dans le cristal (N(CH,),),CuBr, a 8tB &die par calorim6trie adiabatique dans l'intervalle de temperature 60 B 343 K. Les valeurs des fonctions thermodynamiques associees aux successives transformations de phase ont permis un etude comparatif avec des autres tetram6thylammonium tetrahalogitnmetalates. Les enthalpies associees aux transitions de phase sont relationees avec la densit6 de la maille unit6 aussi bien qu'avec la position de chaque composb dans le diagramme des phases pressure-temperature commun. Dans le cas de (N(CH,),),CuBr,, ce diagramme est decrit convenablement par une moditle phenomenologique trits simple. Une bref discussion sur les exposants critiques associes B la chaleur specifique ( a = a' = 0,Ol) et au paramittre d'ordre dans la transition de phase prototype-incommensurable est aussi present&

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Effects of hydrostatic pressure on the successive phase transitions in ferroelectric {N(Ch3)4}2 CoCl4 and {N(CH3)4}2ZnCl4

Cited by 66 publications

References 6 publications

Self-bunching in an electron beam during passage through a resonantly absorbing medium

Self-bunching in an electron beam during passage through a resonantly absorbing medium

Evidence of a new first-order phase transition at 92 K in ((CH₃)₄N)₂MnCl₄single crystals

Thermodynamics of the Phase Transition Sequence in the Incommensurate Compound (N(CH₃)₄)₂CuBr₄

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Effects of hydrostatic pressure on the successive phase transitions in ferroelectric {N(Ch3)4}2 CoCl4 and {N(CH3)4}2ZnCl4

Cited by 66 publications

References 6 publications

Self-bunching in an electron beam during passage through a resonantly absorbing medium

Self-bunching in an electron beam during passage through a resonantly absorbing medium

Evidence of a new first-order phase transition at 92 K in ((CH3)4N)2MnCl4single crystals

Thermodynamics of the Phase Transition Sequence in the Incommensurate Compound (N(CH3)4)2CuBr4

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Evidence of a new first-order phase transition at 92 K in ((CH₃)₄N)₂MnCl₄single crystals

Thermodynamics of the Phase Transition Sequence in the Incommensurate Compound (N(CH₃)₄)₂CuBr₄