Thermochromic phase transitions in two aromatic tetrachlorocuprates

Abdel‐Kader, M. M.; Arafat, S. S.; Kandeel, E. M.

doi:10.1088/0031-8949/43/6/016

Cited by 21 publications

(13 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The peak decreases in height as the measuring field increases, with no apparent change in its position. This behavior is typical for first order structural transitions [10,11], as has previously been found in almost all of the structural transitions of the alkylammonium metal complexes studied in our laboratory [6,10,11].…”

Section: Magnetic Susceptibility Resultssupporting

confidence: 81%

Dielectric Dispersion of New Ferroelectric Cobalt Halide Dimers: Bis-ethanolammonium-hexahalocobaltate, (C 2 H 8 NO) 2 Co 2 X 6 , X = CI/Br

Mostafa

Arafat

2000

Zeitschrift Für Naturforschung A

View full text Add to dashboard Cite

The AC conductivity in the frequency range 5.0 Hz -10.0 kHz, the magnetic susceptibility in a field of 14.7 and 17.810 4 A/m, and differential thermal analysis at 78 K up to room temperature for bis-(ethanolammonium)Co 2 X 6 ,X = CI and Br are reported. The bromide dimer undergoes an order-disorder transition at 302 K and a displacive type ferroelectric transition at T ~ 220 K. The chloride dimer shows two transitions, the first being in a displacive ferroelectric one at T ~ 210 K showing critical slowing down. The second phase transition, occuring at 282 K, is found to be inactive in the electric measurements.

show abstract

Section: Magnetic Susceptibility Resultssupporting

confidence: 81%

Dielectric Dispersion of New Ferroelectric Cobalt Halide Dimers: Bis-ethanolammonium-hexahalocobaltate, (C 2 H 8 NO) 2 Co 2 X 6 , X = CI/Br

Mostafa

Arafat

2000

Zeitschrift Für Naturforschung A

View full text Add to dashboard Cite

show abstract

“…Cl hydrogen bond. This is also the case for the similar perovskite-type layer compounds, namely (n-C 12 H 25 NH 3 ) 2 CuCl 4 [7], (p-CH 3 C 6 H 4 NH 3 ) 2 CuCl 4 and (p-ClC 6 H 4 NH 3 ) 2 CuCl 4 [8].…”

Section: Discussionmentioning

confidence: 52%

Phase Transitions in Some Hydrogen-Bonded Molecules

Abdel‐Kader

Gwaily

Zayat

2002

phys. stat. sol. (a)

View full text Add to dashboard Cite

The calorimetric parameters including the heat capacity, thermal conductivity and thermal diffusivity are measured and/or determined as a function of temperature (310 K < T < 400 K) for two hydrogen-bonded molecules, namely anthralinic acid C 6 H 4 COOHNH 2 and p-nitrophenol C 6 H 4 NO 2 OH. It seems likely that the first compound undergoes a structural phase transition around 354 K whereas for the second compound the transition temperature is 336 K. Furthermore, the order of magnitude of the above-mentioned parameters suggests that the two compounds under current investigation behave as poorly conducting materials. The thermogravimetric analysis (TGA) for the two compounds was carried out. An interpretation of our data has been outlined on the basis of the crystal structure including the arrangement of the hydrogen bonding system in each compound.

show abstract

“…Since the main object of our research programme is focused on the electrical and thermal properties as related to the phase transitions, besides to the conduction mechanism of interesting solids in general and in particular the hydrogen-bonded materials [30][31][32][33][34][35]; therefore, we decided to turn our attention to this series of compounds. Recently, some selected members of these long-chain compounds were synthesized in our laboratory.…”

Section: Introductionmentioning

confidence: 99%

Electrical and thermal investigations of energetic material (n-C₁₆H₃₃NH₃)₂CdCl₄

Abdel‐Kader

Aboud

Gamal

2015

Philosophical Magazine

View full text Add to dashboard Cite

The thermal energy storage material, namely hexadecyl ammonium tetrachloro cadmate (n-C 16 H 33 NH 3 ) 2 CdCl 4 , which belongs to the organic-inorganic hybrid layered compounds, was synthesized as an example of long-chain complexes of the series (n-C n H 2n+1 NH 3 ) 2 CdCl 4 (n = 8-18). The ac conductivity σ ac (ω, T) and the complex dielectric permittivity ε*(ω, T) were extensively investigated as a function of both frequency (5-100 kHz) and temperature (100 K < T < 400 K). The general trend of the mentioned parameters indicates that the frequency dependent conductivity behaves according to the power law, namely σ ac (ω, T) α ω s(ω, T) where s is the frequency exponent (0 < s < 1). Furthermore, the differential scanning calorimetric chart and the differential thermal analysis thermogram were performed. The combination of thermal and electrical parameters confirms the existence of two main structural phase transitions of the first-order type at T ≈ 360.70 K (minor) and at T ≈ 350.70 K (major) in addition to two intermediate phases with a transition temperature at T ≈ 353.75 K. (The major transition precedes the minor one.) Different conduction mechanisms and the universality of ac conduction were discussed. The nature of each detected phase transition has been explained on the basis of the most recent crystal structure and particularly the role of the N-HÁ Á ÁCl hydrogen bonding as a trigger force for phase transitions.

show abstract

Thermochromic phase transitions in two aromatic tetrachlorocuprates

Cited by 21 publications

References 17 publications

Dielectric Dispersion of New Ferroelectric Cobalt Halide Dimers: Bis-ethanolammonium-hexahalocobaltate, (C 2 H 8 NO) 2 Co 2 X 6 , X = CI/Br

Dielectric Dispersion of New Ferroelectric Cobalt Halide Dimers: Bis-ethanolammonium-hexahalocobaltate, (C 2 H 8 NO) 2 Co 2 X 6 , X = CI/Br

Phase Transitions in Some Hydrogen-Bonded Molecules

Electrical and thermal investigations of energetic material (n-C₁₆H₃₃NH₃)₂CdCl₄

Contact Info

Product

Resources

About

Thermochromic phase transitions in two aromatic tetrachlorocuprates

Cited by 21 publications

References 17 publications

Dielectric Dispersion of New Ferroelectric Cobalt Halide Dimers: Bis-ethanolammonium-hexahalocobaltate, (C 2 H 8 NO) 2 Co 2 X 6 , X = CI/Br

Dielectric Dispersion of New Ferroelectric Cobalt Halide Dimers: Bis-ethanolammonium-hexahalocobaltate, (C 2 H 8 NO) 2 Co 2 X 6 , X = CI/Br

Phase Transitions in Some Hydrogen-Bonded Molecules

Electrical and thermal investigations of energetic material (n-C16H33NH3)2CdCl4

Contact Info

Product

Resources

About

Electrical and thermal investigations of energetic material (n-C₁₆H₃₃NH₃)₂CdCl₄