Some aspects of the electrical and thermal properties of ammonium hydrogen tartrate
Abdel-Kader, M. M. ; Ei-Tanahy, Z. H. ; Abdel-Razik, A. ; Abutaleb, M. ; El-Shawarby, A.
Springer
Published 1995
Springer
Published 1995
| ISSN: |
1573-482X
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| Source: |
Springer Online Journal Archives 1860-2000
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| Topics: |
Electrical Engineering, Measurement and Control Technology
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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| Notes: |
Abstract The relative permittivity (ɛ) and the electrical resistivity (ϱ) were measured at varying temperature from 310 up to 490 K for polycrystalline samples of ammonium hydrogen tartrate (AHT), NH4HC4H4O6. The measured parameters revealed that the compound undergoes successive solid-state structural phase transitions at ~ 368 K, 428 K and ~ 473 K, in addition to a probable change in the conduction mechanism at ~ 333 K. A differential thermal analysis (DTA) thermogram and a thermogravimetric analysis (TGA) plot were also performed from room temperature (~ 300 K) up to the melting point. The DTA results strongly support the existence of the above-mentioned solid-state phase transitions, whereas the TGA plot indicates the absence of any actual loss in weight in the transition temperature regions. The data are correlated to the reorientational motion of the NH4 + ion, combined with the arrangement of the molecules in their crystals and in particular the hydrogen bonding system.
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| Type of Medium: |
Electronic Resource
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| URL: |