Abstract
Single crystals of ammonium dihydrogen phosphate (ADP) were grown from supersaturated aqueous solution by a slow evaporation technique. The crystal structure of these crystals was investigated by X-ray diffraction (XRD). The ADP crystals showed an ohmic behaviour up to 800 volts with a resistivity of 4.6×106 Ω cm at room temperature. The electrical conductivity temperature dependence showed two distinct regions separated by a knee at 92 °C. Below the knee, the conductivity is slightly temperature dependent while above the knee it is highly temperature dependent. The values of activation energy were estimated as 0.480 eV and 0.135 eV above and below the knee, respectively. The conduction processes above and below the knee were explained by the mechanism of phosphate group rotation and proton jump, respectively. Thermal analysis as well as XRD confirmed the knee temperature.
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A. I. AL-ADL, A. ABDEL-KADER, M. S. ELMAN-HARAWY and H. I. FARAG,J. Solids 4 (1982) 29.
H. I. FARAG, M. S. ELMANHARAWY and A. ABDELKADER, ibid.5 (1983) 7.
A. ABDEL-KADER, A. I. AL-ADL, H. I. FARAG and M. S. ELMANHARAWY, ibid.,5 (1983) 16.
H. I. FARAG, M. S. ELMANHARAWY and A. ABDEL-KADER,Acta Phys. Hungarica 60 (1986) 19.
A. ABDEL-KADER, A. A. AMMAR and S. I. SPALEH,Thermochim. Acta (1990) accepted for publication.
Idem, ibid. (1990) accepted for publication.
L. GLASSER,Chem. Rev. 75 (1975) 21.
E. J. MURPHY,J. Appl. Phys. 32 (1964) 2609.
V. H. SHMIDT,J. Sci. Instrum. 42 (1965) 889.
J. M. POLLOCK and M. SHARON,J. Chem. Phys. 51 (1969) 3604.
L. B. HARRIS and G. J. VELLA, ibid.58 (1973) 4550.
M. SHARON and A. K. KALIA,J. Solid State Chem. 21 (1977) 171.
C. T. PERRINO and P. WENTRCEK, ibid.10 (1974) 36.
R. S. VISWANATH and P. J. MILLER,Solid State Commun. 32 (1979) 703.
V. K. SUBHADRA, U. SYAMAPRASAD and C. P. G. VALLABHAN,J. Appl. Phys. 54 (1983) 2593.
S. C. SABHARWAL and B. GHOSH,Phys. Status Solidi (a) 89 (1985) K83.
J. K. RATH and S. RADHAKRISHNA,Cryst. Lattice Defects Amorphous Mater. 17 (1987) 335.
R. UEDA,J. Phys. Soc. 3 (1948) 328.
B. C. FRAZER and R. PERINSKY,Acta Cryst. 6 (1953) 273.
R. O. KELLING and R. PEPINSKY,Z. Kristallogr. 106 (1955) 236.
A. R. UBELOHDE and I. WOODWARD,Proc. Roy. Soc. (London)A188 (1947) 358.
J. Y. NICHOLSON and J. F. SOEST,J. Chem. Phys. 60 (1974) 715.
B. V. R. CHOWDARI and Y. R. SEKHAR,Phys. Status Solidi (a) 54 (1979) 413.
L. TENZER, B. C. FRAZER and R. PEPINSKY,Acta Cryst. 11 (1958) 505.
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Abdel-Kader, A. Electrical conductivity of ammonium dihydrogen phosphate crystals with regard to crystal structure and thermal analysis. J Mater Sci: Mater Electron 2, 7–10 (1991). https://doi.org/10.1007/BF00694996
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DOI: https://doi.org/10.1007/BF00694996