High-temperature phase transitions in pure and deuterated ammonium dihydrogen phosphate: Conductivity and dielectric measurements | Zendy

V. K. Subhadra | Zendy; U. Syamaprasad | Zendy; C. P. G. Vallabhan | Zendy

Open Access

High-temperature phase transitions in pure and deuterated ammonium dihydrogen phosphate: Conductivity and dielectric measurements

Author(s) -

V. K. Subhadra,

U. Syamaprasad,

C. P. G. Vallabhan

Publication year - 1983

Publication title -

journal of applied physics

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.699

H-Index - 319

eISSN - 1089-7550

pISSN - 0021-8979

DOI - 10.1063/1.332330

Subject(s) - dielectric , deuterium , conductivity , phase transition , electrical resistivity and conductivity , thermal conduction , ammonium dihydrogen phosphate , atmospheric temperature range , materials science , ammonium , crystal (programming language) , ion , condensed matter physics , chemistry , analytical chemistry (journal) , thermodynamics , atomic physics , composite material , organic chemistry , optoelectronics , fertilizer , physics , engineering , computer science , electrical engineering , programming language

Results of axiswise measurements of the electrical conductivity (dc and ac) and dielectric constant of NH4H2PO4 confirm the occurrence of the recently suggested high‐temperature phase transition in this crystal (at 133 °C). The corresponding transition in ND4D2PO4 observed here for the first time takes place at 141.5 °C. The mechanism involved in these transitions and those associated with the electrical conduction and dielectric anomalies are explained on the basis of the motional effects of the ammonium ions in these crystals. Conductivity values for deuterated crystals give direct evidence for the predominance of protonic conduction throughout the entire range of temperatures studied (30–260 °C).

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