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Electronic and Structural Properties of the Liquid (Tl 1/2 Pb 1/2 )‐Se System
Author(s) -
Usuki T.,
Itoh K.,
Aita S.,
Kameda Y.,
Uemura O.
Publication year - 1995
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221870115
Subject(s) - seebeck coefficient , diamagnetism , electrical resistivity and conductivity , liquidus , magnetic susceptibility , analytical chemistry (journal) , neutron diffraction , materials science , stoichiometry , ionic bonding , chemistry , crystallography , ion , phase (matter) , crystal structure , physics , organic chemistry , quantum mechanics , chromatography , magnetic field , electrical engineering , engineering
The electrical conductivity, magnetic susceptibility, and thermoelectric power in the liquid (Tl 1/2 Pb 1/2 ) Se system are measured over wide temperature and composition ranges. It is observed that the electrical conductivity in the system sharply falls near the stoichiometric composition of Tl 2 Pb 2 Se 3 and the magnetic susceptibility has a diamagnetic maximum at this composition, where the thermoelectric power changes its sign. In addition, the DTA investigation shows that the liquidus temperature of the system has a maximum around this composition. These results suggest that a short‐range order appears around the composition of Tl 2 Pb 2 Se 3 in the liquid (Tl 1/2 Pb 1/2 )‐Se system. The delocalized electron analysis using both susceptibility and conductivity data suggests that the bonding nature of liquid Ti 2 Pb 2 Se 3 is rather ionic. The radial distribution study by neutron diffraction also exhibits that the first peak position of g( r ) for liquid Tl 2 Pb 2 Se 3 is located near the ionic bond distance of metal and chalcogen atoms. On the other hand, covalent Se‐ Se bonds are formed in the Se‐rich composition range.