Abstract
Systematic studies of the ZrCuSiAs (also LaOAgS or 1111) structure type resulted in the synthesis of two new fluoride chalcogenides, EuFAgSe and EuFAg1-delta Te, whereas their sulfide analog, EuFAgS, could not be obtained. Both new compounds are tetragonal,P4/nmm, with cell parametersa= 4.1542(1) angstrom,c= 9.2182(1) angstrom for the selenide anda= 4.3255(1) angstrom,c= 9.5486(1) angstrom for ...
Abstract
Systematic studies of the ZrCuSiAs (also LaOAgS or 1111) structure type resulted in the synthesis of two new fluoride chalcogenides, EuFAgSe and EuFAg1-delta Te, whereas their sulfide analog, EuFAgS, could not be obtained. Both new compounds are tetragonal,P4/nmm, with cell parametersa= 4.1542(1) angstrom,c= 9.2182(1) angstrom for the selenide anda= 4.3255(1) angstrom,c= 9.5486(1) angstrom for the telluride. Rietveld refinement reveals a significant silver deficiency in the telluride (delta= 0.05), while the selenide is nearly stoichiometric. Both compounds are semiconductors as shown by diffuse reflectance spectroscopy and confirmed by density-functional calculations of the band structure. Magnetism of both compounds is predominantly driven by Eu2+, as indicated by magnetic susceptibility measurements and corroborated by(151)Eu Mossbauer spectroscopy. EuFAg1-delta Te and EuFAgSe are paramagnetic down to 1.8 K.
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