Room-temperature synthesis and crystal, magnetic, and electronic structure of the first silver copper oxide.
Ag(2)Cu(2)O(3) is the first known silver copper oxide. It was prepared by coprecipitation at room temperature and ambient pressure and shows an increased thermal stability compared with silver oxides. The crystal structure (tetragonal, a = 5.8862(2) A, c = 10.6892(4) A, Z = 4, I4(1)/amd) was refined from neutron and X-ray powder diffraction data, and it is related to that of the mineral paramelaconite (Cu(4)O(3)). In addition to a thorough characterization (chemical and TG analyses, XPS, crystal structure, and electrochemical, magnetic, and transport properties), we have carried out band structure calculations [extended Hückel tight binding (EHTB) and spin polarized density functional (DFT) band calculations] for the title silver copper oxide and for the related paramelaconite structure (Cu(II)-Cu(I) mixed-valence system) with special incidence into the magnetic behavior and coupling constants in these magnetically novel 3-D compounds. This new oxide represents an important precedent in solid state inorganic chemistry but also has potential interest concerning its magnetic, electrochemical, and catalytic properties.
Tejada-Rosales
Eva M
EM
Institut de Ciència de Materials de Barcelona (CSIC), Campus UAB, E-08193 Bellaterra, Barcelona, Spain.
Rodríguez-Carvajal
Juan
J
Casañ-Pastor
Nieves
N
Alemany
Pere
P
Ruiz
Eliseo
E
El-Fallah
M Salah
MS
Alvarez
Santiago
S
Gómez-Romero
Pedro
P