Investigations on synthesis and electrical properties of the La_1.75Nd_0.1Ce_0.15CuO_3.5 prepared by topotactic reduction with CaH₂

Effective Activation of Strong C−Cl Bonds for Highly Selective Photosynthesis of Bibenzyl via Homo‐Coupling

“…These nanoparticles are further identified by the d spacing of fringes, with 0.283 nm for ZnO (100) [44] and 0.207 nm for Cu (111), [45] respectively. The electron paramagnetic resonance (EPR) results (Figure 3c) show a sharp peak for the sample before the reaction, which is owing to I=3/2 of Cu 2+ , so CuO hyperfine structure (g // =2.27, A // ≈90 G) can be observed by EPR spectra, which agrees with the distorted octahedral coordination of Cu 2+ ions in CuO clusters [46–48] . The intensity of Cu 2+ peak decreases after 2 h irradiation and remains similar after 6 h reaction, suggesting that the Cu 2+ species is likely reduced at the beginning of the photoreaction and the reduced Cu metal is EPR‐silent.…”

“…The electron paramagnetic resonance (EPR) results (Figure 3c ) show a sharp peak for the sample before the reaction, which is owing to I=3/2 of Cu 2+ , so CuO hyperfine structure (g // =2.27, A // ≈90 G) can be observed by EPR spectra, which agrees with the distorted octahedral coordination of Cu 2+ ions in CuO clusters. [ 46 , 47 , 48 ] The intensity of Cu 2+ peak decreases after 2 h irradiation and remains similar after 6 h reaction, suggesting that the Cu 2+ species is likely reduced at the beginning of the photoreaction and the reduced Cu metal is EPR‐silent. Thus, there is an in situ activation process where most of Cu 2+ is photo‐reduced to copper, which then acts as the reaction sites.…”

Phase diagram and transition temperatures in the system (T-T’) La2-xNdxCuO4 (x ≤ 0.5)

“…x Nd x CuO 4 (x ≤ 0.5) phase by calcium hydride leads to the formation of an oxygen-deficient phase of the type La 2-x Nd x CuO 3.5 (x ≤ 0.5). This "pseudo-S" phase is then similar to the T' phase with oxygen vacancies in the CuO 2 plane [11]. at moderate temperature (400 • C), the topotactic oxidation kinetically stabilizes the T'-La 2-x Nd x CuO 4 phase.…”

The Cuprate Ln2CuO4 (Ln: Rare Earth): Synthesis, Crystallography, and Applications

“…There is a notable change in the lattice parameters between the S, T′, and T phases. For La2CuOx, the transition from the T structure to the S structure leads to the elongation of the a-and b-axes and to compression of the c-axis, with respect to the structure T. Consequently, a large increase in the volume of the unit cell (~6%) is observed [89,88]. The decrease in the c-axis was associated with the loss of oxygen in the CuO2 plane, as in the example of La2-xSrxCuO4-y.…”