XPS spectroscopy, structural, magnetic and dielectric investigations of CaGdAlO4 and Yb:CaGdAlO4 single crystals

The structural feature of Ni–Al-LDH nanosheets and their adsorption performance for ethyl mercaptan from methane gas

“…The characteristic peak at 74.2 eV of Al 2p for Ni–Al-LDH-NS is attributed to Al 3+ , while the characteristic peak at A 1 indicates lattice defects caused by oxygen vacancies. 55 Compared with the Al 2p spectrum of Ni–Al-LDH-NS-S, the binding energy of Al 3+ decreased by 0.3 eV and the relative content decreased by 7.43%. The changes of binding energy and relative content in the spectra of Ni 2p 3/2 and Al 2p reveal that part of the electronic charges of the S atom are transferred to Ni and Al atoms in the adsorption process, that is, there are S → Ni and S → Al coordination bonds.…”

Amorphization of Pseudocapacitive T−Nb2O5 Accelerates Lithium Diffusivity as Revealed Using Tunable Isomorphic Architectures

“…Several reports have claimed interstitial O x species in diverse metal oxides, [103][104][105][106][107] however related XPS observations noted those between the lattice O peak and non-lattice O peak. [104][105][106] EPR analysis of samples calcined between 475-600 °C were conducted to detect paramagnetic oxygen species containing unpaired electrons. The resulting spectra did not exhibit detectable signal associated with any paramagnetic oxygen species nor oxygen vacancies (Figure S3).…”

“…Assuming an upper limit oxidation state of Nb 5+ , this stoichiometry suggests a significant presence of oxygen in forms other than oxide O 2− , such as interstitial O 0 , electron deficient oxygen anion O − , superoxide anion O 2 − , peroxide anion O 2 2− , or ozonide anion O 3− . Several reports have claimed interstitial O x species in diverse metal oxides, [103–107] however related XPS observations noted those between the lattice O peak and non‐lattice O peak [104–106] . EPR analysis of samples calcined between 475–600 °C were conducted to detect paramagnetic oxygen species containing unpaired electrons.…”

Advances of Yb:CALGO Laser Crystals

“…Additionally, the great thing for Yb: CALGO is that it not only possesses the aforementioned broadening effect, but also shows excellent stability because those two substitute ions (Yb 3+ , 70 and Gd 3+ , 64) have trivial mass difference compared with Yb 3+ (70) and Ca 2+ (20) [37]. The lattice dimensions of Yb:CALGO are usually determined by X-ray diffraction method and the typical results carried out by Talik et al recently are shown in Table 1 [38].…”