Synthesis, Structural, Thermal, and Electronic Properties of Palmierite-Related Double Molybdate α-Cs₂Pb(MoO₄)₂

Abstract

CsPb(MoO) crystals were prepared by crystallization from their own melt, and the crystal structure has been studied in detail. At 296 K, the molybdate crystallizes in the low-temperature α-form and has a monoclinic palmierite-related superstructure (space group C2/m, a = 2.13755(13) nm, b = 1.23123(8) nm, c = 1.68024(10) nm, β = 115.037(2)°, Z = 16) possessing the largest unit cell volume, 4.0066(4) nm, among lead-containing palmierites. The compound undergoes a distortive phase transition at 635 K and incongruently melts at 943 K. The electronic structure of α-CsPb(MoO) was explored by using X-ray emission spectroscopy (XES) and X-ray photoelectron spectroscopy methods. For α-CsPb(MoO), the photoelectron core-level and valence-band spectra and the XES band representing the energy distribution of Mo 4d and O 2p states were recorded. Our results allow one to conclude that the Mo 4d and O 2p states contribute mainly to the central part and at the top of the valence band, respectively, with also significant contributions throughout the whole valence-band region of the molybdate under consideration.

Design of Novel Ytterbium Molybdate Nanoflakes Anchored Carbon Nanofibers: Challenging Sustainable Catalyst for the Detection and Degradation of Assassination Weapon (Paraoxon-Ethyl)

“…From Figure C, the high-resolution C 1s spectrum showed the high intense peak at 286.8 eV which was indexed to epoxy or hydroxyl carbon (C–O) and the Gaussian-fittings at the binding energies of 284.8 and 287.8 eV correspondent to amorphous carbon and carboxyl carbon (O–C = O) species, respectively . The high-resolution Mo 3d (Figure D) core-level XPS spectrum depicts the peaks at 232.3 and 235.6 eV, which were attributed to the Mo 3d 5/2 and Mo 3d 3/2 of the Mo 6+ state. − The O 1s band (Figure E) is a superposition of three-fitted peaks with the binding energies 530.6, 531.2, and 532.1 eV, and the components were assigned to lattice oxygen, chemisorbed oxygen, and adsorbed water molecules on the surface of YbM/ f -CNFs nanocomposite, respectively …”

Structural and Spectroscopic Effects of Li+ Substitution for Na+ in LixNa1-xCaGd0.5Ho0.05Yb0.45(MoO4)3 Scheelite-Type Upconversion Phosphors

“…Complex molybdate crystals have become a subject of extensive investigation due to their diverse crystal chemistry, high chemical stability, and specific physical properties, which are promising for applications in such fields as electronics, laser systems, electrochemistry, and electro-photonics [ 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 ]. These lanthanide-activated double molybdates provide stable chemical and physical characteristics with excellent optical properties for favorable lanthanide admittance, relatively low phonon energy, and versatile applications in such fields as solar cells, lasers, biomedical and optoelectronic devices, optical sensors, etc.…”

MOF-Confined Sub-2 nm Stable CsPbX3 Perovskite Quantum Dots

“…From calculation of the ICP results, the percentage of the CsPbCl 3 , CsPbBr 3 and CsPbI 3 quantum dots loading in MOF pores is 17.56%, 18.39%, and 19.25%, respectively. Figure S9a shows that two strong peaks of CsPbCl 3 @Cu-BDC are located at about 138.9 eV (4f 7/2 ) and about 143.8 eV (4f 5/2 ) with a spin-orbit splitting energy of 4.9 eV which characteristic of Pb 2+ states, and no metallic state of Pb 0 is observed [26], and the 3d spectra of Cs showed there is only one type of Cs, and two signature peaks at 724.2 eV and 738.2 eV are Cs 3d 5/2 and 3d 3/2 , respectively [27,28]. The core levels of Cl 2p in Figure S9a indicated the binding energy peaks at 199.1 eV and 197.8 eV are consistent with Cl 2p 1/2 and 2p 3/2 [29].…”