| Autor: |
Solodovnikov SF, Atuchin VV; Functional Electronics Laboratory, Tomsk State University , Tomsk 634050, Russia.; Laboratory of Single Crystal Growth, South Ural State University , Chelyabinsk 454080, Russia.; Institute of Chemistry, Tyumen State University , Tyumen 525003, Russia., Solodovnikova ZA, Khyzhun OY; Frantsevich Institute for Problems of Materials Science, National Academy of Sciences of Ukraine , 3 Krzhyzhanivsky Street, Kyiv UA-03142, Ukraine., Danylenko MI; Frantsevich Institute for Problems of Materials Science, National Academy of Sciences of Ukraine , 3 Krzhyzhanivsky Street, Kyiv UA-03142, Ukraine., Pishchur DP, Plyusnin PE, Pugachev AM; Laboratory of Condensed Matter Spectroscopy, Institute of Automation and Electrometry, SB RAS , Novosibirsk 90, 630090, Russia., Gavrilova TA, Yelisseyev AP; Laboratory of High Pressure Minerals and Diamond Deposits, Institute of Geology and Mineralogy, SB RAS , Novosibirsk 630090, Russia., Reshak AH; New Technologies - Research Centre, University of West Bohemia , Univerzitni 8, 306 14 Pilsen, Czech Republic.; School of Material Engineering, University Malaysia Perlis , 01007 Kangar, Perlis, Malaysia., Alahmed ZA; Department of Physics and Astronomy, College of Science, King Saud University , P.O. Box 2455, Riyadh 11451, Saudi Arabia., Habubi NF; Physics Department, Education Faculty, University of Al-Mustansiriyah , Baghdad, Iraq. |
| Abstrakt: |
Cs 2 Pb(MoO 4 ) 2 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 3 , 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-Cs 2 Pb(MoO 4 ) 2 was explored by using X-ray emission spectroscopy (XES) and X-ray photoelectron spectroscopy methods. For α-Cs 2 Pb(MoO 4 ) 2 , 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. |
