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Elucidating elusive quaternary selenide EuCeCuSe3:Synthesis,crystal structure,properties and theoretical studies

Journal of rare Earths 2024年第1期42卷 163-171,I0006页

作者： Maxim v.Grigoriev Anna v.ruseikina Maxim S.Molokeev vladimir A.Chernyshev Aleksandr S.Aleksandrovsky alexander S.Krylov Svetlana N.Krylova nikolai p.shestakov.d.itriy a.v.likanov.alexand.r a.garmonov.alexey v.matigorov.ev.eny a.ostapchuk Thomas Schleid damir A.Safin Laboratory of Theory and Optimization of Chemical and Technological processes University of TyumenVolodarskogo Str.6625003TyumenRussian Federation Kirensky Institute of physics Federal Research Center KSC SB RASAkademgorodok 50 Bld.38660036KrasnoyarskRussian Federation department of physics Far Eastern State Transport UniversitySerysheva Str.47680021KrasnoyarskRussian Federation Institute of Natural Sciences and Mathematics Ural Federal University Named After the First President of Russia B.N.YeltsinMira Str.19620002EkaterinburgRussian Federation department of photonics and Laser Technology Siberian Federal UniversitySvobodnii Ave.79660079KrasnoyarskRussian Federation Institute of physics and Technology University of TyumenVolodarskogo Str.6625003 TyumenRussian Federation Institute for Inorganic Chemistry University of StuttgartPfaffenwaldring 55D-70569StuttgartGermany Scientific and Educational and Innovation Center for Chemical and pharmaceutical Technologies Ural Federal University named after the First President of Russia B.N.YeltsinMira Str.19620002 EkaterinburgRussian Federation University of Tyumen Volodarskogo Str.6625003TyumenRussian Federation

We report on the novel heterometallic quaternary selenide EuCeCuSe3,the fabrication of which has been a challenge until this *** structure of the reported selenide was elucidated from the powder X-ray diffraction data,which revealed the formation of EuCeCuSe3with excellent yield(96.7%)accompanied with a minor fraction of CeSe2(3.3%),and was best solved in orthorhombic space group pnma with the BaLaCuS3structural ***,the crystal structure of the title compound completes the row of the heterometallic quaternary selenides EurECuSe3(rE=La,pr,Nd,Sm,Eu,Gd,Tb,dy,Ho,Er,Tm,Yb,Lu,Y),of which the cerium-based derivative exclusively belongs to the BaLaCuS3structural *** distortion of the CuSe4polyhedron was compared for the whole series of EurECuSe3compounds using theτ4-descriptor for four coordinated ions,which revealed the highest degree of distortion for the Ce3+-containing selenide,followed by the La3+-based ***,the crystallographic and geometrical parameters of the reported selenide were discussed in comparison to the Ce3+-based sulfides SrCeCuS3and *** initio calculations of the crystal structure,a phonon spectrum and elastic constants for the crystal of EuCeCuSe3were also *** types and wavenumbers of fundame ntal modes were determined and the involvement of ions participating in the phonon modes was *** experimental Ir spectrum of the reported selenide was interpreted and found to be in agreement with the calculated *** experimental direct band gap of EuCeCuSe3was measured to be 1.36 ev that is consistent with the concept of its origin due to interband transitions between orbitals emerging mainly from 4f(valence band)and 5d(conduction band)levels of the Eu2+*** dependence of the Young’s modulus on the direction demonstrates the anisotropy of the elastic properties,while the vickers hardness for EuCeCuSe3was calculated to be 5.2 ***,the title compound is paramagnetic above 4 K.

关键词： Quaternary selenide Synthesis Crystal structure Ab initio calculations Magnetic measurements Spectroscopy

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Junction properties and conduction mechanism of new terbium complexes with triethylene glycol ligand for potential application in organic electronic device

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Journal of rare Earths 2014年第7期32卷 633-640页

作者： N.K.Za’aba M.A.Mohd Sarjidan W.H.Abd.Majid eny Kusrini Muhammad I.Saleh Low dimensional Materials research Centre Physics DepartmentUniversity Malaya department of Chemical Engineering Faculty of EngineeringUniversitas Indonesia School of Chemical Sciences Universiti Sains Malaysia

Terbium-picrate triethylene glycol（EO3-Tb-pic） complex was prepared in thin film and single layer device structure of ITO/EO3-Tb-pic/Al, using spin coating technique. The Uv-vis absorption spectroscopy analysis was performed to evaluate the electronic molecular transition of the complex. The optical band gap, Eg estimated from the Tauc model revealed that EO3-Tb-pic thin film exhibited a direct transition with Eg of 2.70 ev. The electronic parameters of the ITO/EO3-Tb-pic/Al device such as the ideality factor n, barrier height Φb, saturation current Io, and series resistance rs, were extracted from the conventional lnI-v, Cheung＇s functions and Norde＇s method. It was found that the evaluated parameters calculated from Norde＇s and Cheung＇s methods were consistent with those calculated from the conventional I-v method. In the double logarithmic I-v plot, three distinct regions based on the slope were identified, and the conduction mechanisms were discussed and explained. The mobility, μ value was estimated from SCLC region as 2.58×10^–7 cm2/（v·s）. This newly obtained lanthanide complex may be potentially utilized in electronic devices.

关键词： terbium-picrate complex triethylene glycol Tauc model optical band gap current-voltage rare earths

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