Synthesis, Structural Study and Phase Transitions Characterization by Thermal Analysis and Vibrational Spectroscopy of an Ammonium Rubidium Arsenate Tellurate  

作　　者：GHORBEL Khouloud LITAIEM Hajer KTARI Lilia GARCIA-GRANDA Santiago DAMMAK Mohamed 

机构地区：[1]Laboratoire de Chimie Inorganique(LCI), Universitd de Sfax, Facultd des Sciences de Sfax, BP 1171 Sfax 3000, Tunisia, [2]Laboratoire de Chimie Physique et Analytique, Faeulte de Chimie, Universitte d 'Oviedo, Oviedo 33006, Espagne

出　　处：《Chemical Research in Chinese Universities》2016年第6期902-911,共10页高等学校化学研究（英文版）

摘　　要：The Rb2.42（NH4）0.58（HAsO4）（H2AsO4）. Te（OH）6 crystals（denoted by RbNAsTe） crystallize in the monoc-linic system, space group P21/n with the following parameters： a=1.3059（5） nm, b=0.6755（3） nm, c=1.6675（6） rim,β=94.126（4）°, Z=4 and V=1.46733（10） nm^3. Thermal analyses（DSC, DTA and TG） confirm the presence of the phasetransition and the temperatttre of the decomposition. The vibrational spectroscopy study at room temperature showthe presence and the independence of anionic groups, cationic groups, and give more importance to the hydrogenbonds. Raman spectra were recorded in the temperature range of 298--503 K. The temperature dependence of theRaman line shift, intensity reduction and the half width detects the phase transitions and confirms their nature. So, thephase transition at 453 K corresponds to the superprotonic-ionic conduction phase transition, and those at 483 and491 K correspond to the decomposition of our material.

关 键 词：RbNAsTe X-Ray diffraction Differential scanning CALORIMETRY Phase transition Raman spectrometry 

分 类 号：O[理学]