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Sinterability of nanopowders of terbia solid solutions with scandia,yttria,and lutetia

Journal of Advanced Ceramics 2018年第4期7卷 362-369页

作者： Stanislav S.BALABANOV Dmitry А.PERMIN Elena Ye.ROSTOKINA Sergey V.EGOROV ANDrey A.SOROKIN G.G.Devyatykh Institute of Chemistry of High-Purity Substances RAS Federal Research Center the Institute of Applied Physics RAS

The synthesis of nanopowders of terbia compounds with scandia, yttria, and lutetia was carried out using a self-propagating high-temperature synthesis method involving a mixture of nitrates of metals and glycine as a precursor. The nanopowder phase transformations were investigated using X-ray diffraction analysis. It was found that lutetia has a negligible effect on the phase formation in terbia. On the other hand, yttrium and scandium ions significantly suppressed crystallization. The densification kinetics of nanopowders of the Tb_2O_3 compounds and the microstructure of ceramics after microwave sintering were studied using dilatometry and scanning electron microscopy. The introduction of scandia, yttria, or lutetia contributed to the intensification of the densification of the terbia ceramics when heated in a microwave field. Near full-density materials of terbia solid solutions with lutetia and yttria were obtained at about 1600–1640 ℃. The ceramics of scandia–terbia compounds contained the second phase, which causes light scattering.

关键词： terbia microwave sintering X-ray analysis ceramics

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非负载和氧化铝负载的纳米CeO_2-ZrO_2和CeO_2-Te_2O_3固溶体催化CO氧化(英文)

引用

催化学报 2011年第5期32卷 800-806页

作者： M.Reddy BENJARAM Thrimurthulu GODE Lakshmi KATTA Inorganic and Physical Chemistry Division Indian Institute of Chemical Technology

Ceria-zirconia(CZ)and ceria-terbia(CT)and alumina-supported ceria-zirconia(CZA)and ceria-terbia(CTA)solid solutions were synthesized by coprecipitation and deposition precipitation methods,*** characteristics and catalytic activity of the synthesized samples have been investigated using X-ray diffraction(XRD),high resolution transmission electron microscopy(HRTEM),X-ray photoelectron spectroscopy(XPS),Raman spectroscopy(RS),and Brunauer-Emmett-Teller(BET)surface area *** evaluate the catalytic properties,total oxygen storage capacity and CO oxidation activity measurements were carried *** XRD analyses revealed the formation of Ce0.75Zr0.25O2 phase for CZ and Ce0.5Zr0.5O2 and Ce0.6Zr0.4O2 phases for CZA samples,*** the formation of only Ce0.8Tb0.2O2-δphase was noted for both CT and CTA *** the supported and unsupported samples adopted a fluorite-type structure and exhibited cell parameters with respect to Vegard's *** HRTEM results indicated well-dispersed particles of the size around 5 *** RS measurements suggested the presence of oxygen vacancies due to defective structure *** XPS studies revealed the presence of cerium in both Ce 4+ and Ce 3+ oxidation states in different *** was found that CO oxidation for CTA occurs at very much lower temperature than CT,CZ,and CZA *** of these findings by correlating with the structural characterization studies are consolidated.

关键词： ceria zirconia terbia alumina-support deposition coprecipitation CO oxidation

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