Zobrazeno 1 - 10
of 41
pro vyhledávání: '"D.M Araújo Melo"'
Autor:
M. K. S. Batista, Klaus Zinner, D.M Araújo Melo, L.B. Zinner, G. Vicentini, Julio Zukerman-Schpector, E. P. Marinho, A. M. Garrido Pedrosa, H. K. S. de Souza
Publikováno v:
Journal of Solid State Chemistry. 171:242-245
Lanthanide nitrate complexes of bis(pentamethylene)urea (BPMU) with general formula Ln(NO 3 ) 3 3BPMU, where Ln: La, Nd, Sm, Eu, Ho and Er have been prepared and characterized based on CHN elemental analyses, lanthanide titration with EDTA, molar con
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c8a4d945aaaa6db757be05bd5f3996a1
https://doi.org/10.1016/s0022-4596(02)00159-7
https://doi.org/10.1016/s0022-4596(02)00159-7
Autor:
L.B. Zinner, J.D.G. Fernandes, C Alves Júnior, Z. R. Silva, Elson Longo, J.A.P da Costa, C.M Salustiano, D.M Araújo Melo
Publikováno v:
Journal of Alloys and Compounds. 344:157-160
Nanostructured materials with perovskite structure have been extensively studied in the last few years due to their potential for a variety of applications. In the present study NdNiO3 was obtained from polymeric precursors, at a temperature of 800
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::544149dcd385deaf502b5cfe9086fda6
https://doi.org/10.1016/s0925-8388(02)00357-2
https://doi.org/10.1016/s0925-8388(02)00357-2
Publikováno v:
Journal of Alloys and Compounds. 344:83-87
Terbium(III), holmium(III) and erbium(III) picrate (pic) complexes with pyzDO with composition: [Ln(pic) (pyzDO) (H 2 O) 6 ](pic) 2 (pyzDO)(H 2 O), were prepared by reaction of the respective hydrated picrates in ethanolic solutions with a water solu
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::b3f2b001143d9962f1957e5068a45a8c
https://doi.org/10.1016/s0925-8388(02)00313-4
https://doi.org/10.1016/s0925-8388(02)00313-4
Autor:
E. V. Sobrinho, J.A.C Ruiz, Marcus Antônio de Freitas Melo, Antonio Eduardo Martinelli, D.M Araújo Melo
Publikováno v:
Repositório Institucional da UFRN
Universidade Federal do Rio Grande do Norte (UFRN)
instacron:UFRN
Universidade Federal do Rio Grande do Norte (UFRN)
instacron:UFRN
Palygorskite clays containing 2, 4, 6 or 10% lanthanum (w/w) were prepared by ion-exchange from acid-leached natural clays. Samples were characterized by chemical and thermogravimetric analysis, X-ray diffraction, infrared spectroscopy, and N2 adsorp
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a2399b9de641c9cb477125a75037892d
https://doi.org/10.1016/s0925-8388(02)00384-5
https://doi.org/10.1016/s0925-8388(02)00384-5
Autor:
D.M Araújo Melo, Patrícia Mendonça Pimentel, L.B. Zinner, Antonio G. Souza, F. M. M. Borges, A. M. Garrido Pedrosa, H. Scatena
Publikováno v:
Journal of Thermal Analysis and Calorimetry. 67:397-402
Ln(TFA)3⋅3AZA (Ln=La, Sm, Er; TFA=trifluoroacetate and AZA=2-azacyclononanone)compounds were synthesized and characterized by microanalytical procedures, IR spectroscopy, X-ray powder diffraction, and thermal analysis. A kinetic study using La, Sm
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::6bd44d8ecfafa8dba3ec143628846119
https://doi.org/10.1023/a:1013983303200
https://doi.org/10.1023/a:1013983303200
Publikováno v:
Journal of Alloys and Compounds. :22-25
Complexes of hydrated lanthanide picrates with composition: [Ln 2 (pic) 2 (pyzDO)(H 2 O) 12 ](pic)4 (pyzDO) 2 (H 2 O) 4 (Ln=Pr, Nd, Sm, Eu; pic=picrate; pyzDO=1,4-pyrazine-dioxide) were synthesized by reaction of the hydrated picrates in ethanolic so
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c19a1fd48c9065b3723bf90f4b778a87
https://doi.org/10.1016/s0925-8388(01)01001-5
https://doi.org/10.1016/s0925-8388(01)01001-5
Publikováno v:
Microporous and Mesoporous Materials. 38:345-349
Palygorskite clays containing 5% and 10% terbium (W/W) were prepared by ion exchange from acid-leached natural clay. Samples were calcined at 523, 573, 623 and 673 K to verify the effect of the temperature over the physical–chemical properties. Cha
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::676cde8d32346fb03461beef270cd5ab
https://doi.org/10.1016/s1387-1811(00)00155-4
https://doi.org/10.1016/s1387-1811(00)00155-4
Autor:
D.M Araújo Melo, L.B. Zinner, H. K. S. de Souza, J. Zukerman-Schpector, Klaus Zinner, Geraldo Vicentini, J. D. Gomes Fernandes
Publikováno v:
CIÊNCIAVITAE
Scopus-Elsevier
Scopus-Elsevier
Complexes with composition [Ln(NO3)3(AZA)3] (Ln=Nd, Eu, Gd, Tb, Ho and Er) were synthesized and characterized by CHN elemental analyses and lanthanide titration with EDTA. IR spectra show that they are anhydrous and the ligands (AZA) bonded through t
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f16b42a0358f83c5df9a28dfb94f14af
https://doi.org/10.1016/s0925-8388(00)00660-5
https://doi.org/10.1016/s0925-8388(00)00660-5
Autor:
Klaus Zinner, Geraldo Vicentini, D.M Araújo Melo, E. P. Marinho, J. Zukerman-Schpector, L.B. Zinner
Publikováno v:
Journal of Alloys and Compounds. :116-120
Compounds with composition Ln(pic)3·2pyzNO·7H2O (Ln=Nd, Eu; pic=picrate; pyzNO=pyrazine-N-oxide) were obtained by reaction of the hydrated lanthanide picrate with pyrazine-N-oxide in ethanol (molar ratio 1:4). The adducts were characterized by elem
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::753f01955f3fea51f1f9c9d4b2192ea1
https://doi.org/10.1016/s0925-8388(00)00615-0
https://doi.org/10.1016/s0925-8388(00)00615-0
Autor:
D.M Araújo Melo, Alasse Oliveira da Silva, H. Scatena, L.B. Zinner, F. M. M. Borges, M.F.F Pedrosa
Publikováno v:
Scopus-Elsevier
Terbium trifluoromethanesulfonate compound with hexamethylphosphoramide was synthesized and characterized. Thermogravimetric data with three heating rates were used to obtain kinetic parameters such as activation energy (Ea), reaction order (n) and p
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::193f9fe98b2e82a22c6cfdd7ef177945
https://doi.org/10.1016/s0925-8388(00)00621-6
https://doi.org/10.1016/s0925-8388(00)00621-6