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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Rare-earth solid-state NMR spectroscopy of intermetallic compounds: The case of the Lu-175 isotope

Texto completo
Autor(es):
Benndorf, Christopher [1, 2] ; de Oliveira Junior, Marcos [3] ; Bradtmueller, Henrik [4] ; Stegemann, Frank [1] ; Poettgen, Rainer [1] ; Eckert, Hellmut [4, 3]
Número total de Autores: 6
Afiliação do(s) autor(es):
[1] Westfalische Wilhelms Univ Munster, Inst Anorgan & Analyt Chem, Corrensstr 30, D-48149 Munster - Germany
[2] Univ Leipzig, Inst Mineral Kristallog & Mat Wissensch, Schamhorststr 20, D-04275 Leipzig - Germany
[3] Univ Sao Paulo, Inst Fis Sao Carlos, CEP 369, BR-13566590 Sao Carlos, SP - Brazil
[4] Westfalische Wilhelms Univ Munster, Inst Phys Chem, Corrensstr 30, D-48149 Munster - Germany
Número total de Afiliações: 4
Tipo de documento: Artigo Científico
Fonte: SOLID STATE NUCLEAR MAGNETIC RESONANCE; v. 101, p. 63-67, SEP 2019.
Citações Web of Science: 1
Resumo

The feasibility of high-resolution Lu-175 solid-state NMR spectroscopy in intermetallic compounds crystallizing with cubic crystal structures is explored by magic-angle spinning NMR at different magnetic flux densities. The large quadrupole moment of this isotope (3.49 x 10(-28) m(2)) restricts observation of the NMR signal to nearly perfectly ordered crystalline samples. Signals are successfully detected and analyzed in the binary pnictides LuPn (NaCl-type structure; Pn = P, As, Sb) and the intermetallic compounds LuPtSb and LuAuSn, both crystallizing with the MgAgAs-type structure. Sources of line broadening are discussed based on field-dependent static and MAS-NMR spectra, providing guidance with respect to measurement conditions resulting in reliable results. The results highlight the importance of ionic/ covalent bonding effects for the detectability of the signal, which reduce the probability of real structure effects commonly observed in intermetallic compounds. No Lu-175 NMR signals can be observed in various cubic Heusler compounds. This is attributed to mixed site occupancies and other structural defects producing electric field gradients whose interaction with the Lu-175 quadrupole moments broadens the signal beyond detection. (AU)

Processo FAPESP: 13/23490-3 - Técnicas de ressonância magnética empregadas no estudo da correlação estrutura/propriedades em vidros e vitrocerâmicas fotônicos
Beneficiário:Marcos de Oliveira Junior
Linha de fomento: Bolsas no Brasil - Pós-Doutorado
Processo FAPESP: 13/07793-6 - CEPIV - Centro de Ensino, Pesquisa e Inovação em Vidros
Beneficiário:Edgar Dutra Zanotto
Linha de fomento: Auxílio à Pesquisa - Centros de Pesquisa, Inovação e Difusão - CEPIDs