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Titolo:
A Mossbauer study of La1-xEuxB6 compounds synthesized at high pressure andtemperature
Autore:
Li, LP; Li, GS; Su, WH; Zhao, XD; Liu, XY;
Indirizzi:
Jilin Univ, Dept Phys, Changchun 130023, Peoples R China Jilin Univ Changchun Peoples R China 130023 chun 130023, Peoples R China Chinese Acad Sci, Key Lab Rare Earth Chem & Phys, Changchun 130022, Peoples R China Chinese Acad Sci Changchun Peoples R China 130022 30022, Peoples R China
Titolo Testata:
HYPERFINE INTERACTIONS
fascicolo: 4, volume: 128, anno: 2000,
pagine: 409 - 415
SICI:
0304-3843(2000)128:4<409:AMSOLC>2.0.ZU;2-8
Fonte:
ISI
Lingua:
ENG
Soggetto:
EU-151 MOSSBAUER;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
12
Recensione:
Indirizzi per estratti:
Indirizzo: Li, LP Jilin Univ, Dept Phys, Changchun 130023, Peoples R China Jilin Univ Changchun Peoples R China 130023 0023, Peoples R China
Citazione:
L.P. Li et al., "A Mossbauer study of La1-xEuxB6 compounds synthesized at high pressure andtemperature", HYPER INTER, 128(4), 2000, pp. 409-415

Abstract

A series of hexaborides La1-xEuxB6 (x=0.0-1.0) were synthesized under a pressure of 3.5 GPa and at a temperature of 1600 degreesC using La2O3, Eu2O3 and amorphous boron as the starting materials. The products were characterized by X-ray Diffraction (XRD) and Mossbauer spectroscopy. XRD data analysis shows that all samples crystallize in a cubic CsCl-type structure, and the cell volume increases with x. Room temperature Eu-151 Mossbauer measurements reveal that Eu ions in all samples are in the divalent state, except for the x=1.0 sample where a small amount of Eu3+ ions was detected. The quadrupole splitting of the Eu2+ ions is positive. Eu ions were reduced from trivalent to divalent during the high-pressure and -temperature processes. The isomer shifts of the Eu2+ ions are all smaller than -12.5 mm/s, suggesting that there is no valence fluctuation in the samples. The hexaborides doped by divalent Eu are not metallic.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 21/01/20 alle ore 07:00:50