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Synthesis and study...
Synthesis and study of Sr-substituted misfit layer sulfides
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- Grippa, Alexander Yu (författare)
- Stockholms universitet,Institutionen för fysikalisk kemi, oorganisk kemi och strukturkemi
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- Lidin, Sven (författare)
- Stockholms universitet,Institutionen för fysikalisk kemi, oorganisk kemi och strukturkemi
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D'yachenko, Oleg G. (författare)
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Rupasov, Dmitry P. (författare)
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Antipov, Eugeny V. (författare)
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(creator_code:org_t)
- Elsevier, 2005
- 2005
- Engelska.
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Ingår i: Materials Research Bulletin. - : Elsevier. - 0025-5408. ; 40:1, s. 79-91
- Relaterad länk:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- Two series of [(Ln1/3Sr2/3S)1.5]1.15NbS2 (1.5Q/1H) and (Ln1−xSrxS)1+yNbS2 (1Q/1H) misfit layer sulfides have been synthesised and studied by X-ray powder and single crystal diffraction, EDX-analysis and magnetic measurements. For the early lanthanides (Ln = La, Ce) only the (Ln1−xSrxS)1+yNbS2 (x < 0.40–0.45, y = 0.15–0.17) compounds were formed whereas for late lanthanides (Ln = Pr, Nd, Sm, Gd–Er, Yb, Lu), and yttrium, both types of phases can be obtained. The crystal structure of (Pr0.55Sr0.45S)1.15NbS2 has been refined on the basis of X-ray single crystal data using the superspace approach. It consists of double layers [Pr0.55Sr0.45S] of NaCl-type (Q-part: a = 5.799(3) Å, b = 5.810(2) Å, c = 23.331(9) Å, z = 4) and NbS2-sandwiches (H-part: a = 3.332(3) Å), z = 8, yielding a q-vector q = (α 0 0), α = 0.74) alternating along the c-direction. The superspace group pair is Fm2m (α 0 0):Fm2m (α 0 0) (No. 42.7). The refinement converged to Rw(obs) = 0.069. According to the structure refinement and EDX-analysis data in the [Pr0.55Sr0.45S]-slab almost half of the Pr-atoms are randomly replaced by Sr. The minimal formal value of charge transfer from the Q- to the H-part of the structure necessary to stabilise the misfit Nb-based layer sulfides has been estimated as about 0.6 ē per Nb atom.
Ämnesord
- NATURVETENSKAP -- Kemi -- Fysikalisk kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Physical Chemistry (hsv//eng)
Nyckelord
- Chemical physics
- Kemisk fysik
- kemisk fysik
- Chemical Physics
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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