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Phase transitions i...
Phase transitions in KTP isostructures: correlation between structure and T-c in germanium-doped RbTiOPO4
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- Norberg, Stefan, 1972 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Gustafsson, Joacim (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Mellander, Bengt-Erik, 1949 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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(creator_code:org_t)
- 2003
- 2003
- Engelska.
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Ingår i: Acta Crystallographica Section B: Structural Science. - 0108-7681 .- 1600-5740. ; 59:5, s. 588-595
- Relaterad länk:
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https://research.cha...
Abstract
Ämnesord
Stäng
- Crystals of germanium-doped rubidium titanyl phosphate, Rb-2(Ti)(Ge0.121Ti0.879)O-2(PO4)(2) (GeRTP#1) and Rb-2(Ge-0.125-Ti-0.875)(Ge0.225Ti0.775)O-2(PO4)(2) (GeRTP#2), have been structurally characterized from X-ray diffraction data at room temperature. In addition, a third structure, Rb-2(TiO)(2)(PO4)(2) (RTP), has been reinvestigated. The exchange of titanium for germanium results in a less distorted octahedral coordination around the two crystallographically independent titanium sites. Additionally, rubidium split-cation positions have been found in these doped RTP crystals. Dielectric measurements show that the phase-transition temperature, T-c, decreases with increasing germanium concentration, and a direct correlation between the room-temperature split of the rubidium cations and T-c has been discovered. General trends regarding the relationship between the room-temperature structures of KTP-like compounds and their T-c values are discussed.
Ämnesord
- NATURVETENSKAP -- Kemi -- Oorganisk kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Inorganic Chemistry (hsv//eng)
Nyckelord
- X-ray Diffraction
- High Resolution
- KTiOPO4
- Alkaline Displacement
- Range 293-973 K
- Crystal Structure
Publikations- och innehållstyp
- art (ämneskategori)
- ref (ämneskategori)
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