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Phase transitions in KTP isostructures: correlation between structure and T-c in germanium-doped RbTiOPO4

Stefan T. Norberg (Institutionen för material- och ytkemi, Oorganisk kemi) ; Joacim Gustafsson (Institutionen för material- och ytkemi, Oorganisk kemi) ; Bengt-Erik Mellander (Institutionen för experimentell fysik, Fasta tillståndets fysik)
Acta Crystallographica Section B - Structural Science (0108-7681). Vol. 59 (2003), 5, p. 588-595.
[Artikel, refereegranskad vetenskaplig]

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.

Nyckelord: X-ray Diffraction, High Resolution, Range 293-973 K, Alkaline Displacement, Crystal Structure, KTiOPO4

Denna post skapades 2009-09-09. Senast ändrad 2009-10-26.
CPL Pubid: 97671


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Institutioner (Chalmers)

Institutionen för material- och ytkemi, Oorganisk kemi (2002-2004)
Institutionen för experimentell fysik, Fasta tillståndets fysik (1997-2004)


Oorganisk kemi

Chalmers infrastruktur