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

• 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

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