Abstract
The transition region between long-range ferroelectric (FE) order and glass order in the phase diagramof the deuteron glass system Rb1− x (ND4) x D2PO4 (D-RADP-x) extends from about x = 0.20 tox = 0.32. In this region we have observed phase segregationbetween the two phase states using 87Rb NMR. We assume that clusters of FE ordernucleate with different local transition temperatures depending on the accidental Rb content at variousplaces in the crystal. The size of the FE clusters must be above a critical value in order to exhibitindividual transition temperatures (T c), as wellas individual soft modes. Soft mode behaviour was unambiguously observed in the temperature dependenceof the 87Rb spin lattice relaxation (T 1)well above the average T c. We expect a clustersize of the order of 5 nm, clearly smaller than the optical wavelength, but well above the observationrange of the Rb nucleus of about 1.4 nm. From our measurements we have determined the total FE andglass phase volume fractions as a function of temperature. The behaviour of the system is discussedfor different crystal compositions in the coexistence region of the two phase states.
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Abbreviations
- ADP:
-
Ammonium dihydrogen phosphate
- AFE:
-
Anti-ferroelectric
- D-RADP:
-
Fully deuterated RADP
- EFG:
-
Electrical field gradient
- FE:
-
Ferroelectric
- KADP:
-
Solid solution of KDP and ADP
- KDP:
-
Potassium dihydrogen phosphate
- KTN:
-
Potassium tantallate-niobate
- NMR:
-
Nuclear magnetic resonance
- NQR:
-
Nuclear quadrupole resonance
- PE:
-
Paraelectric
- RADP:
-
Solid solution of RDP and ADP
- RDP:
-
Rubidium dihydrogen phosphate
- T0, T4:
-
High energy Takagi defects
- T1:
-
Mobile Takagi defect with negative charge
- T2:
-
Slater group
- T3:
-
Mobile Takagi defect with positive charge
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Acknowledgments
The author would like to thank his former PhD students Th. Koenig, and N. Korner, who both left science long ago for other tasks, for performing the measurements and some of the model calculations presented here.
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Kind, R. (2006). Evidence for Ferroelectric Nucleation Centres in the Pseudo-spin Glass System Rb1−x (ND4) x D2PO4: A 87Rb NMR Study. In: Dalal, N.S., Bussmann-Holder, A. (eds) Ferro- and Antiferroelectricity. Structure and Bonding, vol 124. Springer, Berlin, Heidelberg. https://doi.org/10.1007/430_2006_042
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DOI: https://doi.org/10.1007/430_2006_042
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