PROTON-GLASS BEHAVIOR AND PHASE-DIAGRAM OF THE K1-X(NH4)XH2PO4 SYSTEM

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Both real and imaginary parts of the dielectric constants are measured in the pellet samples of K1-x(NH4)xH2PO4 [(KDP)1-x(ADP)x or (ADP-x] for a full range of mixing concentrations x from x = 0 to x = 1 at temperatures from room temperature to 15 K. Both ferroelectric and antiferroelectric phase transitions are observed for x < 0. 22 and x > 0.70, respectively, but proton-glass behaivor is observed in the range 0.28 < x < 0.64 and phase coexistences are observed for x of the phase boundary layers in the pressed pellet samples of KADP-x. Observation of the proton-glass behavior in the mixed-pellet system of KADP-x, which consists of microcrystalline grains, seems to confirm that the proton-glass phase may originate from a strong frustration in the short-range pairing of hydrogen bonds associated with randomly competing site interactions.
Publisher
AMERICAN PHYSICAL SOC
Issue Date
1993
Language
English
Article Type
Note
Keywords

MIXED-CRYSTALS; FERROELECTRIC ORDER; RB1-X(NH4)XH2ASO4; STATE

Citation

PHYSICAL REVIEW B, v.48, no.9, pp.6639 - 6642

ISSN
0163-1829
DOI
10.1103/PhysRevB.48.6639
URI
http://hdl.handle.net/10203/60844
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