Dipole ordering, ionic conductivity, and cold nuclear fusion: Three types of cation mobility in the orthophosphates KTiOPO{sub 4} Na{sub 3}M{sub 2}(PO{sub 4}){sub 3} (M=Sc,Fe,Cr), NaTh{sub 2}(PO{sub 4}){sub 3}, KD{sub 2}PO{sub 4}, and related compounds
- Inst. of Physical Chemistry, Moscow (Russian Federation)
As shown in earlier studies, crystals whose structures contain closely located positions statistically occupied by metal cations (split positions) may exhibit anomalies in physical properties, such as ferroelectric (FE) or antiferroelectric (AFE) ordering, superionic conduction (SIC), low thermal expansion coefficients, ultrarapid nuclear relaxation, etc. For example, splitting of Na positions lead to Fe ordering in low-temperature structures of Na{sub 3}Sc{sub 2}(PO{sub 4}){sub 3} and NaTh{sub 2}(PO{sub 4}){sub 3} and to AFE ordering in Na{sub 3}Zr{sub 2}Si{sub 2}PO{sub 12} (stoichiometric NASICON - one of the best three-dimensional superionic conductors). The coexistance of two types of split cation positions in KFeFPO{sub 4} was reported by Belokoeneva et al.; later, these splittings were shown to be accompanied by FE and AFE ordering. In this paper, the authors report an attempt to establish inter-relations between various physical phenomena related to cation mobility. They discuss three manifestations of cation mobility in orthophosphates with split cation positions: dipole ordering of both FE and AFE types, superionic conduction, and cold nuclear fusion (CNF).
- OSTI ID:
- 171695
- Journal Information:
- Inorganic Materials, Vol. 31, Issue 5; Other Information: PBD: May 1995; TN: Translated from Neorganicheskie Materialy; 31: No. 5, 604-613(1995)
- Country of Publication:
- United States
- Language:
- English
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