Journal
PHYSICAL REVIEW B
Volume 83, Issue 18, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.83.184302
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Funding
- Royal Society
- EPSRC
- STFC
- Roberto Rocca Education Program
- INFLPR Bucharest
- Engineering and Physical Sciences Research Council [EP/F004133/1] Funding Source: researchfish
- EPSRC [EP/F004133/1] Funding Source: UKRI
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A new family of relaxor dielectrics with the tetragonal tungsten bronze structure ( nominal composition Ba6M3+Nb9O30, M3+ = Ga, Sc, or In) were studied using dielectric spectroscopy to probe the dynamic dipole response and correlate this with the crystal structure as determined from powder neutron diffraction. Independent analyses of real and imaginary parts of the complex dielectric function were used to determine characteristic temperature parameters, T-VF and T-UDR, respectively. In each composition both these temperatures correlated with the temperature of maximum crystallographic strain, T-c/a, determined from diffraction data. The overall behavior is consistent with dipole freezing and the data indicate that the dipole stability increases with increasing M3+ cation size as a result of increased tetragonality of the unit cell. Crystallographic data suggests that these materials are uniaxial relaxors with the dipole moment predominantly restricted to the B1 cation site in the structure. Possible origins of the relaxor behavior are discussed.
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