Phase transition in Sr0.75Ba0.25NbO3 near the Curie temperature

Qadri, S. B.; Bellotti, Jeffrey A.; Garzarella, Anthony; Wieting, Terence J.; Wu, Dong Ho; Mahadik, Nadeemullah A.

doi:10.1063/1.2398911

Cited by 21 publications

(14 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Negative thermal expansion coefficient occurs at low temperatures, which above the phase transition point increases with the temperature. Our measurements exhibit a similar behavior of thermal expansion coefficients as presented earlier by other authors .…”

Section: Resultssupporting

confidence: 90%

Temperature dependence of lattice parameters of SBN single crystals in the vicinity of their structural phase transitions

Paszkowski

Wokulska

Łukasiewicz

et al. 2013

Crystal Research and Technology

View full text Add to dashboard Cite

Changes of lattice parameters of Sr x Ba 1-x Nb 2 O 6 (0.35 < x < 0.72) solid solution single crystals were measured as a function of temperature. The X-ray Bond' method was used to carry out very precise measurements of the lattice parameters. Fine correlations between values of the lattice parameter and the Sr concentration in the solid solution of Sr x Ba 1-x Nb 2 O 6 single crystals are found. A conventional analysis of lattice parameter data in terms of spontaneous strain and strain/order parameter coupling shows that a normal structural phase transition does occur. While the ferroelectric system (SBN26) displays a nearly tricritical behavior, β ≈ 0.20, the relaxor one (SBN61) complies with the two-dimensional Ising-model-like criticality, β ≈ 0.17.

show abstract

Section: Resultssupporting

confidence: 90%

Temperature dependence of lattice parameters of SBN single crystals in the vicinity of their structural phase transitions

Paszkowski

Wokulska

Łukasiewicz

et al. 2013

Crystal Research and Technology

View full text Add to dashboard Cite

show abstract

“…The thermal expansion measurements exhibit behavior similar to that determined by x-ray measurements on the SBN-75 crystal 26 and by neutron scattering measurements on the SBN-61 crystal. 27 A detailed explanation of the behavior has been given using the Landau-Ginsburg-Devonshire ͑of-ten called LGD͒ phenomenological theory, [28][29][30] which shows that the electrostrictive contribution to the thermal expansion plays an important role in SBN-61.…”

Section: ͑5͒supporting

confidence: 58%

Growth and characterization of Nd-doped Ca0.28Ba0.72Nb2O6 crystal

Gao

Liu

et al. 2009

Journal of Applied Physics

View full text Add to dashboard Cite

We report the growth of a Nd-doped calcium barium niobate (Nd:CBN-28) single crystal using the Czochralski method. The point group and space group of Nd:CBN-28 are determined to be tetragonal 4mm and P4bm, respectively, and the effective segregation coefficients of Nd, Ca, Ba, and Nb are 0.988, 1.029, 0.992, and 0.985, respectively. The density of the material is 5.321 g cm−3 at 19.6 °C, in good agreement with the theoretical value. Thermal expansion measurements reveal that during the heating cycle, the c-axis of Nd:CBN-28 undergoes both thermal contraction and thermal expansion, while at the same time there is only expansion along the a-axis. Specific heat measurements reveal that an anomaly appears at about 220 °C due to a phase transition. The thermal diffusivity increases slowly with increasing temperature. The thermal conductivity of the crystal has been calculated from these results, and the phonon mean free paths la and lc along the a- and c-axes of Nd:CBN-28 crystal are estimated. The transmission spectrum of Nd:CBN-28 crystal along the [001] direction has been measured.

show abstract

“…In the present work, low‐temperature XRD and dielectric measurements were performed to study the structural phase transitions in the dense BST nanoceramics with grain sizes of about 40 and 200 nm. It is well‐known that ferroelectric properties are highly correlated with the thermal expansion . A strong negative thermal expansion behavior in the vicinity of the Curie temperature T C has been reported in BaTiO 3 , Sr 0.75 Ba 0.25 NbO 3 , Ba 1− x Pb x TiO 3 , Pb 1− x Sr x TiO 3 and other perovskite oxides .…”

Section: Introductionmentioning

confidence: 98%

Nanocrystalline Barium Strontium Titanate Ceramics Synthesized via the “Organosol” Route and Spark Plasma Sintering

et al. 2014

View full text Add to dashboard Cite

Dense nanocrystalline barium strontium titanate Ba 0.6 Sr 0.4-TiO 3 (BST) ceramics with an average grain size around 40 nm and very small dispersion were obtained by spark plasma sintering at 950°C and 1050°C starting from nonagglomerated nanopowders (~20 nm). The powders were synthesized by a modified "Organosol" process. X-ray diffraction (XRD) and dielectric measurements in the temperature range 173-313 K were used to investigate the evolution of crystal structure and the ferroelectric to paraelectric phase transformation behavior for the sintered BST ceramics with different grain sizes. The Curie temperature T C decreases, whereas the phase transition becomes diffuse for the particle size decreasing from about 190 to 40 nm with matching XRD and permittivity data. Even the ceramics with an average grain size as small as 40 nm show the transition into the ferroelectric state. The dielectric permittivity e shows relatively good thermal stability over a wide temperature range. The dielectric losses are smaller than 2%-4% in the frequency range of 100 Hz-1 MHz and temperature interval 160-320 K. A decrease in the dielectric permittivity in nanocrystalline ceramics was observed compared to submicrometer-sized ceramics.

show abstract

Phase transition in Sr0.75Ba0.25NbO3 near the Curie temperature

Cited by 21 publications

References 13 publications

Temperature dependence of lattice parameters of SBN single crystals in the vicinity of their structural phase transitions

Temperature dependence of lattice parameters of SBN single crystals in the vicinity of their structural phase transitions

Growth and characterization of Nd-doped Ca0.28Ba0.72Nb2O6 crystal

Nanocrystalline Barium Strontium Titanate Ceramics Synthesized via the “Organosol” Route and Spark Plasma Sintering

Contact Info

Product

Resources

About