PC based ferroelectric analyzer using modified sawyer and tower circuit

Singh, K.; Limaye, S. S.; Tiwari, Ravi; Nath, Subhrapratim; Bhoga, S. S.

doi:10.1080/00150199608213398

Cited by 4 publications

(1 citation statement)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The dielectric hysteresis was determined on a disk of polycrystalline NaSb 3 F 10 , prepared as in x3.3, by use of a modified Sawyer & Tower (1930) circuit (see Singh et al, 1996), modified further by means of a BK Precision 4011A 5 MHz function generator with a TREK 677B HV supply/ amplifier for the applied field. An oscilloscope measured the polarization through a 1000:1 Caddock Electronics Inc. THU10 voltage divider network.…”

Section: Dielectric Hysteresis and Spontaneous Polarizationmentioning

confidence: 99%

Phase transitions and ferroelectricity in NaSb₃F₁₀

Christie

Photinos

et al. 2008

J Appl Cryst

View full text Add to dashboard Cite

Atomic coordinate analysis allows materials with appropriate but previously unrecognized dielectric properties to be predicted as new ferroelectrics if their crystal structure is known. An earlier such prediction that NaSb 3 F 10 is ferroelectric is confirmed herein without ambiguity. Its spontaneous polarization P s is found to exhibit reproducible dielectric hysteresis at room temperature, with P s ' 60 mC m À2 , under the application of a field of 0.3 MV m À1 or greater. The pyroelectric coefficient h pi = 17 (5) mC m À2 K À1 at 298 K. NaSb 3 F 10 undergoes a phase transition at T C ' 461 K, on correction for thermal hysteresis, with entropy change ÁS = 5.7 (3) J mol À1 K À1 . The colorless crystals melt at T m ' 515 K and decompose above $600 K. The thermal hysteresis of $35 K in T C , on heating and cooling at 5-25 K min À1 , is typical of first-order phase transitions. The space group in ferroelectric phase III is P6 3 , and that in phase II is predicted to be P6 3 22, a nonpolar supergroup of P6 3 ; the supergroup expected in the prototypic nonferroic phase I is P6 3 /mmc. The space group of phase III is not a direct subgroup of phase I. The dielectric permittivity " 0 at 1 kHz increases over an order of magnitude between 300 K and a major inflection at T C , continuing to increase steadily thereafter to T m . ‡ Present address:

show abstract

Section: Dielectric Hysteresis and Spontaneous Polarizationmentioning

confidence: 99%

Phase transitions and ferroelectricity in NaSb₃F₁₀

Christie

Photinos

et al. 2008

J Appl Cryst

View full text Add to dashboard Cite

show abstract

Piezo-, Pyro- and Ferroelectricity

Sirdeshmukh

Subhadra

2011

Atomistic Properties of Solids

View full text Add to dashboard Cite

Fresnoite: A new ferroelectric mineral

Foster

Arbogast

Nielson

et al. 1999

Journal of Applied Physics

View full text Add to dashboard Cite

Fresnoite, Ba2TiOSi2O7, has been predicted structurally to be a new ferroelectric. Detection of both ac and dc dielectric hysteresis verifies the prediction. The spontaneous polarization Ps estimated from the hysteresis at 1.2 MV m−1 ac is ∼0.2 C m−2 at 295 K, comparable with the minimum Ps observed in one-dimensional ferroelectrics. A reproducible calorimetric anomaly with entropy change 0.19(3) J mol−1 K−1 at 433(2) K in polycrystalline material coincides with a small dielectric and pyroelectric anomaly previously reported in single crystals; an entropy change ∼0.2 J mol−1 K−1 at 810(5) K also accompanies a dielectric anomaly observable in ceramic samples at 805(5) K. Both calorimetric anomalies are ∼60 K wide. Observation of dielectric hysteresis at 875 K shows that neither anomaly corresponds to the Curie temperature; both are likely associated with small changes in atomic position, not with symmetry changes. Melting onset in fresnoite is 1703(1) K with undercooling as deep as 435 K.

show abstract

PC based ferroelectric analyzer using modified sawyer and tower circuit

Cited by 4 publications

References 4 publications

Phase transitions and ferroelectricity in NaSb₃F₁₀

Phase transitions and ferroelectricity in NaSb₃F₁₀

Piezo-, Pyro- and Ferroelectricity

Fresnoite: A new ferroelectric mineral

Contact Info

Product

Resources

About

PC based ferroelectric analyzer using modified sawyer and tower circuit

Cited by 4 publications

References 4 publications

Phase transitions and ferroelectricity in NaSb3F10

Phase transitions and ferroelectricity in NaSb3F10

Piezo-, Pyro- and Ferroelectricity

Fresnoite: A new ferroelectric mineral

Contact Info

Product

Resources

About

Phase transitions and ferroelectricity in NaSb₃F₁₀

Phase transitions and ferroelectricity in NaSb₃F₁₀