Large electrocaloric effect near room temperature in lead–free Bi0.5Na0.5TiO3-based ergodic relaxor observed by differential scanning calorimetry

Abstract The possible interactions between oligoamidephosphate (OAPli) and the curatives of a sulphenamide-accelerated sulphur vulcanizing system were studied by differential scanning calorimetry, IR-spectroscopy, and X-ray analysis. The interactions in double mixtures were between OAPh and zinc oxide (ZnO) and OAPh and sulphur. The OAPh/ZnO interaction that starts at room temperature seems to be the key for understanding the peculiarities of sulphenamide-accelerated sulphur vulcanization in the presence of OAPh.

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Influence of Gd Addition on the Structure and Capability of Ni-Mn-In Metamagnetic Shape Memory Alloys

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.535-537.950 ◽

2012 ◽

Vol 535-537 ◽

pp. 950-953

Author(s):

Li Na Bai ◽

Gui Xing Zheng ◽

Zhi Jian Duan ◽

Jian Jun Zhang

Keyword(s):

Differential Scanning Calorimetry ◽

Magnetic Properties ◽

Magnetic Property ◽

Transition Temperature ◽

Martensitic Transformation ◽

Room Temperature ◽

Vibrating Sample Magnetometry ◽

X Ray Diffraction ◽

Scanning Calorimetry ◽

X Ray

The influences of Gd concentration on martensitic transformation and magnetic properties of NiMnIn alloys were investigated by differential scanning calorimetry (DSC) , vibrating sample magnetometry (VSM), X-ray diffraction (XRD) and etc. It is Observed through the experiment: the addition of Gd enhances martensite transition temperature;X-ray diffraction analysis of experimental alloys is revealed that to the mixture is martensite and austenite at room temperature; content of Gd is not proportional to the improvement of magnetic property.

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Enhanced electrocaloric effect in lead-free organic and inorganic relaxor ferroelectric composites near room temperature

Applied Physics Letters ◽

10.1063/1.5028459 ◽

2018 ◽

Vol 112 (19) ◽

pp. 193902 ◽

Cited By ~ 12

Author(s):

Haibibu Aziguli ◽

Xin Chen ◽

Yang Liu ◽

Guang Yang ◽

Ping Yu ◽

...

Keyword(s):

Room Temperature ◽

Relaxor Ferroelectric ◽

Lead Free ◽

Electrocaloric Effect

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Study of thermal properties of Ga0.5In1.5Se3 by differential scanning calorimetry

Modern Physics Letters B ◽

10.1142/s0217984921504078 ◽

2021 ◽

pp. 2150407

Author(s):

S. I. Ibrahimova

Keyword(s):

Crystal Structure ◽

Differential Scanning Calorimetry ◽

Thermal Properties ◽

Thermal Effects ◽

Room Temperature ◽

Structural Studies ◽

X Ray Diffraction ◽

Hexagonal Symmetry ◽

Scanning Calorimetry ◽

X Ray

The crystal structure and thermal properties of the [Formula: see text] compound have been investigated. Structural studies were performed by X-ray diffraction at room temperature. The crystal structure of this compound was found to correspond to the hexagonal symmetry of the space group P61. Thermal properties were studied using a differential scanning calorimetry (DSC). It was found in the temperature range [Formula: see text] that thermal effects occur at temperatures [Formula: see text] and [Formula: see text]. The thermodynamic parameters of these effects are calculated.

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Study of Application of Thermal Infrared Camouflage Materials in the National Defense Engineering

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.651-653.107 ◽

2014 ◽

Vol 651-653 ◽

pp. 107-110

Author(s):

Nai Yan Zhang ◽

Jun Liu

Keyword(s):

Differential Scanning Calorimetry ◽

Glass Transition ◽

Room Temperature ◽

Polymer Network ◽

Thermal Infrared ◽

Interpenetrating Polymer Network ◽

National Defense ◽

Scanning Calorimetry ◽

Response To Temperature ◽

Infrared Camouflage

In this paper, a series of semi-interpenetrating polymer network materials based on poly ((2-dimethylamino) ethyl methacrylate)/poly (N, N-diethylacrylamide) (PDMAEMA/PDEA) were synthesized at room temperature. The influence of this additive on the property of resulting PDEA materials was investigated and characterized. The glass transition temperature (Tg) of the semi-IPN materials was observed by Differential Scanning Calorimetry (DSC). Compared to PDEA, the semi-IPN materials exhibited excellent mutative values in response to an alternation of the temperature, and showed fast swelling and deswelling rates in response to temperature change, which suggests that these materials have potential application as thermal infrared camouflage materials.

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Evidence for room temperature mesomorphism in a mixed-valent diruthenium(II,III) quintapalmitoleate polymer

Canadian Journal of Chemistry ◽

10.1139/v98-105 ◽

1998 ◽

Vol 76 (11) ◽

pp. 1520-1523

Author(s):

Jennifer F Caplan ◽

Christopher A Murphy ◽

Susan Swansburg ◽

Robert P Lemieux ◽

T Stanley Cameron ◽

...

Keyword(s):

Differential Scanning Calorimetry ◽

Liquid Crystal ◽

Powder Diffraction ◽

Strong Evidence ◽

Room Temperature ◽

Variable Temperature ◽

Mixed Valence ◽

Scanning Calorimetry ◽

X Ray ◽

Crystal Transition

The synthesis of Ru2(μ-O2CR)4(μ´-O2CR) (1), R = -CH2(CH2)6CH=CH(CH2)5CH3, has been achieved and characterization using elemental analysis and FTIR and UV-Vis spectroscopies undertaken. Strong evidence for a hexagonal discotic mesophase has been found using differential scanning calorimetry, variable-temperature polarizing optical microscopy, and X-ray powder diffraction. A solid to liquid crystal transition was found upon heating at 128°C and the mesophase is found to persist to room temperature upon cooling from 150°C. This is the first report of room temperature mesomorphism in a mixed-valent metallomesogen. Key words: ruthenium carboxylate, liquid crystal, metallomesogen, mixed valence, polymer.

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Large room-temperature electrocaloric effect in lead-free BaHf Ti O3 ceramics under low electric field

Acta Materialia ◽

10.1016/j.actamat.2016.05.044 ◽

2016 ◽

Vol 115 ◽

pp. 58-67 ◽

Cited By ~ 82

Author(s):

Junning Li ◽

Dawei Zhang ◽

Shiqiang Qin ◽

Tangyuan Li ◽

Ming Wu ◽

...

Keyword(s):

Electric Field ◽

Room Temperature ◽

Lead Free ◽

Electrocaloric Effect

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Structural and dielectric properties of Bi2NbxVi−xO5.5 ceramics

Journal of Materials Research ◽

10.1557/jmr.1996.0291 ◽

1996 ◽

Vol 11 (9) ◽

pp. 2288-2292 ◽

Cited By ~ 14

Author(s):

K. B. R. Varma ◽

K. V. R. Prasad

Keyword(s):

Differential Scanning Calorimetry ◽

Grain Size ◽

Dielectric Properties ◽

Curie Temperature ◽

Room Temperature ◽

Dielectric Constants ◽

Scanning Calorimetry ◽

Electron Microscopic ◽

Scanning Electron Microscopic ◽

Scanning Electron

Bi2Nbx V1−xO5.5 ceramics with x ranging from 0.01 to 0.5 have been prepared. The crystal system transforms from an orthorhombic to tetragonal at x 3= 0.1 and it persists until x = 0.5. Scanning electron microscopic (SEM) investigations carried out on thermally etched Bi2NbxV1−xO5.5 ceramics confirm that the grain size decreases markedly (18 μm to 4 μm) with increasing x. The shift in the Curie temperature (725 K) toward lower temperatures, with increasing x, is established by Differential Scanning Calorimetry (DSC). The dielectric constants as well as the loss tangent (tan δ) decrease with increasing x at room temperature.

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