Electric and Optical Properties of Pb(Er1/2Nb1/2)-Pb(Mg1/3Nb1/3)-PbTiO3 Crystals

New ferroelectric crystals Pb(Er1/2Nb1/2)-Pb(Mg1/3Nb1/3)O-PbTiO3 (PEN-PMN-PT) were grown by using the flux method. Phase structure of the crystals was described by the X-ray diffraction analysis. Dielectric, ferroelectric and optical properties of the PEN-PMN-PT crystals were investigated systematically. Higher Curie temperature (Tc ~ 291 °C) and larger coercive field (Ec ~ 17.6 kV/cm) for the 40PEN-13PMN-47PT can be obtained, respectively, compared with those of the PMN-PT. Moreover, strong green and red emissions can be excited by using the 980 nm laser. The PEN-PMN-PT crystals with these performances have some promising applications in the electromechanical and optical devices.

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Investigation of the Phase Structure of Tm2CrFe13Si3 Compound by Differential Thermal/Thermotravimetric Analyzer

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.580.513 ◽

2012 ◽

Vol 580 ◽

pp. 513-516

Author(s):

Yan Zhao Wu ◽

Fei Fei Liang ◽

Kai Ping Zheng ◽

Huai Gu Hu ◽

Yan Ming Hao

Keyword(s):

Curie Temperature ◽

Phase Structure ◽

Nitrogen Absorption ◽

X Ray Diffraction ◽

X Ray ◽

Thermogravimetric Analyzer ◽

Curie Temperature Tc

The phase structure and magnetic were investigated by means of x-ray diffraction and differential thermal /thermogravimetric analyzer. The result showed that nitrogenized reaction started at 140oC with little nitrogen diffused into Tm2CrFe13Si3 compound. The nitrogen absorption of the Tm2CrFe13Si3 compound was most violent at 700oC, and its Curie temperature TC increased obviously. As the temperature increased continually, part of the Tm2CrFe13Si3 compound decomposed into TmN compound and α-Fe.

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Growth and Magneto-Optical Properties of CaTbAlO4 Crystal

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.306-307.1722 ◽

2011 ◽

Vol 306-307 ◽

pp. 1722-1727 ◽

Cited By ~ 2

Author(s):

Man Mei ◽

Li Li Cao ◽

Yan He ◽

Ru Ru Zhang ◽

Fei Yun Guo ◽

...

Keyword(s):

Optical Properties ◽

Single Crystal ◽

Room Temperature ◽

Near Infrared ◽

Visible Region ◽

Czochralski Method ◽

Optical Devices ◽

X Ray Diffraction ◽

X Ray ◽

Infrared Spectral

The calcium terbium aluminate (CaTbAlO4) single crystal was grown by Czochralski method successfully for the first time.The structure of the crystal was determined by X-ray diffraction analysis.The transmission spectrum of the crystal was measured at room temperature at the wavelength of 400-1500nm.The specific Faraday rotation of the single crystal was surveyed at room temperature at the wavelength 532nm, 633nm, and 1064nm respectively.The Verdet constants of the CaTbAlO4 crystal are calculated and the results show that the Verdet constants of CaTbAlO4 are around 110% higher than that of TGG in the visible and near-infrared spectral region.Therefore,crystal CaTbAlO4 can be promising material for the fabrication of magneto-optical devices in the visible region.

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Effects Of Cd On Physical And Some Magnetic Properties Of Co-Cd Ferrites

Journal of Bangladesh Academy of Sciences ◽

10.3329/jbas.v35i2.9429 ◽

1970 ◽

Vol 35 (2) ◽

pp. 229-235 ◽

Cited By ~ 2

Author(s):

Saroaut Noor ◽

SS Sikder ◽

M Samir Ullah ◽

MA Hakim ◽

Shireen Akhter

Keyword(s):

Curie Temperature ◽

Lattice Parameter ◽

Initial Permeability ◽

X Ray Diffraction ◽

Ceramic Method ◽

X Ray ◽

Cobalt Ferrites ◽

Vegard’S Law ◽

Ray Density ◽

Curie Temperature Tc

Polycrystalline samples of Cd substituted cobalt ferrites with composition Co1-xCdxFe2O4 (x = 0.0- 0.6 in steps of 0.1) were prepared by double sintering ceramic method. The samples were sintered at 1050°C for 3 hours. X-ray diffraction pattern of the samples showed single phase cubic spinel structure. It was found that the lattice parameter increases linearly with increasing Cd content following Vegard’s law. The apparent density and X-ray density exhibited similar behavior. The Curie temperature Tc has been determined from the temperature dependence of permeability. It was found that the Curie temperature continuously decreased with increasing Cd content and is attributed to the weakening of JAB exchange interaction. The initial permeability, μ' increases with increasing Cd content up to x = 0.6 and then decreases. Key words: Co-Cd ferrite; Lattice parameter; Permeability DOI: http://dx.doi.org/10.3329/jbas.v35i2.9429 JBAS 2011; 35(2): 229-235

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Ferroelectric Transition in Sr- and W-Doped BaTiO3 Solid Solutions

Applied Sciences ◽

10.3390/app11156760 ◽

2021 ◽

Vol 11 (15) ◽

pp. 6760

Author(s):

Heeju Ahn ◽

Eunjeong Lee ◽

Yujin Cho ◽

Dongyeon Bae ◽

Hee Jung Park ◽

...

Keyword(s):

Crystal Structure ◽

Solid State ◽

Curie Temperature ◽

Solid State Reaction Method ◽

X Ray Diffraction ◽

Reaction Method ◽

X Ray ◽

Lattice Constants ◽

A Value ◽

Curie Temperature Tc

We synthesized Sr- and W-doped BaTiO3 (BTO) polycrystals by using a solid-state reaction method. The X-ray diffraction results showed that Sr and W atoms occupied the Ba and Ti sites in tetragonal BTO, respectively, and there were changes in the lattice constants and the volumes in the Sr- and W-doped BTO. We found a change in the latent heat and the Curie temperature (TC) during the transition between the ferroelectric and paraelectric phases while increasing the contents of Sr and W in the Sr- and W-doped BTO. This can be explained by the fact that the doping of Sr and W atoms in BTO prevented a distinct transition between the ferroelectric tetragonal and paraelectric cubic structures by decreasing the c/a ratio to a value close to unity. This study shows a way toward a strategy for modulating a crystal structure by using proper dopants for future applications in ferroelectricity-based devices.

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Piezoelectric and Dielectric Properties of MnO2-Modified Bi(Mg1/2Ti1/2)O3–PbTiO3

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.415-417.1983 ◽

2011 ◽

Vol 415-417 ◽

pp. 1983-1987

Author(s):

Xiao Na Wang ◽

Qing Chi Sun ◽

Wei Bing Ma ◽

Tao Liu ◽

Yong Zhang ◽

...

Keyword(s):

Dielectric Properties ◽

Curie Temperature ◽

Room Temperature ◽

Piezoelectric Properties ◽

High Curie Temperature ◽

X Ray Diffraction ◽

X Ray ◽

Stable Temperature ◽

Curie Temperature Tc ◽

Dielectric And Piezoelectric Properties

We reported that Bi(Mg1/2Ti1/2)O3–PbTiO3(BMT-PT) systems had high piezoelectric, dielectric performances and high Curie temperature. The phase structure of the system was identified by X-ray diffraction analysis. The piezoelectric and dielectric properties were also investigated. The results showed that 0.6BMT–0.4PT (Mg/Ti = 0.5:0.5) with 1mol% MnO2was the optimum composition which exhibited the highest curie temperature Tc = 511 °C and the stable temperature of dielectric loss reached to 500 °C. Further, the dielectric and piezoelectric properties of this composition were given as follows:kp = 22.5%;εr= 734; room temperature d33= 131.3 pC/N; tanδ = 1.96%.

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Structural and Fluorescence Properties of TiO2/Ag Nanoparticles Bilayers

Diyala Journal for Pure Science ◽

10.24237/djps.17.03.557c ◽

2021 ◽

Vol 17 (3) ◽

pp. 55-70

Author(s):

Mohammed Kadhum ◽

Tahseen Mubarak ◽

Nadia Jassim

Keyword(s):

Titanium Dioxide ◽

Optical Properties ◽

Diffraction Analysis ◽

Glass Slide ◽

Hybrid Nanoparticles ◽

Growth Media ◽

Fluorescence Measurement ◽

X Ray Diffraction ◽

X Ray ◽

Crystal System

The optical properties of the TiO2 / Ag hybrid nanoparticles were improved as the particles were prepared with a pulsed liquid laser ablation (PLAL) technology. The effect of number of pulses (450) on the structural and optical properties of nanoparticles prepared in distilled water (DW) as growth media was examined using a Q-Switched Nd-YAG laser with wavelength (1064 nm), ablation energy (530 mJ) and repetition rate (1Hz). The distance between the target and the lens (10 cm). Several were used for the diagnosis such as X-ray diffraction analysis, fourier infrared transformations, TEM assays and fluorescence of the prepared samples. The results of X-ray diffraction analysis of the silver nanoparticles deposited on a glass slide showed that the crystal system is cubic and polycrystalline, with the direction being dominated by [111] at the level of the crystals. The results of X-ray diffraction analysis of a solution of titanium dioxide nanoparticles deposited on a glass slide revealed the presence of a quadrangular crystal system, indicating the presence of titanium dioxide particles in (rutile), and that the prevailing trend for crystalline levels is [110]. The functional groups of (TiO2 / Ag) were determined in the liquid medium by the (FTIR) technique. Also, TEM images showed the presence of nanoparticles and microparticles in an almost spherical shape. The fluorescence measurement of (TiO2 / Ag) hybrid particles showed that through the graph the peak values of (284.1) and (418.3) nm. This is roughly identical to the absorption spectrum results of a hybrid silver and titanium dioxide nanoparticle solution.

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DyP5O14

Acta Crystallographica Section E Structure Reports Online ◽

10.1107/s1600536807008410 ◽

2007 ◽

Vol 63 (3) ◽

pp. i89-i91 ◽

Cited By ~ 3

Author(s):

Fathia Chehimi-Moumen ◽

Mokhtar Férid

Keyword(s):

Single Crystal ◽

Diffraction Analysis ◽

Three Dimensional ◽

X Ray Diffraction ◽

Flux Method ◽

X Ray ◽

Atomic Arrangement ◽

Twofold Axis ◽

Dimensional Network

Single-crystal X-ray diffraction analysis has been performed on dysprosium ultraphosphate, DyP5O14, prepared by the flux method. The atomic arrangement is built up of layers of independent P8O24 rings perpendicular to the b axis interconnected by PO4 groups to form a three-dimensional network of PO4 tetrahedra. Two sites are located on the twofold axis for the Dy atoms, which have almost regular dodecahedral coordination.

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Analysis of Microstructure of Phosphate Cement

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.284-286.2366 ◽

2011 ◽

Vol 284-286 ◽

pp. 2366-2369

Author(s):

Sha Long ◽

Yan Tong ◽

Fu Xuan Shen ◽

Hong Ke Ai ◽

An Hou Long

Keyword(s):

Diffraction Analysis ◽

Phase Structure ◽

Close Relation ◽

Infrared Spectrophotometry ◽

X Ray Diffraction ◽

Differential Heat ◽

X Ray ◽

Phosphate Phase ◽

Cement Setting ◽

Electronic Microscope

The mechanism for phosphate cement hydraulic reaction is determined. The microscopic process is described by means of scanning electronic microscope, X-ray diffraction analysis,infrared spectrophotometry and differential heat analysis. The results show the three main phases are present, i.e. hydromagnesium phosphates, Mg (OH)2and MgO phase. The type, structure, and amount of every phase play an important role in phosphate cement properties. Hydromagnesium phosphate phase structure has a close relation to phosphate cement setting and hardening. The development of strength has much to do with the formed crystalline directing.

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