Investigations on electrical conduction properties and crystallization conditions of V2O5-P2O5 glass based semiconductors

2013 ◽  
Vol 1494 ◽  
pp. 215-219
Author(s):  
Akifumi Matsuda ◽  
Takuya Aoyagi ◽  
Takashi Naito ◽  
Tadashi Fujieda ◽  
Kenjiro Ikejiri ◽  
...  
Keyword(s):  
High Vacuum ◽  
Potential Candidate ◽  
X Ray Diffraction ◽  
Melt Quenching ◽  
X Ray ◽  
Heat Treated ◽  
Crystallization Conditions ◽  
Quenching Method ◽  
Vanadate Glasses ◽  
Conduction Properties

ABSTRACTWe studied the electrical properties of thermally treated V2O5-CuO-Fe2O3-P2O5 (vanadate) glasses under reducing high-vacuum conditions. The glasses were prepared by using a melt-quenching method and then applied on Al2O3 substrates as ∼40μm-thick films. The glass films were then heat treated at 375−550°C under a vacuum of 10−6 Pa. Powder X-ray diffraction showed the formation of complex oxides of both MxV2O5 (M = Cu, Fe; x = 0.12−1.3) and vanadium oxides (VOx; x = 1.5−2.5). The resistivity of the glass film crystallized at 550°C measured at 50°C and 300°C were 1.8 × 100 Ωcm and 2.8 × 10−1 Ωcm, respectively, which was 10 times lower than that of the film crystallized in air. The Seebeck coefficient was −132 μV/K at 50°C and −130 μV/K at 300°C. These results show that the vanadate glasses crystallized under the appropriate condition become potential candidate materials for semiconductor and thermoelectric application.

Microstructure Characterization of the Reaction Interface between CBN Grain and Titanium-Deposited Film

2012 ◽  
Vol 538-541 ◽  
pp. 166-171
Author(s):  
Wen Feng Ding ◽  
Yang Min Liang ◽  
Jian He ◽  
Li Tang ◽  
Jie Yu ◽  
...  
Keyword(s):  
Heating Temperature ◽  
Cubic Boron Nitride ◽  
High Vacuum ◽  
Reaction Products ◽  
X Ray Diffraction ◽  
X Ray ◽  
Energy Dispersion Spectrometer ◽  
Heat Treated ◽  
Deposited Film

Cubic boron nitride (CBN) abrasive grains with surface titanium-deposited film were heat-treated during 550-950°C for 60 min under high vacuum circumstance. Detailed interfacial compounds analysis by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersion spectrometer (EDS), differential thermal analysis (DTA) indicates that the interfacial reactions are much dependent on the heating temperature to some extents, and the reaction products, TiN, TiB2 and TiB chiefly form the network structure. In particular, at 950°C the transition layers with excellent performance, CBN/TiB2/TiB/(TiB+TiN)/TiN/CBN, is realized.

The Preparation and Physical Characteristic of Sm3+ Doped Borotellurite Glass

2016 ◽  
Vol 846 ◽  
pp. 69-74 ◽  
Author(s):  
M.R.S. Nasuha ◽  
K. Azman ◽  
H. Azhan ◽  
S.A. Senawi ◽  
Mardhiah Abdullah
Keyword(s):  
Physical Properties ◽  
Molar Volume ◽  
Potential Candidate ◽  
X Ray Diffraction ◽  
X Ray ◽  
Prepared Glass ◽  
Amorphous Nature ◽  
Compositional Changes ◽  
Optical Applications ◽  
Quenching Method

Borotellurite glasses were generally applied in rare earth optical materials due to their excellent physical properties. Samarium doped borotellurite glasses have been identified as one of the potential candidate for optical applications. Therefore, the aim of this study is to identify the physical properties of Sm3+ doped borotellurite glasses by mean of their density, molar volume, microhardness and X-ray diffraction. In this study, the Sm3+ doped borotellurite glasses of the system (70-x)TeO2-20B2O3-10ZnO-xSm2O3 as the samarium trioxide varies from (x = 0.0, 0.5, 1.0, 1.5, 2.0 and 2.5 mol%) have been prepared by melt-quenching method. The amorphous nature of the prepared glass samples have been confirmed through XRD spectral analysis. The values of density are found to vary from 4.541g/cm3 to 4.837g/cm3 as well as the values of molar volume as it varies from 29.118cm3/mol to 28.314cm3/mol with the increase of Sm3+ content. The physical properties corresponding to compositional changes have been analysed and the result are reported and presented.

Thermoelectric Properties of Crystallized Vanadate Glasses Prepared by Using Microwave Irradiation

2012 ◽  
Vol 1454 ◽  
pp. 15-20 ◽  
Author(s):  
Takuya Aoyagi ◽  
Tadashi Fujieda ◽  
Yuichi Sawai ◽  
Motoyuki Miyata ◽  
Takashi Naito ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Microwave Irradiation ◽  
Thermoelectric Properties ◽  
Room Temperature ◽  
Conventional Heating ◽  
Potential Candidate ◽  
Melt Quenching ◽  
Quenching Method ◽  
Vanadate Glasses ◽  
Heated Glass

ABSTRACTThis study examined the crystallization of vanadate glasses by using microwave irradiation. A second aim was comparing the thermoelectric properties of crystallized glasses when using microwave irradiation to conventional heating. V2O5-P2O5-Fe2O3-CuO glasses were prepared by using the melt quenching method. These glasses were irradiated by 2.45-GHz microwaves and heated in an electric furnace. MxV2O5 (M= Cu, Fe x=0.26-055) crystals were selectively precipitated by using the microwave irradiation. The crystal growth was also promoted by it. As a result, precipitation crystals formed a fiber-like structure. The electrical conductivity of the microwave irradiated glass was 6.3×101S/m at room temperature, which was three times higher than the value of conventionally-heated glass. The Seebeck coefficient of the microwave irradiated glass was -127 μV/K at room temperature, which was two times higher than that of conventionally-heated glass. This caused the power factor to be improved about 12 times. These results show that microwave irradiation is a potential candidate for obtaining conductive crystallized vanadate glasses.

Superconducting Properties of Bi-Sr-Ca-Cu-O Crystallized Glass

1999 ◽  
Vol 13 (09n10) ◽  
pp. 985-989
Author(s):  
S. Chudinov ◽  
S. Stizza ◽  
B. Kościelska ◽  
L. Murawski ◽  
W. Sadowski ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Glass Ceramics ◽  
Superconducting Phase ◽  
Superconducting Transition ◽  
Resistive Transition ◽  
Superconducting Properties ◽  
X Ray Diffraction ◽  
Melt Quenching ◽  
X Ray ◽  
Quenching Method

This paper reports the crystallization and superconducting properties of Bi 4 Sr 3 Ca 3 Cu 4 O x glass-ceramics. The glass was prepared using the conventional melt-quenching method. X-ray diffraction pattern has shown that the annealing at temperature of 800°C converted the glass into glass-ceramics with Bi 2 Sr 2 CaCu 2 O x superconducting phase (2212-phase). The superconducing transition exhibits the change in the slope that is characteristic for two different superconducting phases. It is observed that T c (zero) increases from 20 K to 80 K with increasing time of annealing. The influence of magnetic field on the superconducting transition has been investigated. Our studies revealed a remarkable broadening of the resistive transition as a function of temperature with increasing field. The temperature width ( T c-T) of the transition for both phases increases with magnetic field according to Tinkham model.

Optical Absorption of Er3+/Nd3+ Co-Doped Tellurite Glass

2012 ◽  
Vol 501 ◽  
pp. 96-100 ◽  
Author(s):  
S. Akmar Roslan ◽  
M. Rahim Sahar ◽  
Ramli Arifin ◽  
Sib Krishna Ghoshal ◽  
M. Supar Rohani ◽  
...  
Keyword(s):  
Tellurite Glass ◽  
Optical Band Gap ◽  
Urbach Energy ◽  
Tellurite Glasses ◽  
X Ray Diffraction ◽  
Melt Quenching ◽  
X Ray ◽  
Diffraction Patterns ◽  
Quenching Method ◽  
Co Doped

Tellurite glasses of varying Er3+/Nd3+ concentration were successfully prepared by melt-quenching method. The X-Ray diffraction pattern was determined by using Siemens Diffractometer D5000 while the optical properties were measured using Shimadzu 3101 pc UV-VIS NIR scanning spectrophotometer. It was found that the diffraction patterns of all samples showed glasses characteristics. The optical band gap, Eopt¬ increased proportionally with the content of Er¬2O3 but Urbach energy, ∆E decreased due to the increasing Er2O3 contents.

scholarly journals Dielectric properties of bismuth titanate ceramics containing SiO2 and Nd2O3 as additives

2012 ◽  
Vol 6 (3) ◽  
pp. 117-122 ◽  
Author(s):  
Stanislav Slavov ◽  
Milena Krapchanska ◽  
Elena Kashchieva ◽  
Svetlin Parvanov ◽  
Yanko Dimitriev
Keyword(s):  
Room Temperature ◽  
Bismuth Titanate ◽  
Dielectric Materials ◽  
Dielectric Losses ◽  
X Ray Diffraction ◽  
Melt Quenching ◽  
X Ray ◽  
Quenching Method ◽  
Titanate Ceramics ◽  
Scanning Electron

Bismuth-titanate ceramics containing SiO2 and Nd2O3 as additives are synthesized by melt quenching method in the system Bi2O3-TiO2-Nd2O3-SiO2 in the temperature range of 1250-1500 ?C. The phase composition of the obtained materials is determined by X-ray diffraction analysis and energy dispersive spectroscopy. Using scanning electron microscopy different microstructures are observed in the samples depending on the composition. Different values of conductivity, dielectric losses and relative permittivity are obtained depending on the composition. It is established that all investigated samples are dielectric materials with conductivity between 10-9 and 10-13 (??cm)-1 at room temperature, dielectric permittivity from 1000 to 3000 and dielectric losses tg? between 0.0002 and 0.1.

scholarly journals X-Ray Diffraction and Raman Spectroscopic Studies of Glasses and Glass-Ceramics Inside the A2O-MoO3-Nb2O5-P2O5 (A= Li, Na) Systems

2010 ◽  
Vol 12 (3,4) ◽  
pp. 207
Author(s):  
H. Bih ◽  
L. Bih ◽  
M.P.F. Graça ◽  
M.A. Valente ◽  
B. Elouadi
Keyword(s):  
Glass Ceramics ◽  
Spectroscopic Studies ◽  
Phosphate Glasses ◽  
Molar Ratio ◽  
Thermal Treatments ◽  
X Ray Diffraction ◽  
X Ray ◽  
Raman Spectroscopic ◽  
Heat Treated ◽  
Quenching Method

<p>Phosphate glasses in the system (50-x)A<sub>2</sub>O-xMoO<sub>3</sub>-10Nb<sub>2</sub>O<sub>5</sub>-40P<sub>2</sub>O<sub>5</sub> (AMo-40), with x=0; 30 and A=Li or Na were prepared by the melt quenching method. The effect in the crystallization behaviour of the glass due to the introduction of MoO<sub>3</sub> in the glass composition and varying the molar ratio between network modifiers and network formers (M/F) was studied. The prepared glasses were heat-treated in air, at 550, 600 and 650 ºC for 4 hours. The structure, of the obtained samples, was studied by differential thermal analysis (DTA), X-ray powder diffraction (XRD), Raman spectroscopy and the morphology by scanning electron microscopy (SEM). It was found that the replacement of Li<sub>2</sub>O or Na<sub>2</sub>O by MoO<sub>3</sub> reduces the number of the crystallised phases. In the lithium-niobiophosphate glasses the presence of MoO<sub>3</sub> promotes the formation of NbOPO<sub>4</sub> and reduces the formation of ortho- and pyro-phosphate phases. The thermal treatments affect the arrangements of the network structure of the AMo-40-glasses.</p>

scholarly journals Eu3+, Tb3+- and Er3+, Yb3+-Doped α-MoO3 Nanosheets for Optical Luminescent Thermometry

Nanomaterials ◽  
2019 ◽  
Vol 9 (4) ◽  
pp. 646 ◽  
Author(s):  
Jing Liu ◽  
Rik Van Deun ◽  
Anna M. Kaczmarek
Keyword(s):  
Photoelectron Spectroscopy ◽  
Upconversion Luminescence ◽  
Luminescence Spectroscopy ◽  
Potential Candidate ◽  
X Ray Diffraction ◽  
X Ray ◽  
Sensing Applications ◽  
Transmission Electron ◽  
Heat Treated ◽  
Synthesis Approach

Here we report a novel synthesis approach for the preparation of α-MoO3:Ln3+ materials employing a two-step synthesis. Additionally, in this work the α-MoO3:Ln3+ materials are reported as potential optical thermometers for the first time. In this synthesis approach, first MoS2 2D nanosheets were prepared, which were further heat treated to obtain α-MoO3. These materials were fully characterized by powder X-ray diffraction (XRD), Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), X-ray fluorescence (XRF), thermogravimetry (TG) and differential thermal analysis (DTA), transmission electron microscopy (TEM), and luminescence spectroscopy. Temperature-dependent luminescence measurements were carried out to determine the optical thermometric properties of two different types of α-MoO3:Ln3+ materials (Eu3+/Tb3+ downshifting and Er3+/Yb3+ upconversion luminescence systems). We demonstrate in this study that this class of material could be a potential candidate for temperature-sensing applications.

scholarly journals Optical Properties of Erbium Doped Borotellurite Glass System

2015 ◽  
Vol 1112 ◽  
pp. 7-10 ◽  
Author(s):  
Mohamed Kamari Halimah ◽  
M.N. Azlan ◽  
S.Z. Shafinas
Keyword(s):  
Refractive Index ◽  
Optical Properties ◽  
Molar Volume ◽  
X Ray Diffraction ◽  
Melt Quenching ◽  
X Ray ◽  
Erbium Doped ◽  
Amorphous Nature ◽  
Quenching Method ◽  
Xrd Method

Erbium doped zinc borotellurite glasses were prepared by using melt-quenching method. The structural properties of the glass samples were determined by using x-ray diffraction (XRD) method and was confirmed its amorphous nature. The density and molar volume is shown to be increased with increasing content of erbium. The refractive index is found to be increased with increasing content of erbium.

Influence of NiO Nanoparticles on Magnetic Properties of Neodymium Doped Tellurite Glasses

2017 ◽  
Vol 268 ◽  
pp. 102-105 ◽  
Author(s):  
Md Rahim Sahar ◽  
Nur Amanina Mat Jan
Keyword(s):  
Room Temperature ◽  
X Ray Diffraction ◽  
Initial Curve ◽  
Melt Quenching ◽  
X Ray ◽  
Transmission Electron ◽  
Amorphous Nature ◽  
Quenching Method ◽  
Nio Nps ◽  
The Magnetic Field

Series of glass samples with composition (72.5-x)TeO2-15MgO-10Na2O-2.5Nd2O3-xNiO where 1.0 ≤ x ≤ 2.5 mol% are prepared using melt quenching method. The glasses are characterized via X-ray diffraction (XRD), transmission electron microscopy (TEM) and vibrating sample magnetometer (VSM). The XRD spectra confirmed the amorphous nature of prepared glasses. TEM images manifest the existence of NiO NPs which are homogeneously distributed in the glass matrix. The magnetization M(H) curve reveals that the glass displays an anomalous hysteresis behavior at room temperature. It is observed that M(H) is dependent on the NiO content. The initial curve of magnetization lies positively as a function of the magnetic field under 1000 H (O.e).

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