Influence Of Bi2O3 Research Articles

Optical parameters and gamma shielding quality of sodium-borate glasses: The relative contribution of Bi2O3, SrO, and Li2O

The optical quality and compositional flexibility of borate glasses make them attractive materials for optical applications, nuclear waste containment, transparent radiation shields and many other applications in the nuclear and allied industries. This study presents the physical, optical, and gamma transmission data of the sodium borate glass structure: 75B2O3 – 15Na2O – 9.5x – 0.5Nd2O3; for x = Bi2O3 (BiNd), SrO (SrNd), and Li2O (LiNd). The glasses were prepared using the traditional melt-and-quench technique. The influence of Bi2O3, SrO, and Li2O on the physical attributes, optical constants, and gamma radiation interaction coefficients was probed using standard laboratory procedures and software. The density of BiNd, SrNd, and LiNd was 3.32, 2.43, and 2.24 g/cm3, respectively. The molar volume of the glasses followed the trend: BiNd > SrNd > LiNd. The optical constants of the glasses, such as refractive index, metallization criterion, molar refractivity, molar polarizability, reflectance loss, and optical transmission, showed a wide fluctuation with respect to glass composition. The values of the gamma mass attenuation coefficients for 15 keV–15 MeV photons were in the range 0.0316–45.0225 cm2/g for BiNd, 0.0206–5.4940 cm2/g for SrNd, and 0.0184–3.4603 cm2/g for LiNd. Generally, density has a positive correlation with the gamma absorption prowess of the investigated xNd glasses. A correlation between the optical and shielding parameters was highlighted in this study. The xNd glasses, especially SrNd and BiNd, are preferred as transparent radiation protection barriers, in contrast to some conventional Pb-based glasses, from environmental and public health perspectives. This glass composition is therefore unique and its properties are essentially useful in optical and radiation technologies.

Influence of Bi2O3, PbO, and Y2O3 nanofillers on the physical features of polyvinyl chloride: materials for optoelectronics or dielectric applications

Influence of Bi2O3, PbO, and Y2O3 nanofillers on the physical features of polyvinyl chloride: materials for optoelectronics or dielectric applications

Insights into the influence of Bi2O3 on the structural and optical characteristics of novel Bi2O3–B2O3–TeO2–MgO–PbO glasses

Insights into the influence of Bi2O3 on the structural and optical characteristics of novel Bi2O3–B2O3–TeO2–MgO–PbO glasses

INVESTIGATION OF THE PHASE FORMATION PROCESS
 DURING THE SYNTHESIS OF CERAMIC MATERIALS
 BASED ON MODIFIED YTTRIUM MANGANITE

The aim of this work is to establish the nature and sequence of phase formation processes in the synthesis of ceramic
 materials based on yttrium manganite using different manganese oxides and structure modifiers. Differential scanning calorimetry,
 X-ray phase analysis, and scanning electron microscopy were used as research methods in the work. The physicochemical
 and electrophysical properties of the obtained samples were determined. Samples of modified yttrium manganite
 were obtained by solid-phase sintering of the initial components at various temperature-time parameters of heat treatment.
 The influence of Bi2O3, CoO and TeO2 additives on the physicochemical and electrophysical properties of prototypes was
 studied. Regularities of the structure formation processes and phase composition of ceramic materials are established in
 relation to the composition of raw materials and the technological parameters of the synthesis of modified yttrium manganite.
 It has been established that the addition of oxides of the RO type contributes to a decrease in the degree of crystallization
 of the samples, as evidenced by a decrease in the intensity of the diffraction peaks of the crystalline phases. In this case,
 the qualitative composition of the phases practically does not change, but the proportion of the amorphous component in the
 structure of the material increases. Bi2O3 has the most effective modifying effect in the synthesis of yttrium manganite.
 Its addition into the composition of the raw mixture intensifies the process of formation of the yttrium manganite phase with
 a crystal size of 2–4 μm, which is confirmed by the results of DSC, XRD, and electron microscopy. The intensification of the
 crystallization process due to the addition of bismuth oxide is explained by the developed mechanism of liquid-phase sintering
 and the formation of a significant number of crystallization centers. The developed ceramic materials based on modified
 yttrium manganite have a set of electrophysical characteristics that make it possible to recommend them for the manufacture
 of various elements of electronic technology.

The influence of Bi2O3 on structural and enhancing physical properties of Li2O–Fe2O3–In2O3–P2O5 glasses

Glasses based on the Li2O–Fe2O3–In2O3–Bi2O3–P2O5 system were prepared as potential low-melting sealing glasses. The modifications of the glass structure were characterized by means of XRD and FTIR spectroscopy as a function of Bi2O3/P2O5 substitutions. The bulk density, together with other parameters, was also calculated. The amorphous nature was observed for all glass samples except the highest Bi-content. FTIR and Raman spectrum reveal that the prompt polymerization of the phosphate chains by increasing the Bi2O3 content and forming P–O–Bi bonds and the existence of different structural groups FeO6, FeO4, BiO6, PO4, PO3 and PO. The dilatometry measurements showed an increase in both transition (Tg) and softening (Ts) temperatures with Bi-content. Conversely, coefficients of thermal expansion decreased from 120 × 10−7/°C to 80 × 10−7/°C. The dissolution rate of the prepared glasses was tested, and the results showed significantly improved glass stability. Finally, the obtained glasses have a suitable working temperature, suitable thermal expansion values, and good thermal and chemical stability, making them a prospective candidate for low-temperature sealing materials.

The Relationship between the Structure and Thermal Properties of Bi2O3-ZnO-B2O3 Glass System

The influence of Bi2O3 and melting temperature on the thermal and structural properties of xBi2O3-(60-x) ZnO-40B2O3 glasses has been investigated in this study. It is expected that these factors can be used to control the degree of reduction of Bi2O3, and the relationship between these factors and the color change of the process for bismuth glass is discussed. Due to high-temperature melting, the bismuth-doped borate glasses have changed into dark/black from original transparent yellow and the light transmittance will decrease, so it is not used in optical applications. The thermal properties of glass are measured by a thermomechanical analyzer (TMA), and the glass structure is analyzed by FTIR and XPS. The results show that the glass is mainly composed of [BiO6] octahedron, [BiO3] triangle, [BO4] tetrahedron, and triangle [BO3] units, and the network of the glass system is mainly bonded by B-O-B, B-O-Zn, B-O-Bi, and Bi-O-Bi. The glass thermal expansion coefficient (CTE) of this glass system increases with the increase of Bi2O3 content, and the O1s nuclear electron binding energy shifts to the lower energy direction with the increase of Bi2O3 addition. In terms of FTIR, as the melting temperature rises, the B-O-B bonding vibration concentration of [BO4] inside the borate glass decreases, and the density of B-O-B bonding vibration of [BO3] increases, Moreover, the increase in melting temperature increases the probability of reducing Bi ions to Bi0, reduces the bonding of Bi-O-B, and increases the bonding of B-O-B, and the CTE also slightly decreases.

Effect of bismuth oxide on the thermal storage performance of carbonate/magnesium oxide composite

As high temperature thermal energy storage materials, Na2CO3/MgO composites have been investigated extensively. However, theirs thermophysical properties, especially thermal conductivities, need improvements to satisfy the requirements for further efficiency in energy storage system. In this paper, Bi2O3 was tried and doped into the Na2CO3/MgO composites and the possible influence of Bi2O3 on the thermal properties of the composites was investigated for the first time. Our purpose is to achieve thermal performance optimization of these composites. Depending upon SEM, DSC techniques, a detailed analysis on possible relations between thermal properties, including both thermal enthalpy and conductivity, and sintering technique was carried out in this paper. The obtained results suggested that Bi2O3 is an effective additive, which can enhance thermal conductivities of the composites significantly. With the added amount of Bi2O3 as 1-3 wt%, the thermal conductivity value could be increased from 2 to 3.5 W/(m·K) with variety in enthalpy value controlled less than 5% for the sample prepared at 830–840 °C with the ratio of Na2CO3 to MgO as 50:50.

Synthesis of lithium zinc ceramics with a high saturation magnetization and a low ferromagnetic resonance line-width via two-step sintering strategy using low temperature co-fired ceramic technology

Abstract Lithium zinc ferrite (Li0·435Zn0·26Mn0·06Ti0.1BiyFe2.155-yO4) with a high saturation magnetization (Ms) and a low ferromagnetic resonance line-width ( Δ H ) was successfully synthesized by Low Temperature Co-Fired Ceramic (LTCC) technology using a two-step sintering strategy. In the pre-sintering stage, the optimal amount of active agent (Bi2O3) was added to LiZnMnTi ferrite to reduce reaction activation energy and promote grain growth at low temperature. SEM revealed that active agent effectively reduced critical sintering temperature to 920 °C and promoted grain growth at low temperature. During the final sintering process, various amount of V2O5 additive was added to make up the defect of asymmetrical grain growth caused by imbalances between grain growth and boundary diffusion from the influence of Bi2O3. It not only further promoted grain growth, but also greatly improved grain uniformity, reduced defects and increased material density. Finally, LiZnMnTi ferrite with a high Ms (353 kA/m), a low Δ H (182Oe), and a large average grain size (∼8 μm) was successfully synthesized by adding an optimal amount of V2O5 (0.6 wt%).

Influence of Bi2O3, TiO2 Additives and Sintering Process on the Performance of ITO Target Based on Normal Pressure Sintering Method

ABSTRACTThe effects of sintering temperature, heating rate, holding time and sintering additive on the properties of single-phase indium tin oxide (ITO) target, prepared by normal pressure sintering method, were studied systematically. The results showed that target sintered at 1550°C for 10 h with a heating rate of 9°C/min had a higher relative density of 98.7% and a lower resistivity of 4×10–4 Ω.cm. When bismuth trioxide (Bi2O3) was added as a sintering additive, the density of target prepared at 1450°C improved significantly from 87.15% to 93.17%, while the resistivity increased to 73.65×10–4 Ω.cm due to poor electrical conductivity of Bi2O3. Moreover, after adding titanium dioxide (TiO2) as sintering additive, density of the target sintered at 1450°C improved from 87.15% to 91.43%. Importantly, the resistivity reached the minimum value of 3.05×10–4 Ω.cm at 1550°C.

Influence of Bi2O3 on the physical and electrical properties of some Boro-Iron glasses

The rapid quenching method was used to prepare some of Bismuth Boro-Iron glasses doped with a constant amount of iron ions. The melting temperature adjusted to be about 1000±50°C. The obtained glasses were characterized by X-ray diffraction (XRD), FTIR and Mossbauer Effect (ME) spectra. Both of XRD and ME showed that all samples of x<15 had formed pure glass phases, while the sample of x=15 exhibited crystalline phase embedded in an amorphous structure. DC activation energy was observed to increase as Bi content increase. Cole-Cole parameters referred to a distribution of the relaxation time. The refractive index as the Bi ion was increased.

The crystallization kinetics of the MgO–Al2O3–SiO2–TiO2 glass ceramics system produced from industrial waste

In this study, the influence of Bi2O3 on the crystallization kinetics of the MgO–Al2O3–SiO2–TiO2 glass ceramics system produced from industrial waste was investigated. The Bi2O3-added MgO–Al2O3–SiO2–TiO2 glass ceramics systems were prepared by melting method. The crystallization behaviour and crystallization kinetics of a sample with glass ceramic composition were examined. DTA and XRD analysis revealed the crystallization of Ca0.965Mg2Al16O27 cordierite (Mg2Al4Si5O18) and Fe2TiO5 phases. The activation energy for the crystallization of cordierite phase has been evaluated, and the crystallization mechanism has been studied by applying DTA measurements taken at various heating rates. The results indicate that the dominant crystallization mechanism for this system is bulk crystallization dominated by three-dimensional growth. At 2.5, 5 and 10% Bi2O3 addition, the crystallization activation energy was calculated to be 336 ± 4, 218 ± 1 and 170 ± 3 kJ mol−1, and the viscous flow activation energy was measured to be 377 ± 2, 403 ± 7 and 407 ± 21 kJ mol−1, respectively.

The Influence of Bi&lt;sub&gt;2&lt;/sub&gt;O&lt;sub&gt;3&lt;/sub&gt; on SiO&lt;sub&gt;2&lt;/sub&gt;-Al&lt;sub&gt;2&lt;/sub&gt;O&lt;sub&gt;3&lt;/sub&gt;-B&lt;sub&gt;2&lt;/sub&gt;O&lt;sub&gt;3&lt;/sub&gt;-RO Glass Propertiesarts

In the paper, regarded SiO2-Al2O3-B2O3-RO system as basic composition, high-temperature glass glaze was prepared successfully by using Bi2O3 in place of Al2O3, and traditional melt annealing method was adopted .The influence of Bi2O3 on expansion coefficient, sintering temperature, electrical resistivity was investigated by DIL-2008, SJY sintering imager, Keythley2410. The results show that the sintering temperature of glass glaze has a wide range, which can reach 270°C, so it is easy to sinter; with the increasing of bismuth oxide content, expansion coefficient of glass glaze gradually increases, whereas sintering temperature and electrical resistivity continuously decreases.

Effect of Bi Content on the Dielectric Property of SBN Ceramics Prepared by Spark Plasma Sintering

SrBi2Nb2O9 (SBN) with different Bi2O3 contents were prepared by solid-state reaction method and then spark plasma sintering. The Influence of Bi2O3 on the properties of SBN was studied. The results showed that the increased Bi2O3 contents can enhance densification and improve the dielectric properties. This might have close relation to the low melting point of Bi2O3 and special sintering way of SPS, which usually results in some change in micro-structure.

Influence of Bi2O3 on microstructure and electrical properties of ZnO-SnO2 ceramics

The effects of small amounts (0.5; 1.0 and 1.5 mol. %) of bismuth oxide on the microstructure and electrical properties of ZnO-SnO2 ceramics have been studied. Starting powders of ZnO and SnO2 were mixed in the molar ratio 2:1. After adding Bi2O3 this mixture was mechanically activated for 10 minutes in a planetary ball mill, uniaxially pressed and sintered at 1300?C for 2h. The phase composition of the sintered samples was analyzed by X-Ray Diffraction (XRD) and by Energy Dispersive Spectrometer (EDS). Morphologies were examined by Scanning Electron Microscopy (SEM). An Impedance/Gain Phase Analyzer (HP 4194A) was used to measure the impedance spectra (100Hz - 10MHz) at different temperatures. The electrical DC resistivity/conductivity at different temperatures was measured using a High Resistance Meter (HP 4329A).

Influence of Bi2O3 on sintering and crystallization of cordierite ceramics

The influence of Bi2O3 on the process of cordierite ceramics preparation, 2MgO-2Al2O3-5SiO2 (MAS) was investigated. The following binary systems were used for the presented research: MgO/Bi2O3 (sintered at 820?C and 1100?C), Al2O3/Bi2O3 and SiO2/Bi2O3 (sintered at 1100?C). The composition of these systems consisted of 80% of oxide and 20% Bi2O3. The effects of sintering, composition and morphology were investigated by X-ray diffraction, scanning electron microscopy and EDS analysis. It has been found that Bi2O3, besides a liquid phase, forms intermediary unstable compounds with MgO and Al2O3. MAS ceramics were sintered with 10% Bi2O3 at 1000?C, 1100?C and 1200?C. .

The Influence of Bi2O3 and Sb2O3 on the Electrical Properties of ZnO-Based Varistors

This work presents a study of the influence of both Bi content and Sb/Bi ratio on the electrical characteristics of a commercial-type ZnO varistor. In contrast to previous studies two nonlinear coefficients, the breakdown fields and energy absorption abilities were measured after sintering at 970°C or 930°C. The Bi-content was varied from 0.9 to 1.8 at% while the Sb/Bi ratio was varied from 0.8 to 1.5, leading to values of up to 104 for the nonlinear coefficient α1, 1100 V mm−1 for the breakdown field and 1137 J cm−3 for the energy absorption ability. The highest α value was measured for the highest Bi-content and the lowest Sb/Bi ratio and vice versa. The breakdown field E V increased with lower sintering temperature, increased Sb/Bi ratio (at a given Bi-content) and increased Bi-content (at a given Sb/Bi ratio). The energy absorption coefficient increased at the higher sinter temperature and with lower Sb and Bi concentrations. The observed effects were related to the amount of spinel phase (Zn7Sb2O12) formed during the sintering process and the amount of liquid phase present during early stages of the sintering process.