Fe2O3 Glass Research Articles

Structural, mechanical, and radiation shielding properties of B2O3–Na2O–PbO–Fe2O3 glass system

In the present study, four glass samples were fabricated using ordinary melting quenching, and annealing processes. The glass composition was based on (85-x)B2O3–10Na2O-xPbO-5Fe2O3 formula where x = 10, 20, 30 and 40 all in mol%. Additionally, Fourier transform infrared (FTIR) was utilized to investigate the structural behavior of the synthesized glasses; it shows main peaks in the regions around 693 cm−1, 703 cm−1, 913 cm−1, 1001–1060 cm−1, 1187–1211 cm−1, and 1446–1303 cm−1. Moreover, various physical, and mechanical properties were calculated based on the Makishima and Mackenzi model to study the stability of the mentioned glasses. Young modulus reduced from 95.498 to 64.877 GPa for B75Pb10 and B45Pb40, respectively. The Phy-X/PSD software was employed to analyze various radiation shielding properties, including the mass attenuation coefficient and linear attenuation coefficient (LAC). The introduction of PbO% increased density values from 3.287 g/cm³ to 5.408 g/cm³, consequently enhancing the LAC across all incident photon energies. Numerically, the LAC values at 0.015 MeV for all glass samples prepared in this study are remarkably elevated with increasing Pb mol%: 101.38 cm−1, 193.46 cm−1, 289.15 cm−1, and 289.21 cm−1 for B75Pb10, B65Pb20, B55Pb30, and B45Pb40, respectively, suggesting efficient attenuation properties for B45Pb40 than the rest of samples prepared in this work. Various parameters were derived from the LAC, including the mean free path, half-value layer, transmission factor, and radiation protection efficiency. Additionally, an investigation into the variation of the effective atomic number for the prepared samples with energy was conducted. Finally, the relationship between the Specific Dose Constant (Γ) and Photon Energy (MeV) for the prepared samples, along with an examination of the dose rate, was carried out.

Sm2O3 doping-adjusted radiation shielding properties and optical stability under sunlight irradiation of B2O3–Na2O–Sm2O3–Fe2O3 glass

In this work, we prepared sodium borate glass doped with different amounts of iron oxide (Fe2O3) and samarium oxide (Sm2O3). The effects of replacing Fe2O3 with Sm2O3 on the absorbance, optical band gap, Urbach energy, and radiation shielding parameters were studied. With further additions of Sm2O3, the optical band gap values increased from 2.50 to 2.67 eV, while Urbach energy values decreased from 0.49 to 0.42 eV. Further, we explored the effect of sunlight on the absorbance, optical band gaps, and Urbach energy at 90 min of irradiation time. With further exposure to sunlight, the values of the optical band gaps decreased and Urbach energy increased as the exposure time increased from 0 to 90 min. Moreover, the percent of change in absorbance, optical band gap, Urbach energy, refractive index, nonlinear refractive index and third order susceptibility for the glass samples containing the highest concentration of Sm2O3 is insignificant (<10%). The small percentage changes in absorbance, optical band gap, and Urbach energy show that the glasses are stable when exposed to sunlight. On the other hand, the inclusion of higher concentrations of Sm2O3 leads to improved radiation shielding capabilities, as seen by the increased values of the mass attenuation coefficient and half-value layer. Herein, the investigated glasses are both more transparent and more effective at shielding radiation; they're prime candidates for use in this field.

Synthesis and optimization of alkaline earth borate glasses doped with Fe2O3: Significance of BaO/MgO on the physical, structural features and radiation shielding performance

In this study, MgO–BaO–B2O3–Fe2O3 glasses were synthesized using the conventional melt and quench method, and the role of BaO and MgO in dictating their structural, physical, and optical properties was investigated. The fast neutrons, electrons, and heavy charged radiation transmission abilities of the glasses were delineated with the aim of evaluating their capacity to act as radiation insulators. The density of the glasses decreased from 3.40 g/cm3 to 2.89 g/cm3 as the MgO content increased. Also, the obtained optical bandgap increased from 1.90 eV to 2.20 eV with the increase of MgO in the MBBFe glasses. The stopping powers of electrons vary from 1.39 to 11.01 MeVcm2/g, 1.41–11.37 MeVcm2/g, 1.43–11.69 MeVcm2/g, 1.44–11.87 MeVcm2/g and 1.46–12.05 MeVcm2/g for glasses with MgO contents of 0 (MBBFe0), 5 (MBBFe1), 10 (MBBFe2), 12.5 (MBBFe3), and 15 (MBBFe4) mol%, respectively. Generally, the increase in the MgO content of the glasses led to increased mass stopping powers of the protons, alpha particles, and carbon ions. The replacement of BaO with MgO compromised the thermal neutron interaction probabilities of the present glassy specimens. The MBBFe-0 glass had the best thermal neutron interaction cross sections. The fast neutron removal cross-section of the glasses was within the range of 0.1037–0.1070 cm−1 with MBBFe-3 having the highest value and MBBFe-4 the least. The increase in the BaO suppresses photon buildup within the glass system. The MBBFe-glasses displayed good physical and optical properties, photon and neutron shielding abilities, which makes them attractive for diverse shielding and optical functions.

Fe2O3- and MnO2-Doped Waste Glasses for Artificial Gems Products

This work, the effect of Fe2O3 and MnO2-doped waste glasses in formula (100−x)waste glasses: x Fe2O3/MnO2 (x = 0.0, 0.2, 0.4, 0.6, 0.8, and 1.0 mol%) were prepared using melt quenching technique and all glass sampled were investigated on physical and optical properties. The results exhibited that the density and refractive index of glass samples increased with Fe2O3/MnO2 content increased. The color of Fe2O3 and MnO2-doped waste glasses displayed yellow and purple, respectively, because of absorbance for Fe2O3 near 440 nm and 1,000 nm which homogeneous distribution of Fe3+ (440 nm: 6A1g(S) → 4T2g(G)) and Fe2+ (1,000 nm: 5T2g(D) → 5Eg(D)) ions in the glass matrices while MnO2 around 486 nm as absorption band is assigned to a single allowed 6A1g(S) → 4T1g(G) transition which arises from the Mn3+ ions (3d4 configuration) in octahedral symmetry. Moreover, the CIE L*a*b* for all glass samples were also investigated. The results indicated that glass production from waste glasses is possible and option for recycling waste glasses to produce artificial gems.

Gamma shielding performance of B2O3/BaO-based glassy system: Synthesis and simulation study

In this paper, the synthesis and gamma-radiation shielding attributes of xMgO-(30-x)BaO-69.5B2O3-0.5Fe2O3 glasses are reported. The aim is to ascertain the optimum chemical structure of the glass system for gamma radiation shielding applications and dosimetry. The simple melt and quench method was adopted for the synthesis of the xMgO-(30-x)BaO-69.5B2O3-0.5Fe2O3 glasses, where for x = 0, 5, 10, 12, and 15 mol% represented MBBFe-0, MBBFe-1, MBBFe-2, MBBFe-3, and MBBFe-4, respectively. The mass attenuation coefficients μ/ρ of the glasses were evaluated using the XCOM and FLUKA simulations for the photon energy range of 15 keV–15 MeV. The differences between the values of μ/ρ evaluated with FLUKA and XCOM were within 0.96%. The mass attenuation coefficients of MBBFe-0, MBBFe-1, MBBFe-2, MBBFe-3, and MBBFe-4 ranged from 0.0288 to 28.6205 cm2/g, 0.0279–25.6462 cm2/g, 0.0268–22.2712 cm2/g, 0.0260–20.4073 cm2/g and 0.0251–18.4086 cm2/g, respectively. The corresponding values of the half-value layer at 15 MeV are 7.06 cm, 7.64 cm, 8.25 cm, 8.70 cm, and 9.53 cm for MBBFe-0, MBBFe-1, MBBFe-2, MBBFe-3, and MBBFe-4, respectively. The specific gamma constant values of MBBFe-X glasses are in the range 11.289–264.417 Rm2/Cihr, 10.871–236.716 Rm2/Cihr, 10.386–205.282 Rm2/Cihr, 9.931–187.921 Rm2/Cihr and 9.444–175.515 Rm2/Cihr for MBBFe-0, MBBFe-1, MBBFe-2, MBBFe-3, and MBBFe-4, respectively. The substitution of BaO with MgO therefore, depreciated the gamma shielding efficacy, photon energy absorption abilities, and interaction per unit mass of the MBBFe-X glasses. This study concludes that MBBFe-0 is the best gamma absorber among the studied glasses and has the potential to be a good gamma-radiation shield with an efficiency that supersedes many traditional and modern shielding materials such as concrete, metal alloys, polymers, rocks, commercial glass shields, and other shielding glasses.

Impact of Y2O3 on the structural, linear and nonlinear optical parameters of Na2O-Fe2O3-B2O3 glass

In this work, we investigated the effect of Y2O3 additives on the microstructure and some optical features of Fe2O3 and Na2O-containing borate glasses. FTIR spectra were studied to explore the microstructure and functional units such as BO3, BO4 and nonbridging oxygen (NBO) content. The areas related to BO3 and BO4 bands were calculated from the deconvolution results. Moreover, the BO4/(BO4 +BO3) ratio, called the N4 parameter, was employed to study the microstructure changes induced by Y2O3/Na2O substitution. Moreover, we found the N4 parameter decreased with rising Y2O3 from 0 to 5 mol.%. In contrast, the area and height of the NBO-related band increased with the rise in Y2O3 from 0 to 5 mol.%. The latter two results reflect decreasing the BO4 content but increasing NBO contents in our glasses with more Y2O3 additives. This reduction in BO4 can be attributed to the higher field strength of Y3+ than the field strength of Na1+. Furthermore, the metallization criterion (MC) showed a very slight decrease from 0.403 to 0.401 with additional additives of Y2O3. Based on the obtained values of MC, the current Y2O3 containing glass samples present high nonlinear features. Further, nonlinear optical parameters showed increasing trends with increasing Y2O3 content.

Synthesis, optical, structural, and radiation transmission properties of PbO/Bi2O3/B2O3/Fe2O3 glasses: An experimental and in silico study

In this paper, a new glass combination containing PbO, Bi2O3, B2O3, and Fe2O3 has been synthesized, characterized, and studied in details for advanced optical and radiation shielding applications. The PbO excess was in the step of 10% at the expense of (Bi2O3+B2O3). The physical and optical parameters were experimentally measured for each prepared glass sample.The structure characterization of the glass specimens was performed by using both FTIR and XRD. Moreover, EPR spectra were studied to give a full understanding about the valence state and interaction of paramagnetic ions. Additionally, Monte Carlo method was utilized to design the simulation setup for studying the radiation propagation through the prepared samples. The obtained results indicate thatthe optical band gap values were found to be high with excess of PbO content. The EPR spectra have shown a high intense resonance signal at g ≈ 4.2 and mild intense signal located at g ≈ 2.1. The magnitudes of linear attenuation coefficients for the glasses at different energies shows that maximum (minimum) value of 290.39 (0.158), 322.67 (0.168), 367.13 (0.184), 431.04 (0.207), 502.32 (0.231), and 574.34 (0.0257) cm−1 was obtained for PBBF-0 – PBBF-50. This investigation lays the foundation for using the prepared glass system as a new candidate in advanced optical and shielding applications.

Effects of Fe2O3 on crystallisation and properties of R2O–CaO–MgO–Al2O3–SiO2–Fe2O3 glass ceramics

ABSTRACT The R2O–CaO–MgO–Al2O3–SiO2–Fe2O3 glass ceramics was prepared using granite wastes and Fe2O3. The effect of Fe2O3 on crystallisation and properties of glass ceramics was studied. Results show that the crystalline phases were Fe2TiO5 and K(NaCa)Mg5Si8O22F2 when the content of Fe2O3 was low. The main crystalline phase was Fe1.5Ti0.5O3 when the content of Fe2O3 was high. With the increase of Fe2O3, the crystal size of K(NaCa)Mg5Si8O22F2 reduced and the atomic ratio of Si to Mg increased. The colour of sample varied from greyish green to black with different additions of Fe2O3. The flexural strength with a maxim (101.02 MPa) when the content of Fe2O3 was 4.7 mol-%. Given the low cost of granite wastes and Fe2O3, this new type of black glass ceramics is expected to meet the increasing demand from the market of building decoration due to its excellent properties.

Third-order nonlinear optical features of zirconia-added lead silicate glass ceramics embedded with Pb2Fe2O5 perovskite crystal phases and role of Fe ions

This study is aimed to identify the role of Fe2O3 in enhancing the efficiency of THG beam of Nd:YAG laser in lead zirconium silicate glass ceramics. The PbO–ZrO2–SiO2:Fe2O3 glass ceramics were synthesized by heat-treating the glasses for a prolonged time. XRD and SEM studies were performed to identify different crystalline phases in the samples. The SEM pictures have shown the presence of multiple crystallites of size in the range 0.1–0.6 µm, while characterization by XRD technique indicated the glass ceramic samples consist of perovskite Pb2FeIII2O5, FeII2SiO4, crystal phases. These studies have also demonstrated that there is an enhancement in the concentration of Fe3+ (Oh) crystalline phases with increasing quantity of Fe2O3 in the samples. Spectroscopic investigations (viz., IR and optical absorption) have further reinforced the above result and additionally indicated an increased degree of internal chaos in the material. The intensity of third harmonic generation (THG) beam of Nd:YAG laser (λ = 1064 nm) measured in the reflected regime after the pre-photopolarization of the samples indicated the largest intensity for the samples containing the highest concentration of Fe2O3. Thorough analysis of these results indicated that the tilted glass samples heat-treated with 0.5 mol% of Fe2O3 have significant chaotic internal structure and paved the way for obtaining intense THG signal with minimal phonon losses. Hence, such glass ceramics are predicted to be useful materials in the design of different optoelectronic devices.

Extent of disorder in iron-bearing albite and anorthite melts: Insights from multi-nuclear (29Si, 27Al, and 17O) solid-state NMR study of iron-bearing NaAlSi3O8 and CaAl2Si2O8 glasses

Knowledge of the detailed structure of iron-bearing aluminosilicate glasses is essential to unraveling the effects of iron on the macroscopic properties of natural silicate glasses and melts. However, the local structures around the framework cations (such as Al and Si) and the extent of network polymerization in iron-bearing aluminosilicate glasses are not well understood. This is mainly because the high-resolution solid-state NMR - one of the effective probes of the structures of aluminosilicate glasses - has limited utility in delving into the local configurations of oxide glasses with paramagnetic elements (i.e., iron). Here, we use multi-nuclear (29Si, 27Al, and 17O) high-resolution solid-state NMR to investigate the effect of iron content on the local structure around framework cations and oxygen species in Na(Al1-XFeX)Si3O8 glasses with varying X [=Fe/(Al + Fe)] (Fe3+/ΣFe = ~0.8), NaAlSi3O8 glasses with varying Fe2O3 (NaAlSi3O8 + Fe2O3, Fe3+/ΣFe = ~0.5), and CaAl2Si2O8 glasses with varying Fe2O3 (CaAl2Si2O8 + Fe2O3, Fe3+/ΣFe = ~0.3).The NMR results for Na(Al1-XFeX)Si3O8 glasses reveal preferential interaction between Fe3+ and Si-rich framework and thus an extensive mixing between [4]Si and [4]Fe3+. The presence of a small amount of [5]Al in Na(Al0.5Fe0.5)Si3O8 glass suggests that the extent of disorder around Al increases by Al-Fe3+ substitution. The NMR results for NaAlSi3O8 + Fe2O3 glasses suggest that Fe2+ interacts more strongly with Al-rich framework and reveal the presence of a non-negligible fraction of Na-NBO, confirming Fe2+-induced structural disorder. The absence of [5]Al in NaAlSi3O8 + Fe2O3 glasses indicates that Fe3+ is more likely to form a highly-coordinated framework (i.e., [5]Fe3+) when excess Fe3+ is added to charge-balanced glasses. The NMR spectra for CaAlSi2O8 + Fe2O3 glasses showed an iron-induced increase in the [5]Al fraction and confirmed that the overall degree of disorder increases with increasing Fe2O3 content. The noble NMR results for iron-bearing aluminosilicate glasses revealed the nature of diverse aspect of iron-induced structural disorder, mainly characterized by the intermixing between Si and Fe3+, preferential interaction between Al and Fe2+, and formation of highly coordinated [5]Fe3+. The detailed iron-induced structural evolution is largely dependent on the composition of melts as well as the valence state of iron. The observed increase in the extent of structural disorder in charge-balanced Na- and Ca-aluminosilicate glasses with increasing Fe2+ and Fe3+ can account for the iron-induced decrease in viscosity of the corresponding iron-bearing aluminosilicate melts.

Simulated studies on optimization and characterization of feed and product of melter for safe disposal of high-level radioactive liquid waste

Abstract The elemental composition of actual High-level Liquid Waste (HLW) received from reprocessing plant was estimated from analysis of several samples by using Inductively Coupled Plasma-Atomic Emission Spectrometry (ICP-AES). Based on the composition, the simulated waste (20–30 wt % based on oxide content) was prepared and vitrified in SiO2·Na2O·B2O3·TiO2·Fe2O3 glass system. Simulated Vitrified Waste Products (SVWPs) were characterized for their structural changes and relative thermal properties by using Infra-red (IR) spectrometry, X-ray Diffraction (XRD) and Differential Scanning Calorimetry (DSC) techniques. The measure of BO3, BO4, and Si−O−Si functional groups were found to be decisive in thermal and chemical durability of the products. Leach rate (LRNa) was found to be 10−5−10−6 g/cm2 day for ≤26% waste oxide (WO) loaded SVWPs. The relative increase in surface area by imparting 1 J of energy to the SVWPs was found to be

Physical Properties of Lead Arsenate Glass System

My Present work is lead arsenate composite material ions, study the properties of the pbo As2O3 glass system doped with Transition metal ions, scanning electron micros copy, EDS, X-RD and Optical absorption peaks readings wave length rangeis 300-1200 nm for identification of various electronic transitions metal ions. Lead Arsenate pure glasses doped with various composites of iron ionswerepreserved. study the samples characterized by XRD studies and SEM studies reveal the existence of (Fe2Pb)As2O6glassypoints are also detected. The optical absorption bands ofthis glass have presented 3 absorption peaks on 670,560nm. the observed gradually growth trendy the strength of the peacks due to Fe+2transition ions at the expenditure of the peaks due to Fe+3transition ions up to 0.6 mol% .the amorphous Fe2O3 glasses in the range of frequency 102 Hz to 105 Hz and temperature is 77 k to 450 k.

Synthesis, physical, structural and shielding properties of newly developed B2O3–ZnO–PbO–Fe2O3 glasses using Geant4 code and WinXCOM program

New zinc lead borate glasses with (50B2O3–10ZnO–(40 − y) PbO)–yFe2O3: 0 ≤ y ≤ 10 wt%) composition were synthesized by the conventional melt-quench technique. The amorphous nature of the glasses was tested by using X-ray diffraction spectroscopy. FTIR spectra for the glasses were recorded in the range of 4000–400 cm−1. Physical properties of the proposed glasses were evaluated. The mass attenuation coefficients (μ/ρ) for the glasses were calculated by the Geant4 simulation toolkit code and XCOM software within the photon energy range 365–2510 keV. Different γ-ray shielding parameters such as half-value layer, tenth value layer, and transmission fraction for the proposed glasses were evaluated using the obtained values of the (μ/ρ). Results reveal that for 1 cm glass thickness, the (50B2O3–10ZnO–30PbO)–10Fe2O3 sample has the highest transmission, due to the lower amount of Pb, and thus poorer shielding capability among the other glass samples. In addition, the probabilities of γ-ray interaction with the studied glasses were investigated.

Phase separated and porous glasses in the Na2O–B2O3–SiO2–Fe2O3 glass forming system

Phase separated and porous glasses in the Na2O–B2O3–SiO2–Fe2O3 glass forming system

The effect of Fe contents on the local structure and crystallization behavior of SiO2–CaO–P2O5–Fe2O3 glasses

The glass and glass ceramics containing SiO2–CaO–Fe2O3–P2O5 were prepared by sol–gel method. The influence of the Fe contents on the crystallization and local structure of the glass and glass ceramics was systematically investigated. The crystal structure of the glass ceramics was identified by XRD characterization. Hematite phase can be precipitated from the glass matrix in all glass ceramics with various Fe contents, and the crystallographic parameters of hematite were determined by XRD Rietveld refinement. The crystallization kinetics of the glasses was investigated in detail. Relative low activation energies were obtained at low Fe contents. The local structure evolution of the glass and glass ceramics has been studied in-depth by means of FTIR and Mossbauer spectroscopy. Fe element is present both as network former and network modifier which significantly influenced the crystallization activation energies of the glasses. The results of this work may be of great significance for the material design and practical applications of bioactive magnetic glass ceramics for hyperthermia.

Sol-Gel Synthesis and Spectral Characterizations of (35-x)B2O3-65Bi2O3-x Fe2O3 Glass System

Sol-Gel Synthesis and Spectral Characterizations of (35-x)B2O3-65Bi2O3-x Fe2O3 Glass System

Electrochemical Properties and In-situ XAFS Observation of Li2O-V2O5-P2O5-Fe2O3 Quaternary-glass and Crystallized-glass Cathodes

Electrochemical properties of Li2O-V2O5-P2O5-Fe2O3 quaternary-glass and crystallized-glass cathodes were compared in terms of the local structural changes of vanadium and iron ions with increasing discharge capacity by in-situ X-ray absorption fine structure (XAFS) measurements. 10.3Li2O-69.2V2O5-10.2P2O5-10.3Fe2O3 glass was prepared by the melt-quenching method. The crystallized glass was produced by heat treatment of the glass at 375°C in air. The crystal phase of the crystallized glass was found to be a single phase of β-vanadium bronze. The glass exhibited a discharge capacity of around 300 mAh g−1 and a capacity retention of 66% after 100cycles. On the other hand, the crystallized glass exhibited a capacity of around 340 mAh g−1 and a capacity retention of 68% after 100cycles. In the cases of glass and crystallized glass, in-situ X-ray absorption near-edge spectroscopy (XANES) spectra revealed that a redox reaction of vanadium and iron ions occurs as a compensation reaction for lithium-ion insertion. In addition, the absorption-energy shift of the vanadium and iron K-edges in the case of glass was larger than that in the case of crystallized glass despite the same discharge capacity. The analysis of pre-edge peak intensities and extended X-ray absorption fine structure (EXAFS) analysis revealed that the vanadium and iron coordination symmetry of the glass can transform more easily than that of the crystallized glass under lithium-ion insertion. These results imply that the origin of good cycleability differs in the cases of glass and crystal-phase cathodes.

The influence of the heat treatment temperature in the magnetic characteristics of a SiO2–Li2O–Fe2O3 glass prepared by sol-gel

The glass with the molar composition 88SiO2–2Li2O–10Fe2O3 (mole %) was prepared by the sol-gel route and after heat-treated at temperatures between 250 and 1000°C under oxidizing conditions. Crystalline phases (LiFe5O8, SiO2, Fe2O3 and LiFe(Si2O6)) were observed by X-ray powder diffraction in the glasses treated at temperatures above 800°C. Scanning electron micrographs reveal the presence of particles in the samples heat-treated up to 800°C, which are essentially amorphous or with an incipient crystallization. The increase of the heat-treatment temperature promotes the coarsening of particles.The magnetic characteristics of the prepared glasses and glass ceramics were performed using a vibrating sample magnetometer in function of the magnetic field amplitude (−10T≤B≤10T) and in function of temperature (5K–300K). The samples heat-treated at 900 and 1000°C present a ferrimagnetic behavior accompanied by the appearance of peaks corresponding to the lithium ferrite phase (LiFe5O8). A curious aspect is the saturation magnetization of the sample heat-treated at 800°C is the highest of all samples, indicating the highest amount of LiFe5O8 crystals. The Mossbauer results are in accordance with the magnetization and magnetic susceptibility measurements.

Magnetic properties of ZnO–TeO2–Fe2O3 glasses

The electron spin resonance (ESR) and magnetization measurements were carried out on (20−x)ZnO–xFe2O3–80TeO2 (x=5–20mol%) glasses. The ESR signal consists of a broad resonance at g≈2.0 ascribed to antiferromagnetic interactions between the Fe2+ and Fe3+ ions. The linewidth (ΔHpp) and the intensity (J) of this signal increases with increase in Fe2O3 content. The magnetization measurements indicate the existence of short range antiferromagnetic (AFM) interactions between Fe ions which increases with increase in Fe2O3 content in these glasses.

Electronic conductivity in the SiO2–PbO–Fe2O3 glass containing magnetic nanostructures

The linear impedance spectra of iron–silicate–lead glass samples were measured in the frequency range from 1 MHz to 1 MHz and in the temperature range from 153 K to 423 K. The structure was investigated by means of XRD and atomic force microscopy. Local electrical and magnetic properties of the samples were tested with the aid of electrostatic force microscopy (EFM) and magnetic force microscopy (MFM). The obtained results show that the impedance spectra of all samples exhibit one large relaxation process and some additional small relaxation is present in glass containing 20 mol% and 25 mol% Fe2O3. The AFM micrographs show that in a subset of samples some nanostructures exist. Their size, shape, and quantity depend on the amount of Fe2O3 in the composition of the glass. The samples containing an amount of 15 mol% of Fe2O3 include the biggest nanostructures which are ball-shaped. EFM and MFM micrographs show that nanostructures exhibit different electrical and magnetic behaviors than the rest of the glass matrix. On the basis of Jonscher universal dielectric response the temperature dependence of conductivity exponent s was determined and compared to theoretical models proposed by Elliott. It was found that while in the glass containing less than 15 mol% iron oxide, there is only one process responsible for conduction mechanism, the overlap polaron tunneling. In the other samples, a different conduction mechanism may coexist: quantum mechanical tunneling between semiconducting granules.