Effect Of Ho3 Research Articles

Effect of Ho3+ Doping on Structural and Magnetic Properties of Multiferroic YbMnO3

Using the traditional solid-state reaction approach, multiferroic ceramics with the compositional formula Yb1−xHoxMnO3, where x = 0 to 0.4 with 0.1 variation were synthesized. The structural and magnetic properties of the prepared poly-crystalline samples Yb1−xHoxMnO3 were investigated to show the effect of higher magnetic moment Ho3+ ion over the Yb ion. X-ray diffraction was used to analyze the compound’s crystal structure and confirm that they have a hexagonal single-phase structure with a P6 3 cm space group. The presence of functional groups and their shifting to lower frequency regions were revealed by Fourier-transform infrared spectroscopy. UV–vis absorbance spectra were used to calculate the energy gap values, and the resultant data shows a decrease in band gap values with an increase in Ho3+ doping. Crystal deformation with the doping of Ho3+ was observed using Raman spectra. Room-temperature magnetic studies were used to reveal the paramagnetic nature of the samples and the increase in magnetic parameters due to the doping of the higher magnetic moment Ho3+ ion.

Ho3+ -doped BaGd2 ZnO5 green-emitting phosphor for solid-state lighting: synthesis, characterization, and photoluminescence properties.

In this work, we present the synthesis of a green-emitting series of BaGd2 ZnO5 :xHo3+ (0.5-3mol%) phosphors using a high-temperature solid-state reaction method. Phase purity and crystal structure information were evaluated through X-ray powder diffraction patterns. Optical properties were examined through diffuse reflectance spectra, revealing that the prepared phosphor exhibited a band gap of 4.65 eV. The effect of Ho3+ doping on the morphology and ion distribution on the surface was assessed using scanning electron microscopy and time-of-flight secondary ion mass spectrometry techniques, respectively. The excitation spectra of the synthesized phosphor exhibited a charge transfer band and strong absorption transitions. The emission spectra displayed typical holmium emission characteristics, featuring a strong green emission band associated with f-f transitions from 5 F4 + 2 S2 → 5 I8 . Decay dynamics of the synthesized phosphor exhibited a single-exponential decay pattern, with lifetimes ranging from 0.103 to 0.053 ms. The intrinsic radiative lifetime, calculated through Auzel's fitting was determined to be 0.14 ms. Using the emission spectra, colorimetric behaviour was analyzed, revealing that the Commission Internationale de l'éclairage (CIE) coordinates exclusively lay within the green region at (0.285, 0.705), with an impressive colour purity of 99.6%. Given these marked properties, the synthesized phosphor exhibits great potential for a wide range of green-emitting applications, including displays, white light-emitting diodes, and security signage.

Effects of Ho3+ concentration on the fabrication and properties of Ho: Y2O3-MgO nanocomposite for Mid-infrared laser applications

Infrared transparent Ho: Y2O3-MgO nanocomposite ceramics with a volume ratio of 50:50 (RE2O3: MgO) were prepared by combining sol-gel powder synthesis and hot-pressing sintering techniques. In order to obtain Ho: Y2O3-MgO nanocomposite ceramics with fine grain size, dense microstructure and homogeneous phase domains, the effect of sintering temperature and Ho3+ doping concentration were studied. Transmittance and SEM measurement revealed that the grain size of 3 at.% Ho: Y2O3-MgO ceramic sintered at 1250 °C is 141 nm, and the transmission is up to 85.2% at 5 μm. The detailed spectroscopic investigation of x at.% Ho: Y2O3-MgO (x = 1, 3, 5, 7, 9, 15) ceramics was performed. The nanocomposites exhibited photoluminescence properties similar to that of Ho: Y2O3 crystals and ceramics. In addition, the thermal conductivity of 3 at.% Ho: Y2O3-MgO ceramic is 13.04 W/m·K, which is superior to that of Ho:Y2O3 ceramics. The high transmission, excellent thermal conductivity, and outstanding optical characteristics indicated that Ho: Y2O3-MgO ceramics is a promising material for efficient infrared solid-state laser.

Effects of Ho3+ concentration on the microstructure, photoluminescence and temperature sensing properties of ZrO2: Er3+/Yb3+/Ho3+ nanocrystals

Optical thermometry in the second near-infrared (NIR-II) window with high tissue penetration depth has great value in biological and medical sciences. Herein, we reported the synthesis of ZrO2: Er3+/Yb3+/Ho3+ nanocrystals for temperature sensing in both NIR-II and visible regions. The effects of Ho3+ co-doping concentration on the structure, morphology, photoluminescence properties and temperature sensing behaviors of ZrO2: Er3+/Yb3+/Ho3+ were investigated in detail. X-ray diffraction and scanning electron microscopy measurements validated that the introduction of Ho3+ ions could induce the phase transition of ZrO2 from monoclinic to tetragonal phase and increase the crystalline grain size of the samples. Upon 980 nm excitation, the enhancements in both visible and near-infrared emissions were achieved via the addition of 0.05 mol%Ho3+. Meanwhile, the optical thermometry performances of the samples were found to depend on the Ho3+ concentration, when the luminescence intensity ratio of I525/I541 (LIR-1) and also that of I1463/I1224 (LIR-2) were selected for temperature sensing. For LIR-2, the maximal relative sensing sensitivity (Sr) of 2.08%K−1 was obtained for the 1%Ho3+ co-doped sample at 303 K, which was higher than many other phosphors operating in the NIR-II window. The present work may provide an effective route to develop efficient visible and NIR luminescence materials for high-performance temperature sensing.

Synthesis and properties of YVO4:Ho and YVO4:Ho,Bi luminescent nanomaterials by combustion method

YVO4:Ho and YVO4:Ho,Bi nanophosphors were synthesized via combustion synthesis using urea as fuel and metal nitrates as precursor. Structures, morphologies and optical properties of YVO4:Ho and YVO4:Ho,Bi nanophosphors annealed at 900 °C were studied by X-ray diffraction (XRD), scanning electron microscopy (SEM), photoluminescent (PL) and photoluminescent excitation (PLE) spectra. The clearly YVO4 tetragonal phase was obtained. The average diameters for the phosphor particles are 20-30 nm. The nanophosphors could be excited by 320 nm which correspond to the VO4 absorption and then PL spectra of YVO4:Ho and YVO4:Ho,Bi nanophosphors are described by the 5F8, 5S2 – 5I8, 5F5 – 5I8 và 5F4, 5S2 → 5I7 transitions of Ho3+ ions at 543, 655 and 755 nm. The effects of Ho3+ and Bi3+ concentrations on structure and optical properties have been investigated

Effect of Ho3+ concentration on the luminescent and thermal stability of tellurite glasses

It is well known that optical properties of soft glasses can be improved by modifying the glass matrix or the lanthanides ions concentration. However, in the case of soft glasses doped with Ho3+ ions the information is limited to a few manuscripts that deals mainly with optical properties, neglecting the effect that could have in thermal properties. The present work shows the fabrication and characterization of Ho3+ doped tellurite glass samples ((78-x)TeO2 - 10Nb2O5 - 10TiO2 - 2Al2O3 - xHo2O3, where x = 0, 0.5, 1, 2 and 3 mol.%), prepared by melting and quenching technique. Differential scanning calorimetry were measured. In order to observe the characteristic energy levels of Ho3+ ions, UV-Visible absorption spectra and luminescence spectra under 488 nm excitation were recorded. The results showed that the incorporation of Ho3+ has a positive influence on thermal and luminescent properties as the Ho3+ concentration increases up 0 to 2 mol.%.

Effect of Ho3+ ions on microwave losses and high-temperature electrical behavior of Li-based magnetic oxides

We investigate here the effect of holmium on Li–Co nano-ferrites to elaborate the surface morphology, dynamic magnetic and electrical transport properties. The transmission electron microscopy (TEM) technique was employed to examine the microstructure and grain size distribution. TEM analysis confirmed the nanocrystalline nature (~50 nm) of the prepared materials. X-ray photoelectron spectroscopy (XPS) experiment results verify the presence of all metal ions with the required valences. Ferromagnetic resonance (FMR) analysis revealed the need for a dense microstructure to cut down the microwave losses. FMR line width was observed to reduce from 2757 -to 1676 Oe except for x = 0.12 by the substitution of Ho ions which correspond to low microwave losses. The dc resistivity results show that high resistivity values are associated with smaller grains of the samples and vice versa. Resistivity values are found to increase from 3.66 × 108 -to 5.31 × 108 Ω-cm by increasing the Ho addition. Seebeck experiment revealed n-type conduction. Together with showing the nature of charge carriers, a decrease in the Seebeck coefficient with increasing Ho ensured the replacement of Fe ions by Ho ions on B-sites.

Effect of Ho3+ Ion Doping on Thermal, Structural, and Morphological Properties of Co–Ni Ferrite Synthesized by Sol-Gel Method

Rare earth Ho3+-substituted Co–Ni ferrites having a chemical formula Co0.6Ni0.4Fe2−xHoxO4 (0.0, 0.025, 0.05, 0.075, and 0.1) were prepared via sol-gel route. The phase formation of these samples was confirmed by the thermogravimetric analysis with differential thermal analysis and X-ray powder diffraction techniques. Rietveld refinement confirms the cubic spinel structure of the prepared samples having space group Fd3− m with presence of secondary phase of α-Fe2O3. The lattice parameter is increased from 8.412 to 8.582 A with Ho3+ ion concentration in cobalt–nickel ferrite from x = 0 to x = 0.1. The distribution of cations has been studied with the help of X-ray diffraction data and it is found that Ho3+ ions preferred to occupy the octahedral [B] site. The other structural parameters like X-ray density, bulk density, hopping length, and allied parameter are increased with the composition of Ho3+ ions in the Co–Ni ferrite. The morphology of the samples was observed by transmission electron microscopy and scanning electron microscopy showed the nanostructured formation.

Spectroscopic properties of Er3+/Yb3+/Ho3+:CaLaGa3O7 and Er3+/Yb3+/Eu3+:CaLaGa3O7 crystals used in mid-infrared lasers

Er3+/Yb3+/Ho3+:CaLaGa3O7 (abbreviated as Er/Yb/Ho:CLGO) and Er3+/Yb3+/Eu3+:CaLaGa3O7 (Er/Yb/Eu: CLGO) crystals were grown by Czochralski technology and detailed spectroscopic analyses were carried out. The effects of Ho3+ and Eu3+ on the spectroscopic properties and mutual energy transfer mechanisms were investigated. It is found that the introductions of Ho3+ and Eu3+ are helpful in achieving enhanced mid-infrared (MIR) emission, as well as reduced near-infrared emission. Furthermore, the introduction of Ho3+ and Eu3+ depopulated the lower laser level through energy transfer and thus reduced the fluorescence lifetime of Er3+:4I13/2 in Er/Yb/Ho:CLGO and Er/Yb/Eu:CLGO crystals without significantly affecting the fluorescence lifetime of the upper laser level Er3+:4I11/2, which reduces the self-saturation problem to a degree. As a result, Eu3+ is a more appropriate deactivated ion than Ho3+ for Er3+ in this crystal. So Er/Yb/Eu:CLGO crystal could be a potential MIR gain medium for an enhanced 2.7 μm laser.

Fabrication and spectral properties of Ho-doped calcium fluoride transparent ceramics

The high quality of different holmium doping concentration calcium fluoride (Ho: CaF2) transparent ceramics were fabricated by hot-pressing method, which average transmittance reached to 83% at 1200 nm. The effect of Ho3+ concentrations on structural and spectroscopic properties of Ho: CaF2 transparent ceramics were investigated. With the increase of the Ho3+ ions doping concentration, the grain size of nanopowders decreased and the grain size of ceramics decreased first and then increased. The absorption coefficient of the Ho: CaF2 increased with the increase of doping concentrations. Emission and absorption cross sections of the 5I7 energy level of Ho3+ in CaF2 transparent ceramics were investigated. A strong intensity of emission peak at 2030 nm was observed, the fluorescence lifetime at 2030 nm was also investigated which indicating that Ho:CaF2 transparent ceramic is a potential candidate for 2.0 μm laser emission materials.

Tunable structure and intensive upconversion photoluminescence for Ho3+-Yb3+ codoped bismuth titanate composite synthesized by sol-gel-combustion (SGC) method

Ho3+ and Yb3+ codoped bismuth titanate (BTO) composite powders with infrared to visible upconversion luminescence (UCL) function were prepared by SGC method. The effects of Ho3+ and Yb3+ doping content on the structure and property were investigated for BTO: xHo, 0.2 Yb (x = 0, 0.02, 0.04, 0.06, 0.08, 0.1) and BTO: 0.02Ho, yYb (y = 0.1, 0.2, 0.3, 0.5, 0.7, 0.9) samples. All the samples include three bismuth titanate phases (Bi4Ti3O12, Bi2Ti2O7, and Bi20TiO32), and the phase proportion can be tuned by changing Ho3+ and Yb3+ doping content. These powders are well crystalized with honeycomb-like microscopic structure, and with good absorption for 233 nm, 310 nm and 975 nm wavelength. The band gap can be tuned from 3.53 eV to 4.03 eV when increasing Yb3+ content from y = 0 to y = 0.9. A strong 530–580 nm green emission band and a relative weak 630–690 nm red one corresponding to Ho3+: 5S2 → 5I8 and 5F5 → 5I8 transitions appear in the UCL spectra for all the BTO: Ho, Yb samples when pumped at 980 nm. The emission intensities can well be tuned with various Ho3+ and Yb3+ content. The optimal UCL was obtained in BTO: 0.02Ho, 0.5 Yb for all the prepared samples. The energy transfer mechanism is analyzed by building a two-photon energy transfer model, which is proved by the relationship between emission intensities and pumping power measurement. The concentration quenching of Ho3+ is caused by cross relaxation of CR1 and CR2 (Ho: 5F4, 5S2 + 5I8 → 5I4 + 5I7) and by CR3 (Ho: 5F4, 5S2 + Yb: 2F7/2 → Ho: 5I6 + Yb: 2F5/2) for Yb3+ quenching. The mean luminescence lifetime (τm) from Ho: 5S2 decreases monotonously with the increase of Ho3+ and Yb3+ content.

Intrinsic polarization and resistive leakage analyses in high performance piezo-/pyroelectric Ho-doped 0.64PMN-0.36PT binary ceramic

This paper presents in detail the ferroelectric properties of Ho-doped 0.64Pb(Mg1/3Nb2/3)O3-0.36PbTiO3 ceramic including determination of intrinsic polarization and investigation of resistive leakage. The effect of Ho3+ doping on the structure, dielectric, piezoelectric and ferroelectric properties of PMN-PT ceramics was studied. Perovskite phase of pure and Ho-doped 0.64Pb(Mg1/3Nb2/3)O3-0.36PbTiO3 ceramics were synthesized using solid state reaction method. Powder XRD confirmed the incorporation of Ho3+ ions in PMN-PT lattice. EDX spectra confirmed the existence of Ho and its homogeneity in doped-sample. The average grain size, transition temperature and dielectric loss factor (tan δ) decreased while the density and the dielectric constant of the PMN-PT ceramic increased by Ho doping. Furthermore, an increase in the ferroelectric properties and the piezoelectric coefficient (d33∗, from 547 to 610 pm/V) were observed for doped sample. The ‘Remanent Hysteresis Task’ revealed that a major portion (80.42%) of the remanent polarization (Pr) is switchable in the sample which makes Ho-doped PMN-PT a potential material for memory switching devices. Time-dependent compensated (TDC) hysteresis task and fatigue test were carried out which revealed resistive leakage and fatigue free nature of Ho-doped PMN-PT ceramic. These results demonstrate that Ho-doped PMN-PT ceramic possesses excellent properties to achieve a variety of applications.

Effect of Ho3+ and Tm3+ concentration on UV-VIS-NIR and upconversion luminescence in Ho:Tm:LiNbO3 crystals

Abstract Ho:Tm:LiNbO3 crystals with x mol% Ho3+ ions and y mol% Tm3+ ions (x = 0.1, 0.2, 0.25 and 0.3, y = 1, 2, 2.5 and 3) were grown by the Czochralski method. The influence of Ho3+ ions and Tm3+ ions concentration on the UV-VIS-NIR absorption spectra was discussed. The upconversion luminescence of Ho3+ and Tm3+ ions was observed under 800 nm excitation, and the energy transfer mechanisms of upconversion process were analyzed in details. The energy transfer mechanisms reflect that cross relaxation (CR), excited state absorption (ESA) and energy transfer (ET) from 3F4 (Tm3+) to 5I7 (Ho3+) are responsible for the upconversion emissions. The blue emission at around 473 nm, green emission at around 544 nm and red emission at around 648 nm were both enhanced obviously by doping 0.3mol% Ho3+ ions and 3mol% Tm3+ ions. The results show that Ho:Tm:LiNbO3 crystal is an excellent potential laser medium.

Effect of Ho3+ concentration on the structure, morphology and optical properties of Ba0.5Mg0.5Al2O4 nanophosphor

Barium magnesium aluminate nanopowders doped with holmium (Ba0.5Mg0.5Al2O4:x% Ho3+) were successfully prepared by the sol-gel method. The Ho3+ concentration was varied up to 2 mol%. X-ray powder diffraction results showed that the Ba0.5Mg0.5Al2O4 nanopowders crystallized in the hexagonal phase of BaAl2O4. Scanning electron microscopy images suggested that the doping influences the particle morphology. Photoluminescence results showed visible emissions observed at around 422 and 733 nm which originated from intrinsic defects within the host material as well as emissions at around 491, 550, 662 and 758 nm which were attributed to the 5F3 → 5I8, 5F4/5S2 → 5I8, 5F5 → 5I8 and 5S2 → 5I7 transitions of Ho3+ respectively. Infrared emissions around 1157 and 1200 nm were attributed to the 5S2,5F4 → 5I6 and 5I6 → 5I8 transitions of Ho3+. Increasing the Ho3+ concentration up to x = 0.8% led to luminescence enhancement, while further increase led to luminescence quenching. Lifetime measurements revealed that the x = 0.8% sample with maximum emission intensity at 550 nm has a strong lifetime component of 7.79 μs and a small component of long lifetime 79 μs, while the x = 2% (maximum doped) sample exhibited some concentration quenching and the contribution of the medium (7.79 μs) component was lower. The Commission Internationale de l’Eclairage (CIE) co-ordinates showed that the emission colour could be tuned towards bluish-purple by mixing of the MgAl2O4 and BaAl2O4 components. The Ho3+ concentration influenced the proportion of green emission colour.

Optical properties induced and ferroelectric properties enhanced of the PMN-32PT:Ho relaxor ferroelectric crystals

Relaxor ferroelectric crystals PMN-32PT:Ho were prepared by using the flux method. Phase structure and surface morphology of the crystals were performed by using the X-ray diffraction analysis (XRD) and scanning electron microscope (SEM), respectively. A broad dielectric peak in temperature dependent of dielectric spectrum was observed during the phase transition of the PMN-32PT:Ho crystals. The modified Curie-Weiss and Lorentz-type laws were used to describe the dielectric relaxor behavior of the crystals. Optical performances were characterized by using the fluorescence spectrophotometer, Fourier transform infrared spectroscopy (FTIR) and ultraviolet spectrophotometer. Effects of Ho3+ modification on structure, dielectric relaxation, ferroelectric and optical properties of the PMN-32PT crystals were investigated. Ferroelectric properties were improved and the larger coercive field EC was found to be 4.31 kV/cm at room temperature by the Ho modification. Optical performances of the PMN-PT crystals could be induced by the introduction of the Ho ions. The green light of 550 nm and red light of 630 nm were emitted under the excitation at 465 nm. The mechanism of the up-conversion luminescence for as-grown crystals was also discussed.

Effect of holmium substitution on the structural, magnetic and transport properties of CoFe2-xHoxO4 ferrites

The effect of Ho3+ substitution on the structural, magnetic and transport properties of a series of CoFe2-xHoxO4 (referred to CFHO) ferrites, (where, x = 0.00–0.20 in steps of 0.05) were studied. All the samples investigated were synthesized by the standard solid state reaction technique. X-ray diffraction (XRD) patterns confirmed the formation of single phase cubic spinel structure in all the compositions. The increases in the values of lattice parameter with the increase in Ho3+ concentrations suggested the expansion of unit cells. Bulk density was found to be decreased, and porosity increased for CFHO with composition x = 0.05 due to some structural distortion. Field emission scanning electron microscopy (FESEM) images showed that Ho3+ had a significant effect on the grain growth of the samples. The substitution of Ho3+ strongly influenced the magnetic characteristics which were confirmed from the magnetization measurements examined by vibrating sample magnetometer (VSM). Curie temperature (Tc) was found to be decreased linearly with the increase of Ho content ascribed to the weakening of A-B exchange interaction. The initial permeability was found to be independent of frequency up to a high frequency region for all the studied composites. All the samples showed very low loss factor at high frequency region and remained almost constant. AC electrical resistivity was found to be decreased with the composition up to 0.15 and then increased for x = 0.20. Frequency dependent dielectric constant measurements showed that Ho3+ substitution improved the dielectric constant values of the CFHO ferrites.

Effects of Ho3+ and transition metal ion doping on optical and magnetic properties of BiFeO3 nanopowders

BiFeO3 (BFO), Bi0.9Ho0.1FeO3 (BHFO), and transition metal (TM = Cr, Mn, Co, Ni, Cu, Zn) doped Bi0.9Ho0.1FeO3 (BHFO-TM) nanopowders were prepared by a double-solvent-based sol–gel route. The effects of Ho3+ and TM ion co-doping on the structural, morphological, optical, and magnetic properties of BFO nanopowders were analyzed by X-ray diffraction (XRD), transmission electron microscope (TEM), UV–Vis-NIR Spectrophotometer, and vibrating sample magnetometer. XRD patterns confirmed the distorted perovskite structure with R3c space group for all BHFO and BHFO-TM samples. TEM images identified that the particles of all BHFO and BHFO-TM samples were structured at the nanoscale (50 ~ 90 nm). BHFO-TM samples represented different visible light absorption and further decreased the band gap of BFO. The band gap of BHFO-Co nanoparticles (NPs) was the least (1.70 eV), which was a promising material for photocatalyst and photovoltaic devices. The magnetic tests indicated that BHFO-Cr in the BFO, BHFO, and BHFO-TM NPs samples had stronger ferromagnetic property with a small coercive magnetic field (H c = 82 Oe), which is suitability for device applications. The mechanisms of the effects of Ho3+ and transition metal ion doping on optical and magnetic properties of BFO nanopowders were discussed in detail.

Effects of Ho3+ concentration on the photoluminescence of the ZnO Up-conversion films

The ZnO up-conversion films were prepared by sol-gel and spin-coating methods. The results showed that ZnO remained the hexagonal wurtzite structure after rare earth ions were doped. The light transmittance of the films at near-infrared (800–1250nm) wavelengths decreased at first and then increased, and the lowest value appeared when the concentration of Ho3+ was 7mol%. There were two intense emission bands in the up-conversion emission spectrum, namely the 545nm green light and the 660nm red light. The up-conversion luminescence intensity of the films increased at first and then declined, and the maximum was at 7mol%.

Structural and Ferromagnetic Properties of Ho-Doped BiFeO<sub>3</sub> Films

In order to improve the structural and ferromagnetic property of BiFeO3, the effects of Ho3+ doping is systematically investigated. Pure BiFeO3 and Ho-doped BiFeO3 thin films are fabricated by sol-gel method, and the phase structure, morphology, crystalline structure, ferromagnetic are characterized by XRD, SEM, Raman spectra and VSM, respectively. The XRD patterns of the samples indicate that all the compounds crystallize in rhombohedral distorted perovskite structure with space group R3c and the Ho substitution can suppress the intrinsic formation of the miscellaneous phase. The SEM proves that along with the increasing of Ho concentration, the surface roughness of BiFeO3 is decreased due to the reduction of defects in the preparation. From the Raman spectroscopy, it is found that the peak intensity of 8 modes in Bi1-xHoxFeO3 are increased and the modes shift to higher wave number. Besides, the VSM results show that the ferromagnetic of the samples is enhanced with increasing of Ho concentration. When x=0.1, Ms is improved to be 4.8emu/g. The results can prove that the Ho3+ doping can reduce the volatilization of Bi3+, decrease the concentration of oxygen vacancies and improve the room-temperature ferromagnetic of BiFeO3.

Crystal structure refinement, ferroelectric and ferromagnetic properties of Ho3+ modified BiFeO3 multiferroic material

Multiferroic Bi1-xHoxFeO3 (x = 0, 0.05, 0.1) ceramics have been prepared by rapid liquid phase sintering method. The effect of Ho3+ doping on the crystal structure, dielectric, ferroelectric properties, TN and TM of BiFeO3 ceramics is studied. The result shows that all the peaks for Bi1-xHoxFeO3 samples can be indexed according to the crystal structure of pure BiFeO3 by XRD and the grain size from 1 to 5 μm is observed for BiFeO3 samples with Ho3+ doped. The dielectric behavior of Bi1-xHoxFeO3 ceramics varies with frequency and temperature, which might be understood in terms of an oxygen vacancy, the displacement of Fe3+ ions and lattice phase transition. There is a perfect dielectric hysteresis phenomenon in the ɛr-V curves of Bi1-xHoxFeO3 samples at bias voltage with 10 V. Under the action of the bias voltage, more and more dipoles are“frozen”in the bias voltage direction and quit polarization gradually, resulting in lower dielectric constant. The unsaturated P-E hysteresis loop of Bi1-xHoxFeO3 (x = 0.05, 0.1) samples is obtained with a large 2Pr of 3.08 μC/cm2. The Pr, Mr of Bi0.9Ho0.1FeO3 sample is nearly 23, 35 times as large as that of BiFeO3, respectively. It can be inferred that Ho3+ doping in BiFeO3 ceramics is proved to be an effective way to modulate the ferroelectric and the magnetic properties. It shows that the TN of BiFeO3 changes slightly from 644 K to 638 K and the TM of Bi1-xHoxFeO3 will reduce from 878 K to 860 K with increasing Ho3+ content. It can be attributed to the Fe3+–O2+–Fe3+ super-exchange strength and the relative stability of the magnetic structure.