ZrO3 Ceramics Research Articles

Physical Characteristics of (1 − x)(NKL)(NST)O3 − x(Ba0.90Ca0.1)ZrO3 Ceramics

(1 − x)(NKL)(NST)O3 − x(Ba0.90Ca0.1)ZrO3 ceramics with (Ba0.90Ca0.1)ZrO3 substitution were synthesized and their physical characteristics were systematically analyzed. All specimens showed typical perovskite structure and no second phase was found according to (Ba0.90Ca0.1)ZrO3 substitution. When Ba0.90Ca0.1)ZrO3 substitution x = 0.02, the highest piezoelectric characteristics of d33 = 260 pC/N, er = 1904, kp = 0.4102, Qm = 106 were found for piezoelectric devices such as actuators and ultrasonic sensors.

Effects of Li2CO3 addition on the microstructural and electrical properties of lead-free piezoelectric (Ba,Ca)(Ti,Zr)O3 ceramics sintered in air or a reducing atmosphere

The effects of Li2CO3 addition on microstructural and piezoelectric properties of lead-free (Ba,Ca)(Ti,Zr)O3 piezoceramics sintered in either air or a reducing atmosphere were investigated. A reducing atmosphere was maintained by controlling the oxygen partial pressure with a suitable mixture of Ar, H2, and CO2 gases. Li2CO3 addition promoted grain growth in the ceramic samples, which were highly polarized following poling treatment. An optimal amount of Li2CO3 was necessary for maintaining controlled grain growth and high density during sintering. The resulting ceramics exhibited high electrical resistivity and improved piezoelectric properties. The dielectric properties of the ceramics prepared with Li2CO3 exhibited a similar dependence on temperature, regardless of the sintering atmosphere or amount of Li2CO3 added. Even though the amount of added Li2CO3 ranged from 0.3 to 9 mol%, the residual Li content in the ceramics after sintering was approximately 0.1 mol%. The sintered bodies exhibited good electrical resistivity (>1012 Ω cm) and relatively high piezoelectric constants (d33) of ∼400 pC/N.

Dielectric and Piezoelectric Properties of 0.97(Na0.52K0.443Li0.037)(Nb0.96-xSb0.04Tax)O3–0.03(Bi0.5Na0.5)0.9(Sr)0.1ZrO3 Ceramics for Pizoelectric Actuator

In this study, 0.97(Na0.52K0.443Li0.037)(Nb0.96-xSb0.04Tax)O3–0.03(Bi0.5Na0.5)0.9(Sr)0.1ZrO3 ceramics were fabricated as a function of Ta substitution by conventional solid state method in order to develop the excellent composition ceramics for piezoelectric actuator, and their dielectric and piezoelectric properties were investigated. As the chemical composition results of 0.97(Na0.52K0.443Li0.037)(Nb0.96-xSb0.04Tax)O3–0.03(Bi0.5Na0.5)0.9(Sr)0.1ZrO3 system, we obtained the following results: When Ta was substituted for the ceramics, all the ceramics possessed a perovskite structure. When the substitution of Ta was 0, 0.01 and 0.02, Morphotropic phase boundary (MPB) region, which is coexist with rhombodedral phase and tetragonal phase was appeared. With further increasing the Ta substitution, the ceramics showed the strengthened tetragonal phase together with the coexistence of rhombodedral phase and tetragonal phase. The NKN-BNZ ceramics with x = 0.02 showed excellent piezoelectric properties. The density (ρ), piezoelectric constant (d33), planar piezoelectric coupling coefficient (kp), mechanical quality factor (Qm), and dielectric constant (er) were optimized as 4.456 (g/cm3), 269 (pC/N), 0.419, 51, 1644, respectively.

Electrocaloric effect and pyroelectric performance in (K,Na)NbO3‐based lead‐free ceramics

AbstractThe issue of how to achieve an electrocaloric effect (ECE) and pyroelectric effect in a material simultaneously remains to be a challenge for developing practical solid‐state cooling devices and RF‐detectors. Here, we structure a polymorphic phase transition (PPT) region by doping modification in KNN‐based ceramics, which are developed to achieve the ECE. The direct measured ECE and pyroelectric properties are investigated in lead‐free (1‐x)K0.5Na0.5NbO3‐xBi0.5Na0.5ZrO3 (KNN‐xBNZ) ceramics. The adiabatic temperature change (∆T) of 0.22 K at 100°C, 0.14 K at 70°C and 0.16 K at 30°C can be obtained under an electric field of 35 kV cm–1 for x = 0.03, 0.04 and 0.05, respectively. In addition, the temperature dependence of pyroelectric coefficient (p) is established for all compositions via the Byer‐Roundy method. A large p of 454.46 × 10–4 C m–2 K–1 is detected at Curie temperature (TC) in the ceramics with x = 0.03. Achieving electrocaloric effect and pyroelectric performance simultaneously may shed light and provide a feasible design scheme for developing practically useful electrocaloric and pyroelectric materials.

Enhanced piezoelectric response of (Ba,Ca)(Ti, Zr)O3 ceramics by super large grain size and construction of phase boundary

Ba0.85Ca0.15Zr0.1Ti0.9O3 (BCZT) ceramics with super large grain size (>50 μm) have been successfully fabricated by sol-gel method. The effects of pH value of precursor solution on microstructure, electric properties and fatigue behavior were systematically studied. BCZT ceramics with super large grain size (35–55 μm) were prepared by BCZT powders with large particle size (136–221 nm) by controlling the pH value. The grain size and densification of BCZT ceramics decrease with the increase of pH value of precursor solution. XRD results indicate that there is the coexistence of rhombohedral and tetragonal phase in BCZT ceramics synthesized by precursor solution with a pH of 3 and are the coexistence of orthorhombic and tetragonal phase in BCZT ceramics synthesized by precursor solution with a pH of 5 and 7. BCZT ceramics shows obvious diffuse ferroelectric-paraelectric phase transition characteristic and the diffuseness behavior enhances as the pH value increases. The remnant polarization and coercive electric field of BCZT ceramics reduce with the decreased grain size caused by the increase of pH value. The excellent piezoelectric properties (d33 = 585.6 pC/N and d33∗ = 898 pm/V) of BCZT ceramics have been obtained by super large grain size and the construction of phase boundary of tetragonal phase and orthorhombic phase. Furthermore, BCZT ceramics with large grain size still has high fatigue resistance to bipolar electric cycling.

Enhanced thermal stability of piezoelectricity in lead-free (Ba,Ca)(Ti,Zr)O3 systems through tailoring phase transition behavior

Good thermal stability in lead-free BaTiO3 ceramics is important for their applications above room temperature. In this study, thermal stable piezoelectricity in lead-free (Ba,Ca)(Ti,Zr)O3 ceramics was enhanced by tailoring their phase transition behaviors. Comparison between (1-x)Ba(Ti0.8Zr0.2)O3-x(Ba0.65Ca0.35)TiO3 and (1-y)Ba(Ti0.8Zr0.2)O3-y(Ba0.95Ca0.05)TiO3 revealed that latter system at y = 0.80 had much better thermal stable piezoelectric coefficient than the former at x = 0.45. Both systems crystalized in tetragonal to orthorhombic phase boundary at room temperature. The phase transition temperature and degree of diffusion were adjusted by Ca and Zr ions contents and demonstrated great influence on temperature dependent dielectric permittivity, hysteresis loops, and in-situ domain structures. The improved thermal stability of (1-y)Ba(Ti0.8Zr0.2)O3-y(Ba0.95Ca0.05)TiO3 prepared at y = 0.80 was linked to its higher paraelectric to ferroelectric phase transition temperature (Tm = 115.7 °C) and less degree of diffusion (degree of diffusion constant γ = 1.35). By comparison, (1-x)Ba(Ti0.8Zr0.2)O3-x(Ba0.65Ca0.35)TiO3 prepared at x = 0.45 revealed Tm = 81.3 °C and γ = 1.65. Overall, these findings look promising for future stimulation of phase transition behaviors and design of piezoelectric materials with good thermal stabilities.

Rietveld Analysis and Electrical Properties of BiInO3 Doped KNN-Based Ceramics.

Rietveld refinement is used to investigate the crystal structure of prepared (0.965 - x)(K0.48Na0.52)NbO3- xBiInO3-0.035(Bi0.5Na0.5)ZrO3 (KNN- xBI-BNZ) ceramics. From refined results, the distortion degree of crystal structures in KNN- xBI-BNZ ceramics presents a rising trend with BiInO3 modification, which is in keeping with the results of diffuseness. The spontaneous polarization ( Ps) is also calculated using refined structural parameters. The submicron domains are observed when x = 0.004, which presents good electrical properties ( d33 = 317 pC/N, Tc = 336 °C) simultaneously. Excellent thermal stability of ceramics modified with BiInO3 is observed in a broad temperature range.

Effects of Yb3+ doping on phase structure, thermal conductivity and fracture toughness of (Nd1-xYbx)2Zr2O7

To investigate the effects of Yb3+ doping on phase structure, thermal conductivity and fracture toughness of bulk Nd2Zr2O7, a series of (Nd1-xYbx)2Zr2O7 (x = 0, 0.2, 0.4, 0.6, 0.8, 1.0) ceramics were synthesized using a solid-state reaction sintering method at 1600 °C for 10 h. The phase structures were sensitive to the Yb3+ content. With increasing doping concentration, a pyrochlore-fluorite transformation of (Nd1-xYbx)2Zr2O7 ceramics occurred. Meanwhile, the ordering degree of crystal structure decreased. The substitution mechanism of Yb3+ doping was confirmed by analyzing the lattice parameter variation and chemical bond of bulk ceramics. The thermal conductivities of (Nd1-xYbx)2Zr2O7 ceramics decreased first and then increased with the increase of Yb3+ content. The lowest thermal conductivity of approximately 1.2 W m−1 K−1 at 800 °C was attained at x = 0.4, around 20% lower than that of pure Nd2Zr2O7. Besides, the fracture toughness reached a maximum value of ~1.59 MPa m1/2 at x = 0.8 but decreased with further increasing Yb3+ doping concentration. The mechanism for the change of fracture toughness was discussed to result from the lattice distortion and structure disorder caused by Yb3+ doping.

Piezoelectric performance, phase transitions, and domain structure of 0.96(K0.48Na0.52)(Nb0.96Sb0.04)O3−0.04(Bi0.50Na0.50)ZrO3 ceramics

Demand for replacing the current lead-based piezoelectric materials with some lead-free ones becomes increasingly strong from environmental concerns. In this article, we report the piezoelectric performance, the phase transitions, and the domain configurations of highly dense 0.96(K0.48Na0.52)(Nb0.96Sb0.04)O3−0.04(Bi0.50Na0.50)ZrO3 ceramics prepared by two step-sintering through solid-state reaction. This material has outstanding piezoelectric properties of piezoelectric coefficient d33 = 512 pC/N and electromechanical coupling coefficient kp ≈ 0.56 at room temperature. While d33 exhibits a broad peak and is greater than 430 pC/N between −30 °C and 70 °C, kp depends weakly on temperature below 50 °C but decreases considerably with further increasing the temperature. In terms of thermal aging, both d33 and kp remain stable from −50 °C to 240 °C. The degradation of kp quickly stabilizes in the first thermal cycle between −50 °C and 150 °C. Furthermore, the measurement of relative dielectric permittivity ε′ upon heating indicates that rhombohedral-orthorhombic, orthorhombic-tetragonal, and tetragonal-cubic phase transitions occur at TR-O ≈ −40 °C, TO-T ≈ 54 °C, and TC ≈ 265 °C, respectively. The X-ray diffraction analysis shows that the crystalline structure at room temperature is of orthorhombic-tetragonal phase coexistence. We also investigate the domain structure with an acid etching technique. The unpoled ceramic exhibits a complicated domain pattern consisting of irregularly shaped domains of long parallel stripes separated by 180° domain boundaries from neighboring domains. In contrast, upon poling, the domain pattern becomes simpler and takes the form of long parallel stripes of diverse widths, with a hierarchical nanodomain structure appearing inside some of the broader stripes. We consider that the superior piezoelectric properties and reasonable temperature stability are closely related to the rhombohedral-orthorhombic and orthorhombic-tetragonal phase transitions and to the characteristic domain structure.

High Piezoelectric Properties and High <i>T</i><sub>C</sub> in KNN-Based Lead-Free Ceramics Sintered in Reducing Atmosphere

Lead-free MnO doped 0.955K0.5Na0.5NbO3-0.045Bi0.5Na0.5ZrO3(abbreviate as KNN-0.045BNZ) ceramics have been prepared by a conventional solid-state sintering method in a reducing atmosphere. The addition of MnO suppresses grain growth and eliminates the liquid phase. MnO dopant changes the crystalline structures of KNN-0.045BNZ ceramics from the classical Morphotropic Phase Boundary (MPB) with rhombohedral phase (R) and tetragonal phase (T) to the suppressed MPB with R/T phase. The 0.4% MnO doped KNN-0.045BNZ ceramics show an excellent electrical properties with quasi static piezoelectric constantd33=300 pC/N, Curie temperatureTC= 350 °C, insulation resistivity ρ=4.83 × 1011(Ω・cm), and high field piezoelectric constants =438 pm/V (atEmax= 25 kV/cm). The results indicate that the 0.4%Mn doped KNN-0.045BNZ ceramic is a promising lead-free piezoelectric candidate material for commercial applications.

Modifying Temperature Stability of (K,Na)NbO3 Ceramics through Phase Boundary

Abstract(0.99‐x)(K0.5Na0.5)(Nb0.965Sb0.035)O3‐0.01SrZrO3‐x(Bi0.5Na0.5)ZrO3 ceramics are chosen as an example to illustrate the effects of phase boundaries on strain. Temperature‐dependent dielectric permittivity and convergent beam electron diffraction patterns confirm the multiphase coexistence of rhombohedral, orthorhombic, and tetragonal phases in the ceramics with x = 0.03–0.04. Intriguingly, the ceramics with x = 0.03 display improved temperature stability in strain, e.g., a high retention (≈95%) of unipolar strain at 180 °C and low variation of 24% at 20–180 °C. A mode is proposed to show how to effectively tailor the strain and consolidate its temperature stability in potassium sodium niobate‐based ceramics.

Microstructure, Dielectric and Piezoelectric Properties of (1 − x)(Na0.52K0.443Li0.037)(Nb0.883Sb0.08Ta0.037)O3 − x(Sr0.95Ca0.05)ZrO3 Ceramics

In this paper, in order to develop the composition ceramics for piezoelectric actuator. (1 − x)(Na0.52K0.443Li0.037)(Nb0.883Sb0.08Ta0.037)O3 − x(Sr0.95Ca0.05)ZrO3 ceramics were sintered at 1020 °C by the conventional solid-state method. The effects of (Sr0.95Ca0.05)ZrO3 substitution on their microstructure and piezoelectric properties were systematically investigated. The orthorhombic-tetragonal coexistence phase has been found in the ceramics with x = 0.01, 0.015 and x = 0.02. The maximum value of d33 was 322 pC/N at x = 0.025 composition ceramics with the rhombohedral phase. The (Sr0.95Ca0.05)ZrO3 substitution increased the density and then aided the grain growth of specimens. When x = 0.01, the optimal physical properties of d33 = 254 pC/N, er = 1096, kp = 0.46, and Qm = 156 were obtained, respectively, for piezoelectric actuator application.

Temperature stability and electrical properties in La‐doped KNN‐based ceramics

AbstractTo improve the temperature stability and electrical properties of KNN‐based ceramics, we simultaneously consider the phase boundary and the addition of rare earth element (La), 0.96K0.5Na0.5Nb0.96Sb0.04O3‐0.04(Bi1‐xLax)0.5Na0.5ZrO3 (0 ≤ x ≤ 1.0) ceramics. More specifically, we investigate how the phase boundary and the addition of La3+ affect the phase structure, electrical properties, and temperature stability of the ceramic. We show that increasing the La3+ content leads to a change in phase structure, from a rhombohedral‐tetragonal (R‐T) phase coexistence to a cubic phase. More importantly, we show that the appropriate addition of La3+ (x = 0.2) can simultaneously improve the unipolar strain (from 0.127% to 0.147%) and the temperature stability (i.e., the unipolar strain of 0.147% remains unchanged when T is increased from 25 to 80°C). In addition, we find that the ceramics with x = 0.2 exhibit a large piezoelectric constant (d33) of ~430 pC/N, a high Curie temperature (TC) of ~240°C and a fatigue‐free behavior (after 106 electric cycles). The enhanced electrical properties mostly originate from the easy domain switching, whereas the improved temperature stability can be attributed to the R‐T phase boundary and the appropriate addition of La3+.

The effect of microstructure on piezoelectric properties and temperature stability for MnO doped KNN-based ceramics sintered in different atmospheres

Lead-free 0.4% MnO doped 0.955K0.5Na0.5NbO3-0.045Bi0.5Na0.5ZrO3 (Abbreviated as 0.955KNN-0.045BNZ) ceramics were prepared by a conventional solid-state sintering method in both ambient air and reducing atmosphere (H2/N2/H2O, oxygen partial pressure po2 = 1 × 10−10 atm). All samples show a polymorphic phase boundary (PPB) with rhombohedral (R)/tetragonal (T) phase. The R phase fraction of ceramics sintered in reducing atmosphere is higher than that of ceramics sintered in ambient air. The valence state of almost all of the Mn ions are +2 for the ceramics sintered in reducing atmosphere. Mixed valence states (+2, +3, +4) of Mn ions coexist in the 0.4% MnO doped 0.955KNN-0.045BNZ ceramic sintered in air. The formation of dipolar defect (MnNb′-Vo·· and MnNb″-Vo··) in poled ceramics sintered in air is due to the substitution of Nb5+ ions with Mn3+ ions and Mn4+ ions. The ceramics sintered in air show strong dielectric diffusion behavior under electric field (35 kV/cm) due to the existence of (∼200 nm) sub-micrometer domains with high activation energy. Nanoscale domains (∼90 nm) in ceramics sintered in reducing atmosphere is the origin of its high piezoelectric properties.

Reduced hysteresis of KNNS-BNKZ piezoelectric ceramics through the control of sintering temperature

The hysteresis of piezoelectric ceramics plays an important role in determining errors when they are applied in actuators. However, the relationships between the hysteresis characteristic, preparation process of the piezoelectric ceramic, and displacement error of the actuator have rarely been systematically studied. In this study, 0.9625(K0.48Na0.52)(Nb0.6Sb0.4)O3-0.0375Bi0.5(Na0.82K0.18)0.5ZrO3 (KNNS-BNKZ) ceramics were prepared via a solid-state reaction and sintered at 1140 °C, 1160 °C, and 1180 °C. Subsequently, the influence of sintering temperatures on the phase composition, microstructure, piezoelectric properties, and ferroelectric properties of the samples was studied. Furthermore, the factors affecting the hysteresis characteristics were systematically analyzed. The results showed that the ceramic sintered at 1140 °C possessed the smallest hysteresis with Hmax = 25% owing to its phase composition and microstructure. Additionally, linear regression of the displacement versus voltage was carried out and the corresponding equations were obtained. Finally, the hysteresis model of the ceramic sintered at 1140 ℃ was established and its error was determined to be less than 1.81%, which renders these ceramics suitable for application in high-precision actuators.

Multi-phase structure and electrical properties of Bi0.5Li0.5ZrO3 doping K0.48Na0.56NbO3 lead-free piezoelectric ceramics

(1–x)K0.48Na0.56NbO3–xBi0.5Li0.5ZrO3 (KNN–xBLZ, x = 0–0.06) lead-free piezoelectric ceramics were prepared by the conventional solid-state sintering method, and their phase structures and electric properties as well as TC were systematically investigated. The orthorhombic–tetragonal (O–T) two phases were detected in all (1–x)K0.48Na0.56NbO3–xBi0.5Li0.5ZrO3 ceramics at 0.01 ≤ x ≤ 0.05. Due to the appropriate ratio between O phase and T phase (CO/CT= 45/55), high piezoelectric properties of d33 = 239 pC/N, kp = 34%, and Pr = 25.23 μC/cm2 were obtained at x = 0.04. Moreover, a high TC = 348°C was also achieved in KNN–xBLZ ceramic at x = 0.04. These results indicate that (1–x)K0.48Na0.56NbO3–xBi0.5Li0.5ZrO3 system is a promising candidate for high-temperature piezoelectric devices.

Defect engineering on phase structure and temperature stability of KNN‐based ceramics sintered in different atmospheres

AbstractLead‐free MnO‐doped 0.955K0.5Na0.5NbO3‐0.045Bi0.5Na0.5ZrO3 (Abbreviated as KNN‐0.045BNZ) ceramics have been prepared by the conventional solid‐state sintering method in reducing atmosphere ( = 1 × 10−10 atm) and air. For ceramics sintered in reducing atmosphere, only Mn2+ ions exist in ceramics who preferentially occupy the cation vacancies in A‐site at x = 0.2‐0.4, whereas Mn2+ ions substitute for Zr4+ ions in B‐site to form defects () at x > 0.4. For ceramics sintered in air, mixed Mn2+, Mn3+, and Mn4+ ions coexist here. The Mn2+ ions preferentially occupy the cation vacancies in A‐site at x = 0.2‐0.4 and then Mn2+ ions substitute for Zr4+ ions in B‐site at x > 0.4. Meanwhile, the Mn3+ ions and Mn4+ ions substitute for Nb5+ ions in B‐site to form defects () at x = 0.2‐0.8. The (, , and ) dipolar defects show a positive dipolar defect contribution (DDC) to the , whereas the dipolar defects () show a negative DDC to the . The dipolar defects ( ‐ and ) can help improve the temperature stability of . The 0.4% MnO‐doped KNN‐0.045BNZ ceramics sintered in reducing atmosphere show excellent piezoelectric constant d33 = 300 pC/N and 0.2% MnO‐doped KNN‐0.045BNZ ceramics sintered in air possess optimal piezoelectric constant d33 = 290 pC/N.

Temperature stability and electrical properties of MnO‐doped KNN‐based ceramics sintered in reducing atmosphere

AbstractLead‐free MnO‐doped 0.955K0.5Na0.5NbO3‐0.045Bi0.5Na0.5ZrO3 (abbreviate as KNN‐0.045BNZ) ceramics have been prepared by a conventional solid‐state sintering method in reducing atmosphere. The MnO addition can suppress the emergence of the liquid phase and improve the homogenization of grain size. All ceramics sintered in reducing atmosphere show a two‐phase coexistence zone composed of rhombohedral (R) and tetragonal (T) phase. MnO dopant results in the content increase in R phase and slight increase in Curie temperature TC. For KNN‐0.045BNZ ceramics, Mn2+ ions preferentially occupy the cation vacancies in A‐site to decrease oxygen vacancy concentration for 0.2%‐0.4% MnO content, whereas Mn2+ ions substitute for Zr4+ ions in B‐site to form oxygen vacancies at x ≥ 0.5. The defect dipole is formed at the moderate concentration from 0.5 to 0.6, which can provide a preserve force to improve the temperature stability of piezoelectric properties for kp and . The Mn0.4 ceramics show excellent electrical properties with quasistatic piezoelectric constant d33 = 300 pC/N, electromechanical coupling coefficient kp = 51.2%, high field piezoelectric constant = 430 pm/V (at Emax = 25 kV/cm) and TC = ~345°C, insulation resistivity ρ = 6.13 × 1011 Ωcm.

Composition design, electrical properties, and temperature stability in (1 - x)K0.44Na0.56Nb0.96Sb0.04O3-xBi0.45La0.05Na0.5ZrO3 lead-free ceramics.

In this work, we designed a new system of (1 − x)K0.44Na0.56Nb0.96Sb0.04O3-xBi0.45La0.05Na0.5ZrO3 (KNNS-xBLNZ, 0 ≤ x ≤ 0.06) ceramics, and systemically investigated both their electrical performance and temperature stability. Through optimizing the composition, a relatively good comprehensive performance (e.g., d33 ∼ 455 ± 10 pC N−1, kp ∼ 0.47 ± 0.02, TC ∼ 266 °C, strain ∼ 0.148%, and ) is obtained in the ceramics with x = 0.040, which is attributed to the construction of a rhombohedral–orthorhombic–tetragonal (R–O–T) phase boundary. Moreover, a good temperature stability of remnant polarization (Pr) as well as strain value (Pr100 °C/PrRT ∼ 89.6%, Pr180 °C/PrRT ∼ 73.2%, S100 °C/SRT ∼ 92.6%, S180 °C/SRT ∼ 74.1%) is gained in KNNS-0.040BLNZ ceramics with a broad temperature range from room temperature to 180 °C. Hence, we believe that KNNS-xBLNZ ceramics opens a window for the practical application of lead-free ceramics.

Enhanced electrical properties, phase structure, and temperature-stable dielectric of (K0.48Na0.52)NbO3-Bi0.5Li0.5ZrO3 ceramics

(1-x)(K0.48Na0.52)NbO3-xBi0.5Li0.5ZrO3 (KNN-xBLZ, 0 ≤ x ≤ 0.05) lead-free ceramics were prepared by the conventional solid-state technique. The evolution of their phase structure and electrical properties was systematically investigated as a function of the amount of BLZ. An orthorhombic-tetragonal (O-T) phase was found in the composition range of 0.02 ≤ x ≤ 0.05, and obtained an enhanced electrical property (e.g., d33 ~ 265 pC/N, kp ~ 36.5%, TC ~ 364°C, εr ~ 1210, tan δ ~ 0.032, and Pr ~ 27.5μC/cm2) in the ceramics with x = 0.03. Notably, a good temperature-stable dielectric [εr(300°C) / εr(20°C) ≈ 1.07%] was observed in a broad temperature range from 20°C to 300°C at x =0.03, which was benefited from the contributions of TO-T closing to the room temperature and high TC to avoid the sudden change in dielectric properties at the temperature range of 20–300°C, indicating that such a material may have great potential for high temperature applications.