(Ba <sub>1x </sub > Sr <sub> x </sub>)<sub>4</sub>(Sm<sub>0.4</sub > Nd <sub>0.6</sub>)<sub>28/3</sub > Ti <sub>18</sub > O <sub&g...(Ba <sub>1x </sub > Sr <sub> x </sub>)<sub>4</sub>(Sm<sub>0.4</sub > Nd <sub>0.6</sub>)<sub>28/3</sub > Ti <sub>18</sub > O <sub>54</sub>(x = 0.02， 0.04， 0.06， 0.08， 0.1 ) 稳固的解决方案被准备由常规固态反应过程。它被发现那(Ba <sub>1x </sub > Sr <sub> x </sub>)<sub>4</sub>(Sm<sub>0.4</sub > Nd <sub>0.6</sub>)<sub>28/3</sub > Ti <sub>18</sub > O <sub>54</sub> 陶艺充分由 BaSm <sub>2</sub 组成 > Ti <sub>4</sub > O <sub>12</sub> 和乐队 <sub>2</sub > Ti <sub>5</sub > 为所有作文的 O <sub>14</sub> 阶段。增加的 x 价值(0.02 x 0.1 ) 在((Ba <sub>1x </sub > Sr <sub> x </sub>)<sub>4</sub>(Sm<sub>0.4</sub > Nd <sub>0.6</sub>)<sub>28/3</sub > Ti <sub>18</sub > O <sub>54</sub> 陶艺不能仅仅获得高展开更多
The effect of thermal and electrical histories on structure and dielectric behaviors is studied using 0.95(Bi_(0.5)Na_(0.5))_(0.97)(Li_(0.5)Nd_(0.5))_(0.03)TiO_(3)-0.05BaTiO_(3)(abbreviated as BNTLN0.03-BT5)ceramic as...The effect of thermal and electrical histories on structure and dielectric behaviors is studied using 0.95(Bi_(0.5)Na_(0.5))_(0.97)(Li_(0.5)Nd_(0.5))_(0.03)TiO_(3)-0.05BaTiO_(3)(abbreviated as BNTLN0.03-BT5)ceramic as a selected system.Subtle structure change caused by annealing treatment,and pronounced phase transition and domain switching by electrical poling,are observed to occur,respectively.The dielectric constant and its strong frequency dispersion in unpoled samples decrease evidently by electrical poling due to electric field-induced ordered domain.The high temperature Maxwell-Wagner relaxor behavior vanishes by annealing treatment due to the loss of electrical inhomogeneity with interface charging effects.Piezoelectric properties are improved evidently by annealing treatment at 900℃,implying a new appropriate method to improve piezoelectric properties.展开更多
In this work,the (1-x)Bi_(0.5)Na_(0.5)TiO_(3)-xBaNi_(0.5)Nb_(0.5)O_(3)(BNT-BNN;0.00≤x≤ 0.20)ceramics were prepared via a high-temperature solid-state method.The crystalline structures,photovoltaic effect,and electri...In this work,the (1-x)Bi_(0.5)Na_(0.5)TiO_(3)-xBaNi_(0.5)Nb_(0.5)O_(3)(BNT-BNN;0.00≤x≤ 0.20)ceramics were prepared via a high-temperature solid-state method.The crystalline structures,photovoltaic effect,and electrical properties of the ceramics were investigated.According to X-ray diffraction,the system shows a single perovskite structure.The samples show the normal ferroelectric loops.With the increase of BNN content,the remnant polarization(P_(r))and coercive field(E_(c))decrease gradually.The optical band gap of the samples narrows from 3.10 to 2.27 eV.The conductive species of grains and grain boundaries in the ceramics are ascribed to the double ionized oxygen vacancies.The open-circuit voltage(V_(∝))of ~15.7 V and short-circuit current(J_(sc))of ~1450 nA/cm^(2) are obtained in the 0.95BNT-0.05BNN ceramic under 1 sun illumination(AM1.5G,100 mW/cm^(2)).A larger V_(∝) of 23 V and a higher J_(sc) of 5500 nA/cm^(2) are achieved at the poling field of 60 kV/cm under the same light conditions.The study shows this system has great application prospects in the photovoltaic field.展开更多
Microstructure and dielectric behaviors of heating/cooling and bias-field were investigated in lead-free ceramics(1-x)Bi_(0.5)Na_(0.5)TiO_(3)-xBaTiO_(3)(BNT-xBT,x=0,0.02,0.04,0.06,0.08 and 0.10).The relaxor characters...Microstructure and dielectric behaviors of heating/cooling and bias-field were investigated in lead-free ceramics(1-x)Bi_(0.5)Na_(0.5)TiO_(3)-xBaTiO_(3)(BNT-xBT,x=0,0.02,0.04,0.06,0.08 and 0.10).The relaxor characters and the Vogel–Fulcher law of frequency-dependent dielectric properties were analyzed.Three dielectric anomalies with pronounced frequency dispersion at Td,a maximum dielectric with variable frequency-dispersion at Tm and a third Maxwell–Wagner-type relaxation over a wide temperature range in high-temperature region were observed.The significant dielectric thermal hysteresis,low barrier energy,high freezing temperature in heating process and the maximum dielectric tunability appeared in x=0.4 ceramic.展开更多
基金Financial supports of the National Natural Science Foundation of China，the Middle-aged and Young Teachers in Colleges and/or Universities in Guangxi Basic Ability Promotion Project of China (Grant No.KY2016YB534) are gratefully acknowledged by the authors
文摘(Ba <sub>1x </sub > Sr <sub> x </sub>)<sub>4</sub>(Sm<sub>0.4</sub > Nd <sub>0.6</sub>)<sub>28/3</sub > Ti <sub>18</sub > O <sub>54</sub>(x = 0.02， 0.04， 0.06， 0.08， 0.1 ) 稳固的解决方案被准备由常规固态反应过程。它被发现那(Ba <sub>1x </sub > Sr <sub> x </sub>)<sub>4</sub>(Sm<sub>0.4</sub > Nd <sub>0.6</sub>)<sub>28/3</sub > Ti <sub>18</sub > O <sub>54</sub> 陶艺充分由 BaSm <sub>2</sub 组成 > Ti <sub>4</sub > O <sub>12</sub> 和乐队 <sub>2</sub > Ti <sub>5</sub > 为所有作文的 O <sub>14</sub> 阶段。增加的 x 价值(0.02 x 0.1 ) 在((Ba <sub>1x </sub > Sr <sub> x </sub>)<sub>4</sub>(Sm<sub>0.4</sub > Nd <sub>0.6</sub>)<sub>28/3</sub > Ti <sub>18</sub > O <sub>54</sub> 陶艺不能仅仅获得高
基金Part of this work was financially supported by the National Nature Science Foundation of China(11564007,61561015,and 61361007)Guangxi Key Laboratory of Information Materials(1310001-Z)the Natural Science Foundation of Guangxi(2015GXNSFAA 139250).
文摘The effect of thermal and electrical histories on structure and dielectric behaviors is studied using 0.95(Bi_(0.5)Na_(0.5))_(0.97)(Li_(0.5)Nd_(0.5))_(0.03)TiO_(3)-0.05BaTiO_(3)(abbreviated as BNTLN0.03-BT5)ceramic as a selected system.Subtle structure change caused by annealing treatment,and pronounced phase transition and domain switching by electrical poling,are observed to occur,respectively.The dielectric constant and its strong frequency dispersion in unpoled samples decrease evidently by electrical poling due to electric field-induced ordered domain.The high temperature Maxwell-Wagner relaxor behavior vanishes by annealing treatment due to the loss of electrical inhomogeneity with interface charging effects.Piezoelectric properties are improved evidently by annealing treatment at 900℃,implying a new appropriate method to improve piezoelectric properties.
基金financially supported by the National Natural Science Foundation of China(Grant No.11464006)Guangxi Key Laboratory of Information Materials(Grant No.191026-Z).
文摘In this work,the (1-x)Bi_(0.5)Na_(0.5)TiO_(3)-xBaNi_(0.5)Nb_(0.5)O_(3)(BNT-BNN;0.00≤x≤ 0.20)ceramics were prepared via a high-temperature solid-state method.The crystalline structures,photovoltaic effect,and electrical properties of the ceramics were investigated.According to X-ray diffraction,the system shows a single perovskite structure.The samples show the normal ferroelectric loops.With the increase of BNN content,the remnant polarization(P_(r))and coercive field(E_(c))decrease gradually.The optical band gap of the samples narrows from 3.10 to 2.27 eV.The conductive species of grains and grain boundaries in the ceramics are ascribed to the double ionized oxygen vacancies.The open-circuit voltage(V_(∝))of ~15.7 V and short-circuit current(J_(sc))of ~1450 nA/cm^(2) are obtained in the 0.95BNT-0.05BNN ceramic under 1 sun illumination(AM1.5G,100 mW/cm^(2)).A larger V_(∝) of 23 V and a higher J_(sc) of 5500 nA/cm^(2) are achieved at the poling field of 60 kV/cm under the same light conditions.The study shows this system has great application prospects in the photovoltaic field.
基金supported by the National Nature Science Foundation of China(11564007,61561015,51862004,11664006)the Natural Science Foundation of Guangxi(2017GXNSFDA198024,2018GXNSFAA294039)。
文摘Microstructure and dielectric behaviors of heating/cooling and bias-field were investigated in lead-free ceramics(1-x)Bi_(0.5)Na_(0.5)TiO_(3)-xBaTiO_(3)(BNT-xBT,x=0,0.02,0.04,0.06,0.08 and 0.10).The relaxor characters and the Vogel–Fulcher law of frequency-dependent dielectric properties were analyzed.Three dielectric anomalies with pronounced frequency dispersion at Td,a maximum dielectric with variable frequency-dispersion at Tm and a third Maxwell–Wagner-type relaxation over a wide temperature range in high-temperature region were observed.The significant dielectric thermal hysteresis,low barrier energy,high freezing temperature in heating process and the maximum dielectric tunability appeared in x=0.4 ceramic.
基金Financial supports of the National Natural Science Foundation of China，the Natural Science Foundation of Guangxi (Grant No.2014GXNSFBA118254) are gratefully acknowledged by the authors
