CN114573334A - 高功率高居里温度低线宽石榴石铁氧体及制备方法 - Google Patents
高功率高居里温度低线宽石榴石铁氧体及制备方法 Download PDFInfo
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Abstract
一种高功率高居里温度低线宽石榴石铁氧体,属于铁氧体材料制备技术领域。所述石榴石铁氧体包括主配方和添加剂,主配方为Y3‑x‑z‑ tGdx‑yDyzCatInwGetFe5‑w‑t‑δO12‑1.5δ‑1.5y,0.01≤t≤2.00,0≤w≤1.00,0.02≤x≤2.00,0.05≤y≤0.8,0.01≤z≤0.3,0≤δ≤0.6;添加剂占主配方的重量百分比为:0.02~0.30wt%Bi2O3、0.02~0.30wt%BaTiO3。本发明通过减少主配方中的Gd3+含量,在24c位引入空位,得到了兼具高功率、低铁磁共振线宽ΔH以及高居里温度Tc的石榴石铁氧体。
Description
技术领域
本发明属于铁氧体材料制备技术领域,具体涉及一种高功率高居里温度低线宽石榴石铁氧体及制备方法。
背景技术
随着5G通信的高速发展,其要求的小型化、高功率器件,促使其中的微波器件往更高的带宽和功率、更低的损耗方向发展,这就要求用于微波器件中的关键核心材料—石榴石铁氧体必须兼具高饱和磁化强度(4πMs)、高自旋波线宽(ΔHk)与低铁磁共振线宽(ΔH),与此同时,为了提高器件的高温可靠性,往往还需要具有更高的居里温度(Tc)。
阿尔弗雷德大学纽约州立陶瓷学院的Cho Yong S使用缺铁配方Y3Fe4.85O12,加入0.6wt%SiO2和0.15wt%MnO2的添加剂,利用溶胶-凝胶法制备粉体,粉体在1500℃烧结3小时后,得到的材料饱和磁化强度4πMs为1576Gs,自旋波线宽ΔHk从3.1Oe提高到了12.6Oe,但铁磁共振线宽ΔH高达142Oe(Cho Y S,Burdick V L,Amarksoon R W.Enhancedmicrowave magnetic properties in nonstoichiometric yttrium iron garnets forhigh power applications[J].IEEE Transactions on Magnetics,1998,34(4):1387-1389),另外该方法也不适用于工业化的生产。
中国专利CN110981461A公开的石榴石铁氧体材料化学式组成为Y3-x-y- zGdxCayCuzFe5-a-b-cInaVbAlcO12,在1500℃烧结5小时,材料的自旋波线宽ΔHk只有10.2Oe,饱和磁化强度4πMs仅为850Gs,同时居里温度Tc也仅为190℃。
当前微波铁氧体高功率石榴石材料通常采用钇钆系列石榴石(YGdIG),而高性能的高功率微波铁氧体材料一般要选用钇钆钙钒石榴石(YGdCaVIG)材料。在YGdIG或YGdCaVIG中,Gd3+离子有提高自旋波线宽ΔHk并改善饱和磁化强度4πMs的作用,但它同时也带来铁磁共振线宽ΔH的增大。为了降低铁磁共振线宽ΔH可采用In3+、Sn4+等离子取代八面体位(16a)Fe3+离子,然而取代后居里温度Tc有明显下降。综上,目前的微波石榴石铁氧体材料是无法同时兼顾高功率、高居里温度和低线宽特性的。
发明内容
本发明的目的在于,针对背景技术存在的缺陷,提出了一种高功率高居里温度低线宽石榴石铁氧体及制备方法。
为实现上述目的,本发明采用的技术方案如下:
一种高功率高居里温度低线宽石榴石铁氧体,其特征在于,所述石榴石铁氧体包括主配方和添加剂,所述主配方为Y3-x-z-tGdx-yDyzCatInwGetFe5-w-t-δO12-1.5δ-1.5y,0.01≤t≤2.00,0≤w≤1.00,0.02≤x≤2.00,0.05≤y≤0.8,0.01≤z≤0.3,δ为缺铁量,0≤δ≤0.6;
所述添加剂占主配方的重量百分比为:0.02~0.30wt%Bi2O3、0.02~0.30wt%BaTiO3。
一种高功率高居里温度低线宽石榴石铁氧体的制备方法,其特征在于,包括以下步骤:
步骤1、配料:
以Y2O3,Gd2O3,Dy2O3,CaCO3,In2O3,GeO2,Fe2O3作为原料,按照化学式Y3-x-z-tGdx- yDyzCatInwGetFe5-w-t-δO12-1.5δ-1.5y的比例进行称料,混料;其中,0.01≤t≤2.00,0≤w≤1.00,0.02≤x≤2.00,0.05≤y≤0.8,0.01≤z≤0.3,0≤δ≤0.6;
步骤2、一次球磨:
将步骤1得到的粉料进行一次球磨,球磨时间为4~8小时;
步骤3、预烧:
将步骤2得到的一次球磨料烘干后,在900~1200℃温度下预烧1~4h,得到主配方;
步骤4、掺杂:
在步骤3得到的粉料中加入添加剂,添加剂占主配方的重量百分比为:0.02~0.30wt%Bi2O3、0.02~0.30wt%BaTiO3;
步骤5、二次球磨:
将步骤4得到的粉料进行二次球磨,球磨时间为4~8小时;
步骤6、成型:
在步骤5得到的粉料中加入10~15wt%的PVA粘合剂,造粒、成型,并压制成坯件;
步骤7、烧结:
将步骤6成型后得到的坯件置于烧结炉内进行烧结,烧结温度为1250~1500℃,烧结时间为2~6小时,烧结完成后,自然冷却至室温,取出,即可得到所述石榴石铁氧体。
本发明提供的一种高功率高居里温度低线宽石榴石铁氧体,加入快速弛豫离子(Gd3+、Dy3+),有效提高了自旋波线宽ΔHk,提高了铁氧体材料应用的峰值功率;同时在主配方中减少Gd3+含量(y为Gd3+缺少量,即空位数量),在24c位引入空位,有效降低了铁磁共振线宽ΔH、提高了居里温度Tc和饱和磁化强度4πMs。
与现有技术相比,本发明的有益效果为:
本发明提供的一种高功率高居里温度低线宽石榴石铁氧体,通过减少主配方中的Gd3+含量,在24c位引入空位,得到了兼具高功率、低铁磁共振线宽ΔH以及高居里温度Tc的石榴石铁氧体。
附图说明
图1为对比例与实施例得到的石榴石铁氧体材料的饱和磁化强度4πMs随x值的变化曲线;
图2为对比例与实施例得到的石榴石铁氧体材料的居里温度Tc随x值的变化曲线;
图3为对比例与实施例得到的石榴石铁氧体材料的铁磁共振线宽ΔH随x值的变化曲线;
图4为对比例与实施例得到的石榴石铁氧体材料的自旋波线宽ΔHk随x值的变化曲线;
图5为对比例与实施例得到的石榴石铁氧体材料的SEM图。
具体实施方式
下面结合附图和实施例,详述本发明的技术方案。
一种高功率高居里温度低线宽石榴石铁氧体的制备方法,具体包括以下步骤:
步骤1、配料:
以Y2O3(纯度为99.99%),Gd2O3(纯度为99.99%),Dy2O3(纯度为99.99%),CaCO3(纯度为99%),In2O3(纯度为99.99%),GeO2(纯度为99.99%),Fe2O3(纯度为99.3%)作为原料,按照化学式Y3-x-z-tGdx-yDyzCatInwGetFe5-w-t-δO12-1.5δ-1.5y的比例进行称料,混料;其中,0.01≤t≤2.00,0≤w≤1.00,0.02≤x≤2.00,0.05≤y≤0.8,0.01≤z≤0.3,0≤δ≤0.6;
步骤2、一次球磨:
将步骤1得到的粉料进行一次球磨,球磨时间为5小时;
步骤3、预烧:
将步骤2得到的一次球磨料烘干后,在1050℃温度下预烧3h,得到主配方;
步骤4、掺杂:
在步骤3得到的粉料中加入添加剂,添加剂占主配方的重量百分比为:0.1wt%Bi2O3、0.1wt%BaTiO3;
步骤5、二次球磨:
将步骤4得到的粉料进行二次球磨,球磨时间为5小时;
步骤6、成型:
在步骤5得到的粉料中加入10wt%的PVA粘合剂,造粒、成型,并压制成坯件;
步骤7、烧结:
将步骤6成型后得到的坯件置于烧结炉内进行烧结,烧结温度为1400℃,烧结时间为3小时,烧结完成后,自然冷却至室温,取出,即可得到所述石榴石铁氧体。
实施例与对比例的性能如下表:
图1为对比例与实施例得到的石榴石铁氧体材料的饱和磁化强度4πMs随x值的变化曲线;由图1可知,Gd3+离子取代会导致4πMs降低,但是实施例中减少Gd3+离子配比引入空位后,4πMs明显高于对比例。
图2为对比例与实施例得到的石榴石铁氧体材料的居里温度Tc随x值的变化曲线;由图2可知,减少Gd3+离子配比引入空位的实施例,其Tc呈现上升的趋势,而没有Gd3+离子空位的对比例的Tc基本不变。
图3为对比例与实施例得到的石榴石铁氧体材料的铁磁共振线宽ΔH随x值的变化曲线;由图3可知,实施例减少Gd3+离子配比引入空位后的ΔH明显小于对比例。
图4为对比例与实施例得到的石榴石铁氧体材料的自旋波线宽ΔHk随x值的变化曲线;由图4可知,实施例的ΔHk与对比例相差不大,不影响材料的高功率特性。
图5为对比例与实施例得到的石榴石铁氧体材料的SEM图;由图5可知,随着y的增大(空穴量增多),晶粒逐渐增大,实施例中减少Gd3+离子配比引入空位后,晶粒尺寸大于对比例,这也进一步证明了ΔH降低。
Claims (2)
1.一种高功率高居里温度低线宽石榴石铁氧体,其特征在于,所述石榴石铁氧体包括主配方和添加剂,所述主配方为Y3-x-z-tGdx-yDyzCatInwGetFe5-w-t-δO12-1.5δ-1.5y,0.01≤t≤2.00,0≤w≤1.00,0.02≤x≤2.00,0.05≤y≤0.8,0.01≤z≤0.3,0≤δ≤0.6;
所述添加剂占主配方的重量百分比为:0.02~0.30wt%Bi2O3、0.02~0.30wt%BaTiO3。
2.一种高功率高居里温度低线宽石榴石铁氧体的制备方法,其特征在于,包括以下步骤:
步骤1、配料:
以Y2O3,Gd2O3,Dy2O3,CaCO3,In2O3,GeO2,Fe2O3作为原料,按照化学式Y3-x-z-tGdx- yDyzCatInwGetFe5-w-t-δO12-1.5δ-1.5y的比例进行称料,混料;其中,0.01≤t≤2.00,0≤w≤1.00,0.02≤x≤2.00,0.05≤y≤0.8,0.01≤z≤0.3,0≤δ≤0.6;
步骤2、一次球磨:
将步骤1得到的粉料进行一次球磨,球磨时间为4~8小时;
步骤3、预烧:
将步骤2得到的一次球磨料烘干后,在900~1200℃温度下预烧1~4h,得到主配方;
步骤4、掺杂:
在步骤3得到的粉料中加入添加剂,添加剂占主配方的重量百分比为:0.02~0.30wt%Bi2O3、0.02~0.30wt%BaTiO3;
步骤5、二次球磨:
将步骤4得到的粉料进行二次球磨,球磨时间为4~8小时;
步骤6、成型:
在步骤5得到的粉料中加入PVA粘合剂,造粒、成型,并压制成坯件;
步骤7、烧结:
将步骤6成型后得到的坯件置于烧结炉内进行烧结,烧结温度为1250~1500℃,烧结时间为2~6小时,烧结完成后,自然冷却至室温,取出,即可得到所述石榴石铁氧体。
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