Li4x/3Co2-2xTi1+2x/3O4 spinel solid solutions: order and disorder phase transition, cations distribution and adjustable microwave dielectric properties

Tan Xianghu; Zhou Huanfu; Tang Yuxin; Zhou Di; Kanhere Pushkar; Tay Qiuling; Chen Xiuli

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Li4x/3Co2-2xTi1+2x/3O4 spinel solid solutions: order and disorder phase transition, cations distribution and adjustable microwave dielectric properties

机译：Li4x / 3Co2-2-2-2-XTi1 + 2x / 3O4尖晶石固体溶液：顺序和紊乱相转变，阳离子分布和可调节的微波介电性能

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A series of spinel solid solutions Li4x/3Co2-2xTi1+2x/3O4 (LCT, 0.2 <= x <= 0.8) were synthesized and their structures and microwave dielectric properties were characterized in detail. The distribution of cations at A and B sites in the lattice has been analyzed by using Rietveld refinement. The microstructure and dielectric properties were studied by scanning electron microscope and microwave network analyzer. The solid solutions undergo a discontinuous B-site, Li/Ti order-disorder phase transition from a disordered cubic phase to an ordered cubic phase with increasing x values from 0.4 to 0.6. With increasing the A-site lithium content, the LCT ceramics exhibit improved dielectric permittivity epsilon(r) (20.3-26.5), high Q x f value (>= 29 400 GHz) and a tailored temperature coefficient of resonant frequency tau(f) from -40 to 10 ppm per degrees C. Optimized microwave dielectric properties were achieved for the composition with x = 0.8: epsilon(r) = 26.5, Q x f approximate to 29 400 GHz and tau(f) approximate to 10 ppm per degrees C. A correlation between the cation distribution and microwave dielectric loss is discussed in detail.

机译：一系列尖晶石固溶体Li4x / 3Co2-2xTi1 + 2X / 3O4（LCT，0.2 <= X <= 0.8）的合成和它们的结构和微波介电性能详细表征。在晶格A和B位点阳离子的分布已经通过使用Rietveld精修分析。微观结构和介电性能通过扫描电子显微镜和微波网络分析仪的研究。固溶体经历不连续的B位，从无序立方相到锂/ Ti的有序 - 无序相转变有序立方相随着x值从0.4至0.6。随着A位锂含量的LCT陶瓷显示出从改善介电常数的ε-（R）（20.3-26.5），高Q值XF（> = 29 400千兆赫）和谐振频率的tau（F）的定制的温度系数每摄氏度优化微波介电性能得以实现为具有x = 0.8的组合物-40至10ppm：小量（R）= 26.5，Q XF近似于29 400千兆赫和tau（F）接近每摄氏度10ppm的阳离子分布和微波介电损耗之间的相关性进行了详细的讨论。

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来源
《RSC Advances》 |2017年第81期|共8页
作者
Tan Xianghu; Zhou Huanfu; Tang Yuxin; Zhou Di; Kanhere Pushkar; Tay Qiuling; Chen Xiuli;
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Guilin Univ Technol Sch Mat Sci &

Engn Guilin 541004 Peoples R China;

Guilin Univ Technol Sch Mat Sci &

Engn Guilin 541004 Peoples R China;

Nanyang Technol Univ Sch Mat Sci &

Engn 50 Nanyang Ave Singapore 639798 Singapore;

Xi An Jiao Tong Univ Int Ctr Dielect Res Elect Mat Res Lab Key Lab Minist Educ Xian 710049 Shaanxi Peoples R China;

Nanyang Technol Univ Sch Mat Sci &

Engn 50 Nanyang Ave Singapore 639798 Singapore;

Nanyang Technol Univ Sch Mat Sci &

Engn 50 Nanyang Ave Singapore 639798 Singapore;

Guilin Univ Technol Sch Mat Sci &

Engn Guilin 541004 Peoples R China;

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中图分类化学;
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机译：Li4x / 3Co2-2-2-2-XTi1 + 2x / 3O4尖晶石固体溶液：顺序和紊乱相转变，阳离子分布和可调节的微波介电性能
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Li4x/3Co2-2xTi1+2x/3O4 spinel solid solutions: order and disorder phase transition, cations distribution and adjustable microwave dielectric properties

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