{"title":"Co3O4 和 Co2TiO4 两相尖晶石复合材料的宽带介电光谱研究","authors":"","doi":"10.1016/j.physb.2024.416560","DOIUrl":null,"url":null,"abstract":"<div><div>Broadband dielectric spectroscopy studies of the two-phase composites, (1 – <em>x</em>) Co<sub>3</sub>O<sub>4</sub> + <em>x</em> Co<sub>2</sub>TiO<sub>4,</sub> have been reported over a wide range of compositions (0 ≤ <em>x</em> ≤ 1) and temperatures (80 K ≤ T ≤ 573 K). Normal spinel Co<sub>3</sub>O<sub>4</sub> and inverse spinel Co<sub>2</sub>TiO<sub>4</sub> phases are well distinguishable with ∼4.6 % variation in the lattice parameter of the Co<sub>3</sub>O<sub>4</sub> phase with an increase of <em>x</em> from 0 to <em>x</em> = 1. The ac-conductivity (σ) of this composite follows Johnscher's power law (∼Aω<sup>s</sup>) variation with frequency exponent factor ‘s’ both greater than as well as less than unity. The temperature dependence of ‘σ’ reveals the Arrhenius-like behavior instead of variable range hopping of charge carriers with activation energy in the 2–1800 meV range. Systematic analysis of such conductivity mechanisms for all the compositions is compared with the pristine Co<sub>3</sub>O<sub>4</sub> system.</div></div>","PeriodicalId":20116,"journal":{"name":"Physica B-condensed Matter","volume":null,"pages":null},"PeriodicalIF":2.8000,"publicationDate":"2024-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Broadband dielectric spectroscopy studies of Co3O4 and Co2TiO4 two-phase spinel composites\",\"authors\":\"\",\"doi\":\"10.1016/j.physb.2024.416560\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><div>Broadband dielectric spectroscopy studies of the two-phase composites, (1 – <em>x</em>) Co<sub>3</sub>O<sub>4</sub> + <em>x</em> Co<sub>2</sub>TiO<sub>4,</sub> have been reported over a wide range of compositions (0 ≤ <em>x</em> ≤ 1) and temperatures (80 K ≤ T ≤ 573 K). Normal spinel Co<sub>3</sub>O<sub>4</sub> and inverse spinel Co<sub>2</sub>TiO<sub>4</sub> phases are well distinguishable with ∼4.6 % variation in the lattice parameter of the Co<sub>3</sub>O<sub>4</sub> phase with an increase of <em>x</em> from 0 to <em>x</em> = 1. The ac-conductivity (σ) of this composite follows Johnscher's power law (∼Aω<sup>s</sup>) variation with frequency exponent factor ‘s’ both greater than as well as less than unity. The temperature dependence of ‘σ’ reveals the Arrhenius-like behavior instead of variable range hopping of charge carriers with activation energy in the 2–1800 meV range. Systematic analysis of such conductivity mechanisms for all the compositions is compared with the pristine Co<sub>3</sub>O<sub>4</sub> system.</div></div>\",\"PeriodicalId\":20116,\"journal\":{\"name\":\"Physica B-condensed Matter\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":2.8000,\"publicationDate\":\"2024-09-21\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Physica B-condensed Matter\",\"FirstCategoryId\":\"101\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S0921452624009013\",\"RegionNum\":3,\"RegionCategory\":\"物理与天体物理\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q2\",\"JCRName\":\"PHYSICS, CONDENSED MATTER\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Physica B-condensed Matter","FirstCategoryId":"101","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0921452624009013","RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"PHYSICS, CONDENSED MATTER","Score":null,"Total":0}
引用次数: 0
摘要
对两相复合材料((1 - x) Co3O4 + x Co2TiO4)进行了宽带介电光谱研究,研究范围包括成分(0 ≤ x ≤ 1)和温度(80 K ≤ T ≤ 573 K)。正尖晶石 Co3O4 和反尖晶石 Co2TiO4 可很好地区分,随着 x 值从 0 增加到 x = 1,Co3O4 相的晶格参数变化了 4.6%。这种复合材料的交流电导率(σ)随着频率指数因子 "s "的增大和减小而呈现约翰舍尔幂律(∼Aωs)变化。σ "的温度依赖性揭示了类似阿伦尼乌斯的行为,而不是活化能在 2-1800 meV 范围内的电荷载流子的可变范围跳跃。对所有成分的这种传导机制的系统分析与原始 Co3O4 系统进行了比较。
Broadband dielectric spectroscopy studies of Co3O4 and Co2TiO4 two-phase spinel composites
Broadband dielectric spectroscopy studies of the two-phase composites, (1 – x) Co3O4 + x Co2TiO4, have been reported over a wide range of compositions (0 ≤ x ≤ 1) and temperatures (80 K ≤ T ≤ 573 K). Normal spinel Co3O4 and inverse spinel Co2TiO4 phases are well distinguishable with ∼4.6 % variation in the lattice parameter of the Co3O4 phase with an increase of x from 0 to x = 1. The ac-conductivity (σ) of this composite follows Johnscher's power law (∼Aωs) variation with frequency exponent factor ‘s’ both greater than as well as less than unity. The temperature dependence of ‘σ’ reveals the Arrhenius-like behavior instead of variable range hopping of charge carriers with activation energy in the 2–1800 meV range. Systematic analysis of such conductivity mechanisms for all the compositions is compared with the pristine Co3O4 system.
期刊介绍:
Physica B: Condensed Matter comprises all condensed matter and material physics that involve theoretical, computational and experimental work.
Papers should contain further developments and a proper discussion on the physics of experimental or theoretical results in one of the following areas:
-Magnetism
-Materials physics
-Nanostructures and nanomaterials
-Optics and optical materials
-Quantum materials
-Semiconductors
-Strongly correlated systems
-Superconductivity
-Surfaces and interfaces