当前位置: X-MOL 学术J. Electroceram. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Dielectric and electrical studies on iron oxide (α-Fe 2 O 3 ) nanoparticles synthesized by modified solution combustion reaction for microwave applications
Journal of Electroceramics ( IF 1.7 ) Pub Date : 2020-10-12 , DOI: 10.1007/s10832-020-00219-2
Mubashir Qayoom , Khurshed Ahmad Shah , Altaf Hussain Pandit , Arfat Firdous , Ghulam Nabi Dar

Hematite (α-Fe2O3) nanoparticles were synthesized by modified solution combustion method using a mixture of hexamethylenetetramine (HMTA) and glycine fuels at fuel to oxidant molar ratio (ϕ = 1) and fuel (HMTA) to fuel (glycine) weight ratio (1:3). DC-conductivity and dielectric studies of (α-Fe2O3) nanostructures were reported as a function of temperature. Above room temperature (RT), the conductivity showed an increasing trend with temperature which confirmed the semiconducting behaviour of the material. The conductivity behaviour followed Motts law which confirmed the three dimensional variable range hopping (3D VRH) mechanism in the synthesized system. Dielectric studies were carried out at room temperature with frequency range (1000 Hz to 1.5 MHz) as well as varying temperature (100 °C to 400 °C) at different frequencies (0.1 MHz, 0.3 MHz, 1 MHz, 1.3 MHz, and 1.5 MHz).The dielectric permittivity (є’)and tangent loss (tan δ) was found to increase with increase in temperature. In this synthesised material low value of dielectric loss was observed which depicted these materials as potential candidates for microwave applications. More than that studied material was characterised by Raman spectroscopy which revealed that seven active Raman modes were present with different intensities, namely two “A1g” modes (225 and 498 cm−1) and five “Eg” modes (247, 293, 299, 412 and 613 cm−1). The most representative band present in the synthesised iron oxide nanoparticles was found at 225 cm−1.



中文翻译:

微波改性溶液燃烧反应合成纳米氧化铁(α-Fe2 O 3)的介电研究。

赤铁矿(α-的Fe 2 ö 3)(甘氨酸)的重量的纳米颗粒通过使用六亚甲基四胺(HMTA),并在燃料甘氨酸燃料与氧化剂的摩尔比(φ= 1)和燃料(HMTA),以燃料的混合物改性溶液燃烧方法合成比例(1:3)。DC-电导率和(α-铁电介质的研究2 ö 3纳米结构被报告为温度的函数。高于室温(RT)时,电导率随温度呈上升趋势,这证实了材料的半导体性能。电导率行为遵循莫特斯定律,证实了合成系统中的三维可变范围跳变(3D VRH)机制。介电研究是在室温下以频率范围(1000 Hz至1.5 MHz)以及在不同频率(0.1 MHz,0.3 MHz,1 MHz,1.3 MHz和1.5)下变化温度(100°C至400°C)进行的介电常数(є')和切线损耗(tanδ)随着温度的升高而增加。在这种合成的材料中,观察到低的介电损耗值,将其描述为微波应用的潜在候选材料。1g英寸模式(225和498 cm -1)和五种“ E g ”模式(247、293、299、412和613 cm -1)。发现在合成的氧化铁纳米颗粒中存在的最具代表性的谱带为225 cm -1

更新日期:2020-10-12
down
wechat
bug