Dabagh Shadab, Chaudhary Kashif, Haider Zuhaib, Ali Jalil
Laser Center, Ibnu Sina Institute for Scientific and Industrial Research, Universiti Teknologi Malaysia, 81310 UTM Johor Bahru, Johor, Malaysia.
J Nanosci Nanotechnol. 2019 Jul 1;19(7):4142-4146. doi: 10.1166/jnn.2019.16331.
Aluminium substituted cobalt-copper CoCuFeAlO₄, (x ═ 0.8) nanoparticles are grown and sintered at different temperature in the range 600 to 900 °C. XRD analysis on nanoparticles prepared at sintered temperatures of 700 °C and 800 °C confirms the spinel structure and presence of hematite phase (alpha ferrite) in them. The dielectric behaviour of the prepared nano-particles is investigated. Although crystallinity improved with increase in sintering temperature and there was a dielectric loss at higher probe analyser frequency. The synthesized nanoparticles an average particle size of 20-24 nm while the FTIR absorption in regions of 586-595 cm and 450-460 cm indicated the presence of intrinsic vibrations of the tetrahedral and octahedral complexes respectively. Electrical resistivity as a function of temperature confirms the semiconducting nature of the Cu-Al substituted cobalt ferrite, and is attributed to the hopping mechanism between Fe Fe ions and Co Cu, Co Al. The lower values of dielectric constants and dielectric losses make Al-Cu doped cobalt ferrite, a potential material for microwave and radio wave absorber applications.
铝取代的钴铜CoCuFeAlO₄（x = 0.8）纳米颗粒在600至900°C的不同温度下生长和烧结。对在700°C和800°C烧结温度下制备的纳米颗粒进行XRD分析，证实了其尖晶石结构以及其中赤铁矿相（α-铁素体）的存在。对制备的纳米颗粒的介电行为进行了研究。尽管结晶度随烧结温度的升高而提高，并且在较高的探针分析仪频率下存在介电损耗。合成的纳米颗粒平均粒径为20 - 24 nm，而在586 - 595 cm和450 - 460 cm区域的FTIR吸收分别表明存在四面体和八面体配合物的固有振动。电阻率随温度的变化证实了铜铝取代的钴铁氧体的半导体性质，这归因于Fe Fe离子与Co Cu、Co Al之间的跳跃机制。较低的介电常数和介电损耗值使铝铜掺杂的钴铁氧体成为微波和无线电波吸收器应用的潜在材料。
