scholarly journals Effect of γ-Irradiation and Calcination Temperature of Nanosized ZnO/TiO2 System on Its Structural and Electrical Properties

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
Abdelrahman A. Badawy ◽  
Shaymaa E. El-Shafey ◽  
Suzan Abd El All ◽  
Gamil A. El-Shobaky
Keyword(s):  
Electrical Properties ◽  
Calcination Temperature ◽  
Sol Gel ◽  
Ammonium Hydroxide ◽  
Rutile Phase ◽  
Degree Of Crystallinity ◽  
Γ Irradiation ◽  
Mobility Of Charge Carriers ◽  
Structural And Electrical Properties ◽  
The Matrix

ZnO/TiO2 powders were synthesized by sol-gel method using ammonium hydroxide. The effects of calcination temperature (500–1000°C) and gamma rays (with doses from 25 to 150 kGy) on the phases present and their electrical properties were investigated. The results revealed that heating the system investigated at 500°C led to the formation of ZnTiO3-rohom and TiO2-rutile. The degree of crystallinity of the phases produced increased by increasing the calcination temperature. When heating at 1000°C, ZnTiO3-rohom turned to ZnTiO3-cubic but the rutile phase remained stable. γ-Irradiation decreased considerably the crystallite size of the rutile phase from 146 to 63 nm and that of ZnTiO3-cubic decreased from 101 to 39 nm. This treatment led also to the creation of holes in the matrix of irradiated solids which increased the mobility of charge carriers (electrons) leading to a significant increase in the electrical conductivity reaching to 102 to 103-fold.

Structural and electrical properties of sol–gel grown nanostructured ZnO and LaMnO3 particle-based nanocomposites

2021 ◽  
Vol 127 (2) ◽  
Author(s):  
Naisargi Kanabar ◽  
Keval Gadani ◽  
V. G. Shrimali ◽  
Khushal Sagapariya ◽  
K. N. Rathod ◽  
...  
Keyword(s):  
Electrical Properties ◽  
Sol Gel ◽  
Structural And Electrical Properties

Study of the structural and electrical properties of PMNT 68/32 ceramic prepared by a sol–gel process

2005 ◽  
Vol 78 (4) ◽  
pp. 329-336 ◽  
Author(s):  
Pawan Kumar ◽  
O. P. Thakur ◽  
Chandra Prakash ◽  
T. C. Goel
Keyword(s):  
Electrical Properties ◽  
Sol Gel ◽  
Structural And Electrical Properties ◽  
Sol Gel Process

Structural and Electrical Properties of La0.7Ca0.3MnO3 /α-Fe2O3 Composites

2021 ◽  
Vol 317 ◽  
pp. 66-71
Author(s):  
Lik Nguong Lau ◽  
Kean Pah Lim ◽  
Amirah Natasha Ishak ◽  
Mohd Mustafa Awang Kechik ◽  
Soo Kien Chen ◽  
...  
Keyword(s):  
Electrical Properties ◽  
Sol Gel ◽  
Parent Compound ◽  
Mixed Valence ◽  
Space Group ◽  
Colossal Magnetoresistive ◽  
Structural And Electrical Properties ◽  
Modern Application ◽  
Xrd Patterns ◽  
Insulating Phase

Colossal magnetoresistive (CMR) materials have huge potential in modern application and it has been widely used in magnetic sensing industry. From the literature, an incorporation of secondary insulating phase into mixed-valence manganites could improve its extrinsic effect especially low-field magnetoresistance (LFMR). However, nanoparticle addition could lead to substitution and diffusion with its parent compound. In this work, the structural and electrical properties of La0.7Ca0.3MnO3 (LCMO) were investigated by adding the α-Fe2O3 nanoparticle with ratio of 0.00, 0.05, 0.10, 0.15 and 0.20 as the artificial grain boundaries. The LCMO compound has been synthesised using sol-gel route. The samples were chosen to sinter at 800°C to obtain the pure LCMO phase by referring to the thermogravimetric analysis (TGA). The structural properties were investigated by an X-ray diffractometer (XRD) while electrical properties were measured by a four-point probe (4PP) system. XRD patterns showed the coexistence of two phases (LCMO & α-Fe2O3). LCMO crystallised in orthorhombic structure with space group Pnma while α-Fe2O3 exhibited in hexagonal form with space group R-3c. As the content of α-Fe2O3 increases, the resistivity of the samples increases drastically. Nevertheless, the addition of iron oxide has no significant effect on the metal-insulator transition temperature (T­MI). From the XRD and 4PP analysis, it can be deduced that the α-Fe2O3 nanoparticles do not react with LCMO compound and successfully formed the La0.7Ca0.3MnO3 /α-Fe2O3 composites. The resistivity increases when the nano-sized α-Fe2O3 is added into LCMO nanocomposites due to the insulator nature of α-Fe2O3.

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