Sintering behavior of ZnO:Al ceramics fabricated by sol‐gel derived nanocrystalline powders

Abstract

ZnO:Al ceramics (Zn:Al, 0.95:0.05) were prepared by using sol-gel derived nanocrystalline powders. XRD patterns of the doped ceramics revealed the existence of both zincite (JCPDS 36-1451) and gahnite (JCPDS 5-0669) phases. Gahnite phase (ZnAl 2 O 4 ) was segregated along the ZnO grain boundaries. At the sintering temperature of 1200 °C, relative density of the undoped and Al doped ceramics were measured as 0.695 and 0.628, respectively. Both grain size and relative density of the ceramics decreased with Al doping.

Two‐Step Sintering of Pristine and Aluminum‐Doped Zinc Oxide Ceramics

“…Based on Han's results, the kinetic exponent ( n ) of pristine ZnO and AZO is taken as 3 and 4, respectively . The grain growth activation energy of pristine ZnO ceramic is estimated to be 169 ± 18 kJ/mol, which is closer to the reported value of 200 kJ/mol . Higher grain growth activation energy is observed in the case of AZO, i.e., 374 ± 36 kJ/mol.…”

“…adopted the TSS method for pristine ZnO and reported a density of 98% with grain size on the order of less than 1 μm. Similarly, other investigators have reported various methods for sintering nanocrystalline or fine‐grained ZnO powder and ceramics . However, the effect of the TSS method on the distribution of dopants in multi‐component ceramics remains unknown.…”

Enhancement of Red Upconversion Emission of ZnS: Er3+/Yb3+ Powders Synthesized via Solid Phase Reaction Method by Introducing Metal Fluoride

“…And there are some small ZnO diffraction peaks (JCPDS card No. 36–1451) [18] observed indicating that the final products of ZnS: Er 3+ /Yb 3+ powders coexisted little ZnO.…”

Characterization, sintering and dielectric properties of nanocrystalline zinc oxide prepared by a citric acid-based combustion route

“…Among the above methods to prepare ZnO, wet chemical synthesis such as sol-gel [20,21] and precipitation method [22,23] have the merits of uniform particle distribution as well as lower processing temperature, but induce impurities in the particles from starting materials and metal ions having a different melting temperature. In comparison with other oxide preparation techniques the combustion method is a low temperature synthesis route, which can produce a more uniform particle distribution.…”