Abstract
Metastable nanopowder ZnTiO3 was pressed into cylindrical compacts at 200 MPa. Compacts were treated by conventional heating with isothermal holding at 931?C for 10 minutes, 25 minutes and 40 minutes. ZnTiO3 compacts were also heated with a two-step sintering schedule with maximal 913?C and isothermal holding at 896?C, for approximately the same holding times as the isothermal schedule. Shrinkage during heating was monitored with a dilatometric device, while microstructure was determined with atomic force microscopy. XRD patterns were collected for the most interesting samples. Microstructures of sintered specimens showed differences introduced during the last sintering stage by the two different heating schedules. Goal of the presented work was to discuss the possible sintering mechanisms for the two step sintering schedulle according to the presented results.
Highlights
During sintering of compacted nanopowders, shrinkage measurements indicate intensive sintering kinetic
In this work we analyzed the impact of change in the sintering schedule to two-step sintering on grain size growth with the purpose of reducing it
The determined crystallite size increased from 168 nm to 245 nm
Summary
During sintering of compacted nanopowders, shrinkage measurements indicate intensive sintering kinetic. The origins of the peculiarities related with size phenomenon can be attributed to intensive rearranging processes of nanopowder particles at the onset, while at the final stage simultaneous grain impingement occurs due to numerous crystallization centers [2,3]. In this particular binary oxide combination of ZnTiO3, the metastability of the main phase leads to the formation of spinel Zn2TiO4 and distortion of crystallites. The purpose of this work was observation of the influence of a two-step sintering schedule on ZnTiO3 sintering, in view of crystallite size as well as grain size reduction and eventually phase composition favoring the metastable phase
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