Suppression of abnormal grain growth in K_0.5Na_0.5NbO₃: phase transitions and compatibility.

ABSTRACT: This work presents the suppression of abnormal grain growth in bulk ceramic K_0.5Na_0.5NbO₃ (KNN). The suppression is enabled by precise control of the starting powder morphology through match of milling and calcination duration. A comparative temperature-dependent analysis of the resulting sample morphology, phase transitions and related electronic material properties reveals that abnormal grain growth is indeed a major influence in material property deterioration, as has theoretically been suggested in other works. However, it is shown that this abnormal grain growth originates from the calcined powder and not from sintering and that all subsequent steps mirror the initial powder morphology. In specific, the results are discussed with respect to the predict

SUBMITTER: Pop-Ghe P 

PROVIDER: S-EPMC6930306 | biostudies-literature | 2019 Dec

REPOSITORIES: biostudies-literature