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In order to homogenise compositions, bars were ground, pressed and reheated. This procedure was repeated 3 times. The powders obtained with an average particle size of 23 μm were pressed into bars at 200 MPa. The next step involved heating the bars up to 1500 °C for 4 h, followed by cooling to 1120 °C inside the furnace, where gastric pits remained for 16 h before being cooled down to room temperature.