High entropy oxide (HEO) materials display a reversible entropy-driven phase transformation that gives rise to a phase state consisting of the entropic single-phase and controllable volume fractions of a secondary phase, which we call the 'phase spectrum'. Consolidated HEO samples were prepared with grain sizes spanning several orders of magnitude and were heat treated to demonstrate the dramatic effect that grain size has on controlling the phase spectrum behavior. The volume fraction and morphology of the secondary phase, determined here to be a Cu-rich multicomponent tenorite phase, and the corresponding heat treatment conditions were significantly influenced by the grain size. IMPACT STATEMENTNanocrystalline high entropy oxides (HEOs) exhibit a wider phase transformation temperature window, as well as changes to the concentration and morphology of the secondary phase, a Cu-rich multicomponent tenorite phase. ARTICLE HISTORY

Aims:The fate of Escherichia coli O157:H7 was investigated during the manufacture of Mozzarella cheese. Methods and Results: The Mozzarella cheese was made from unpasteurized milk which was inoculated to contain ca 10 5 cfu ml )1 E. coli O157:H7. Two different heating temperatures (70 and 80°C), commonly used during curd stretching, were investigated to determine their effects on the viability of E. coli O157:H7 in Mozzarella cheese. Stretching at 80°C for 5 min resulted in the loss of culturability of E. coli O157:H7 strains, whereas stretching at 70°C reduced the number of culturable E. coli O157:H7 by a factor of 10. Conclusions:The results show that stretching curd at 80°C for 5 min is effective in controlling E. coli O157:H7 during the production of Mozzarella cheese. Brining and storage at 4°C for 12 h was less effective than the stretching. Significance and Impact of the Study: Mozzarella cheese should be free of E. coli O157:H7 only if temperatures higher than or equal to 80°C are used during milk processing.

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A high-performance lead-free electro-optic (EO) transparent material is introduced and used in an EO device operating up to 10 kHz. The BZT-BCT ceramic, named as BXT, has an effective DC EO coefficient, r = 530 pm V , which is higher than state-of-the-art materials such as LiNbO . The high EO response can be leveraged for miniaturization and/or reduction of the operating voltage of EO devices.