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- W2145215168 abstract "Phase transformations in ZrO2 and HfO2 have been investigated in the pressure range between 80 and 300 kbar at about 1000°C in a diamond-anvil press coupled with laser heating. ZrO2 and HfO2 have been found to transform to a cotunnite-type structure at pressures greater than 100 and 150 kbar, respectively, and are the first oxides known to adopt this structure. The new polymorphs have the following cell dimensions (Å units) at room temperature and atmospheric pressure:ZrO2:a = 3.328 ± 0.002 HfO2:a = 3.311 ± 0.002b = 5.565 ± 0.004 b = 5.550 ± 0.004c = 6.503 ± 0.005 c = 6.461 ± 0.005.At 1000°C or below, it is suggested that the sequence of high-pressure polymorphism in both ZrO2 and HfO2 is baddeleyite → tetragonal → cotunnite with increasing pressure. The polyhedral co-ordination in these polymorphs varies from 7, 8 to 9." @default.
- W2145215168 created "2016-06-24" @default.
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- W2145215168 date "1980-01-01" @default.
- W2145215168 modified "2023-10-05" @default.
- W2145215168 title "New high pressure phases of ZrO2 and HfO2" @default.
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- W2145215168 doi "https://doi.org/10.1016/0022-3697(80)90205-x" @default.
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