Anomalous compressive behavior in CeO<sub>2</sub>nanocubes under high pressure

Meng, Ge; Fang, Yunzhang; Wang, H.; Chen, Weiwang; He, Yi; Liu, E. Z.; Su, Na; Ståhl, Kenny; Feng, Yuanping; Tse, John S.; Kikegawa, Takumi; Nakano, Satoshi; Zhang, Zaoli; Kaiser, Ute; Wu, Fengmin; Mao, Ho‐kwang; Jiang, J.Z.

doi:10.1088/1367-2630/10/12/123016

Cited by 19 publications

(19 citation statements)

References 42 publications

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“…For the nanosized sample, we found that the bulk modulus of the cubic phase B 0 ¼ 296. 29 There were several articles reporting that nanosized samples had higher bulk modulus including Ga 2 O 3 , 21 Al 2 O 3 , 30 and SnO 2 . However, there were no literatures reporting high-pressure phase transition of nanosized In 2 O 3 , and for both the samples investigated in this work, under the same pressure, the volume value was smaller compared with results reported in the previous bulk samples research.…”

Section: Resultsmentioning

confidence: 99%

Compression behavior and phase transition of cubic In2O3 nanocrystals

Liu

et al. 2011

Journal of Applied Physics

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High-pressure behaviors of bixbyite-type cubic In2O3 nanocrystals with an average grain size of 6.0 nm and bulk In2O3 samples were investigated by in situ high-pressure synchrotron radiation x-ray diffraction measurements up to 40 GPa at ambient temperature. It was found that nanosized and bulk samples began to transform from cubic into hexagonal structure at about 15–25 GPa and extended up to 40 GPa. Both cubic and hexagonal phases remained after pressure release. Below the onset transition pressure, the nanosized samples were harder to compress with a larger bulk modulus of 296.06 GPa than the bulk samples with a bulk modulus of 178.87 GPa.

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Section: Resultsmentioning

confidence: 99%

Compression behavior and phase transition of cubic In2O3 nanocrystals

Liu

et al. 2011

Journal of Applied Physics

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“…In other words, results suggested that the shorter and stronger Ce-O bonds are near the surface of the nanocrystal forming a hard shell which is harder to compress5. Here we consider the harden shell surface with shorter an stronger Ce-O, which is different from the initially LDA, as high density amorphous (HDA);…”

Section: Discussionmentioning

confidence: 98%

“…It is reported that the phase transformation pressure of nanosized CeO 2 decreased compared to that of bulk counterpart89, whereas other studies hinted that nano-CeO 2 remains stable to much higher pressures than the bulk7101114. Moreover, an anomalous compressive behavior of CeO 2 nanocubes, which is due to the strengthening of the surface Ce-O bonds, was observed by Ge et al 5. Therefore, series of interesting phenomena and novel properties have attracted much interest, and continuous high pressure investigations are conducting to reveal the details of the behavior of nano-CeO 2 .…”

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confidence: 94%

“…As an important material in many technological applications including gate for metal-oxide semiconductor devices, ultraviolet (UV) blockers, solar cell, catalysts, and solid oxide fuel cells, the rare earth oxide CeO 2 , with a cubic fluorite structure, is considered to be important in the high P - T processing of advanced engineering materials 1 2 3 4 . Due to its promising technological applications, numerous investigations have been reported on the structure stabilities and compressibility of different sized CeO 2 under high pressure 5 6 7 8 9 10 11 12 13 . It is reported that the phase transformation pressure of nanosized CeO 2 decreased compared to that of bulk counterpart 8 9 , whereas other studies hinted that nano-CeO 2 remains stable to much higher pressures than the bulk 7 10 11 14 .…”

mentioning

confidence: 99%

“…Moreover, an anomalous compressive behavior of CeO 2 nanocubes, which is due to the strengthening of the surface Ce-O bonds, was observed by Ge et al . 5 Therefore, series of interesting phenomena and novel properties have attracted much interest, and continuous high pressure investigations are conducting to reveal the details of the behavior of nano-CeO 2 .…”

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confidence: 99%

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Unusual Compression Behavior of Nanocrystalline CeO2

Wang

Peng

et al. 2014

Sci Rep

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The x-ray diffraction study of 12 nm CeO2 was carried out up to ~40 GPa using an angle dispersive synchrotron-radiation in a diamond-anvil cell with different pressure transmitting medium (PTM) (4:1 methanol: ethanol mixture, silicone oil and none) at room temperature. While the cubic fluorite-type structure CeO2 was retained to the highest pressure, there is progressive broadening and intensity reduction of the reflections with increasing pressure. At pressures above 12 GPa, an unusual change in the compression curve was detected in all experiments. Significantly, apparent negative volume compressibility was observed at P = 18–27 GPa with silicone oil as PTM, however it was not detected in other circumstances. The expansion of the unit cell volume of cubic CeO2 was about 1% at pressures of 15–27 GPa. To explain this abnormal phenomenon, a dual structure model (hard amorphous shell and relatively soft crystalline core) has been proposed.

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