Pressure-induced metallization and structural transition of rhombohedral Se

Kawamura, Haruki; Matsui, N.; Nakahata, I.; Nakano, Kazutaka; Kobayashi, Masakazu; Akahama, Yuichi; Nagata, K.; Miyamoto, Yoshiharu

doi:10.1016/s0038-1098(98)00418-9

Cited by 7 publications

(6 citation statements)

References 7 publications

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“…Rhombohedral Se was reported to undergo pressure-induced metallization at ∼16 GPa, and the interchain Se−Se distance is reduced to ∼3.0 Å. 52 Upon compression to higher pressure, the interlayer Se− Se distances in both CrSe and Cr 2 Se 3 become comparable with that in metallic Se. However, the Cr−Cr distance remains shorter than that in the Cr metal below 30 GPa.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Pressure-Induced Reversible and Irreversible Multistate Switching in NiAs-Type Chromium Selenides

Liu

Jiang

et al. 2023

Chem. Mater.

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Materials capable of switching in multiple states under external stimuli have garnered extensive attention in the field of memory devices and switches. The coupling of various switching properties is of paramount significance to the creation of multifunctional devices. Herein, we report the pressure-induced multiswitching behaviors of both the structural and physical properties in two chromium selenides, CrSe and Cr2Se3. Comprehensive high-pressure characterizations reveal the collaborative occurrence of pressure-induced structural phase transitions, spin-crossover, metallization, and n–p conduction-type switching in both compounds. Upon compression, Cr2Se3 demonstrates an unexpected increase in resistivity and band gap, which is associated with the disordering of the self-intercalation structure. Of particular interest is that due to the dimensional differences in crystal structures, the photoelectric properties of the two decompressed samples are inversely regulated after pressure treatment. Notably, the band gap of Cr2Se3 is pronouncedly broadened after decompression due to the partially irreversible disorder in the structure. These results demonstrate that pressure engineering can regulate the photoelectric properties of materials effectively and flexibly, serving as a potential foundation for fabricating innovative pressure-responsive multifunctional devices.

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Section: ■ Results and Discussionmentioning

confidence: 99%

Pressure-Induced Reversible and Irreversible Multistate Switching in NiAs-Type Chromium Selenides

Liu

Jiang

et al. 2023

Chem. Mater.

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“…Selenium (Se) has several crystalline allotropes; namely trigonal (t-Se or Se-I), rhombohedral (r-Se), orthorhombic (o-Se), and -monoclinic (m-Se) modifications, which consist of 3 1 helical chain, Se 6 , Se 7 , and Se 8 ring molecules, respectively.…”

Section: Introductionmentioning

confidence: 99%

“…[2][3][4][5][6][7][8][9][10] The generally accepted transition sequence in t-Se is Se-I to Se-II (monoclinic form, puckered layer structure) at 14 GPa, Se-II to Se-III (triclinic form) at 23 GPa, Se-III to Se-IV (incommensurate monoclinic form) at 28 GPa, Se-IV to Se-V ( -Po structure) at 80 GPa, and Se-V to Se-VI (bcc) at 140 GPa. [2][3][4][5][6] In comparison with this case of t-Se, the structures of the high pressure phases of r-Se, 7) o-Se, 8) and m-Se 9) have been unclear because of the following two reasons. One is that the high pressure behavior in these allotropes was investigated before the determination of the structures of Se-III, Se-IV, and Se-II' (tetragonal form consisting of 4 1 and 4 3 helical chain molecules) which is one of the high pressure phases of m-Se, 10) and the other is that the high pressure phases at pressure between 10 GPa and 30 GPa are mixture phases and that the diffraction patterns of these phases are complex.…”

Section: Introductionmentioning

confidence: 99%

Pressure-Induced Phase Transitions of Trigonal, Rhombohedral, Orthorhombic, and α-Monoclinic Selenium

Takumi

Nagata

2007

J. Phys. Soc. Jpn.

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Pressure-induced phase transitions of trigonal, rhombohedral, orthorhombic, and -monoclinic selenium (Se), which consist of 3 1 helical chain, Se 6 , Se 7 , and Se 8 ring molecules, respectively, have been re-examined by an X-ray diffraction method. All allotropes transform to Se-IV (incommensurate monoclinic form) at about 30 GPa through a mixture phase of Se-II (monoclinic form, puckered layer structure) and Se-II' (tetragonal form consisting of 4 1 and 4 3 helical chain molecules). The ratio of Se-II to Se-II' in the mixture phase increases with the increase in density of starting material.Trigonal form (Se-I) transforms to Se-I', which is isostructural with Se-I, at 3 GPa, where an intramolecular covalent bond length decreases abruptly by about 0.8 %.KEYWORDS: selenium, allotropes, phase diagram, high pressure, x-ray diffraction IntroductionSelenium (Se) has several crystalline allotropes; namely trigonal (t-Se or Se-I), rhombohedral (r-Se), orthorhombic (o-Se), and -monoclinic (m-Se) modifications, which consist of 3 1 helical chain, Se 6 , Se 7 , and Se 8 ring molecules, respectively.1) The pressure-induced phase transitions of these allotropes have been investigated.2-10) The generally accepted transition sequence in t-Se is Se-I to Se-II (monoclinic form, puckered layer structure) at 14 GPa, Se-II to Se-III (triclinic form) at 23 GPa, Se-III to Se-IV (incommensurate monoclinic form) at 28 GPa, Se-IV to Se-V ( -Po structure) at 80 GPa, and Se-V to Se-VI (bcc) at 140 GPa. [2][3][4][5][6] In comparison with this case of t-Se, the structures of the high pressure phases of r-Se, 7) o-Se, 8) and m-Se 9) have been unclear because of the following two reasons. One is that the high pressure behavior in these allotropes was investigated before the determination of the structures of Se-III, Se-IV, and Se-II' (tetragonal form consisting of 4 1 and 4 3 helical chain molecules) which is one of the high pressure phases of m-Se, 10) and the other is that the high pressure phases at pressure between 10 GPa and 30 GPa are mixture phases and that the diffraction patterns of these phases are complex. In this paper, in order to clarify the phase diagrams of selenium allotropes, we have re-examined the phase transitions of four kinds of selenium allotropes, t-Se, r-Se, o-Se, and m-Se using an X-ray diffraction method.

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“…Generally, there is a constant increase of CN upon changing from low-coordinated semiconductors -sulphur and selenium showing a large variety of allotropes already at ambient pressure -with highly anisotropic (heterodesmic) bonding towards 3D-connected solid state arrangements [88][89][90][91][92][93][94][95][96][97][98][99][100], e.g., that of non-centrosymmetric Te-II (Fig. 13).…”

Section: Chalcogens Halogens and Noble Gasesmentioning

confidence: 99%

Metallic high-pressure modifications of main group elements

Schwarz¹

2004

Zeitschrift Für Kristallographie - Crystalline Materials

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Abstract. The high-pressure structural chemistry of main group elements in the metallic state is reviewed under consideration of more recent determinations of atomic arrangements with to some extend unexpected complexity. Following the concept of the pressure-coordination rule, the number of nearest neighbours is employed as a guiding quantity to reveal systematic trends. Violations of the rule will be mainly discussed in the light of electronic ground state changes upon compression.

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Pressure-induced metallization and structural transition of rhombohedral Se

Cited by 7 publications

References 7 publications

Pressure-Induced Reversible and Irreversible Multistate Switching in NiAs-Type Chromium Selenides

Pressure-Induced Reversible and Irreversible Multistate Switching in NiAs-Type Chromium Selenides

Pressure-Induced Phase Transitions of Trigonal, Rhombohedral, Orthorhombic, and α-Monoclinic Selenium

Metallic high-pressure modifications of main group elements

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