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Effect of Deuteration on the Thermodynamic Properties of Dioxotetrafluoromolybdate(VI), (NH 4 ) 2 MoO 2 F 4
Thermal and dielectric studies of (ND ) MoO F crystals undergoing successive phase transitions at T = 272 K and T = 181 K showed that deuteration is accompanied by an increase in the chemical pressure in the crystal lattice (Δp ≈ 0.02 GPa), which shifts the Cmcm ↔ Pnma transformation for the first o...
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| Published in: | Inorganic chemistry 2017-06, Vol.56 (11), p.6706-6711 |
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| Main Authors: | , , , |
| Format: | Article |
| Language: | English |
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| cites | cdi_FETCH-LOGICAL-c1218-7b3a09f0deff9e4ba923d7980d6ffebf3ba121706f7e90c97de9e274389ecca03 |
| container_end_page | 6711 |
| container_issue | 11 |
| container_start_page | 6706 |
| container_title | Inorganic chemistry |
| container_volume | 56 |
| creator | Bogdanov, Evgeniy V Pogoreltsev, Evgeniy I Gorev, Mikhail V Flerov, Igor N |
| description | Thermal and dielectric studies of (ND
)
MoO
F
crystals undergoing successive phase transitions at T
= 272 K and T
= 181 K showed that deuteration is accompanied by an increase in the chemical pressure in the crystal lattice (Δp ≈ 0.02 GPa), which shifts the Cmcm ↔ Pnma transformation for the first order to the tricritical point. The direct participation of ammonium groups in the mechanism of structural distortions is demonstrated by a decrease in the entropy of the high-temperature phase transition (ΔS
= R ln 6.0). An external hydrostatic pressure leads to an expansion of the temperature interval of the intermediate antiferroelectric Pnma phase. The triple point on the T-p phase diagram, where the Cmcm, Pnma, amd Pnma* phases coexist, can be realized at a negative pressure of p
≈ -0.8 GPa. |
| doi_str_mv | 10.1021/acs.inorgchem.7b00811 |
| format | article |
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crystals undergoing successive phase transitions at T
= 272 K and T
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= R ln 6.0). An external hydrostatic pressure leads to an expansion of the temperature interval of the intermediate antiferroelectric Pnma phase. The triple point on the T-p phase diagram, where the Cmcm, Pnma, amd Pnma* phases coexist, can be realized at a negative pressure of p
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)
MoO
F
crystals undergoing successive phase transitions at T
= 272 K and T
= 181 K showed that deuteration is accompanied by an increase in the chemical pressure in the crystal lattice (Δp ≈ 0.02 GPa), which shifts the Cmcm ↔ Pnma transformation for the first order to the tricritical point. The direct participation of ammonium groups in the mechanism of structural distortions is demonstrated by a decrease in the entropy of the high-temperature phase transition (ΔS
= R ln 6.0). An external hydrostatic pressure leads to an expansion of the temperature interval of the intermediate antiferroelectric Pnma phase. The triple point on the T-p phase diagram, where the Cmcm, Pnma, amd Pnma* phases coexist, can be realized at a negative pressure of p
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)
MoO
F
crystals undergoing successive phase transitions at T
= 272 K and T
= 181 K showed that deuteration is accompanied by an increase in the chemical pressure in the crystal lattice (Δp ≈ 0.02 GPa), which shifts the Cmcm ↔ Pnma transformation for the first order to the tricritical point. The direct participation of ammonium groups in the mechanism of structural distortions is demonstrated by a decrease in the entropy of the high-temperature phase transition (ΔS
= R ln 6.0). An external hydrostatic pressure leads to an expansion of the temperature interval of the intermediate antiferroelectric Pnma phase. The triple point on the T-p phase diagram, where the Cmcm, Pnma, amd Pnma* phases coexist, can be realized at a negative pressure of p
≈ -0.8 GPa.</abstract><cop>United States</cop><pmid>28492318</pmid><doi>10.1021/acs.inorgchem.7b00811</doi><tpages>6</tpages><orcidid>https://orcid.org/0000-0002-8583-0294</orcidid></addata></record> |
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| source | American Chemical Society:Jisc Collections:American Chemical Society Read & Publish Agreement 2022-2024 (Reading list) |
| title | Effect of Deuteration on the Thermodynamic Properties of Dioxotetrafluoromolybdate(VI), (NH 4 ) 2 MoO 2 F 4 |
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