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000643487 1001_ $$0P:(DE-HGF)0$$aBayarjargal, Lkhamsuren$$b0$$eCorresponding author
000643487 245__ $$aSynthesis and Characterization of Ti $^{4+}$ Containing Carbonates Ti[CO$_4$] and Ti$_2$ O$_3$ [CO $_3$]
000643487 260__ $$aWashington, DC$$bAmerican Chemical Society$$c2025
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000643487 520__ $$aTwo titanium carbonates, Ti[CO$_4$] and Ti$_2$O$_3$[CO$_3$], were synthesized by the reaction of TiO$_2$ with CO$_2$ at high pressures and temperatures in a laser heated diamond anvil cell. Their structures were solved by in situ single crystal X-ray diffraction at high pressures. At pressures above ≈33 GPa, Ti[CO$_4$]-I4̅2d is stable. It transforms to Ti[CO$_4$]-I4$_1$/amd on pressure release. The distinguishing feature of the Ti[CO$_4$]-structures is the presence of isolated [CO$_4$]$^{4-}$-groups, while Ti$_2$O$_3$[CO$_3$] has isolated [CO$_3$]$_2$–-groups. Both structures contain 8-fold coordinated tetravalent Ti$^{4+}$-cations. Full geometry optimizations based on DFT calculations reproduced the crystal structures. The DFT models were used to complement the experimental compression data and for the assignment of Raman modes. While carbonates are typically compressible compounds, Ti[CO$_4$] is rather incompressible with a bulk modulus of K0 ≈ 200 GPa. As we observed the pressure-induced transformation of TiO$_2$, we provide the Raman spectra of TiO$_2$–OI, and TiO$_2$–OII.
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000643487 536__ $$0G:(GEPRIS)264049573$$aDFG project G:(GEPRIS)264049573 - Carbonate und Schock-Kompression: Stabilität, Phasentransformation und chemische Reaktionen mit Silikaten (264049573)$$c264049573$$x2
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000643487 7001_ $$0P:(DE-H253)PIP1032506$$aSpahr, Dominik$$b1
000643487 7001_ $$00000-0003-2258-1347$$aMilman, Victor$$b2
000643487 7001_ $$0P:(DE-H253)PIP1091076$$aGiordano, Nico$$b3
000643487 7001_ $$0P:(DE-H253)PIP1019654$$aGlazyrin, Konstantin$$b4
000643487 7001_ $$0P:(DE-H253)PIP1011391$$aWinkler, Bjoern$$b5
000643487 773__ $$0PERI:(DE-600)1484438-2$$a10.1021/acs.inorgchem.5c03033$$gVol. 64, no. 44, p. 21893 - 21902$$n44$$p21893 - 21902$$tInorganic chemistry$$v64$$x0020-1669$$y2025
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