Structure d'hydrogénoorthophosphates de thallium(I). II. Structure du dihydrogénoorthophosphate de thallium(I), TlH<sub>2</sub>PO<sub>4</sub>

Oddon, Y.; Tranquard, A.; Pèpe, G.

doi:10.1107/s0567740879004106

Cited by 31 publications

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“…The crystalline region, identified as monoclinic ( P 2 1 / c, I) by X-ray diffraction, gave a spectrum with a sharp peak in the A 1 region. Since this phase is isomorphous with TlH 2 PO 4 (TlDP), we compared its spectrum with that of a TlDP crystal (Figure ). The two spectra have a strong correspondence.…”

Section: Resultsmentioning

confidence: 99%

“…On cooling to −62 °C, I becomes monoclinic C -centered (VIII). X-ray analysis revealed that II‘ is a “jumbled” version of II, whereas I and VIII are layered phases, differing only in small rotations of the H 2 PO 4 - ions, and isomorphous with a pair of TlH 2 PO 4 phases . From this structural information we have identified and summarized (Table ) the relevant symmetries required for the factor group analysis of the various KDP phases.…”

Section: Introductionmentioning

confidence: 99%

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Reevaluation of Raman Spectra for KH₂PO₄ High-Temperature Phases

et al. 1999

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The common tetragonal form of KH2PO4 undergoes two high-temperature transformations that have been studied extensively by vibrational spectroscopy. But, because these changes are strikingly heterogeneous, the previously reported spectra, averages over polycrystalline and single crystal domains, have remained ill-defined. We recently identified the crystalline domains by polarization microscopy, physically isolated them, and determined their structures by X-ray diffraction (Subramony, J. A.; Lovell, S.; Kahr, B. Chem. Mater. 1998, 10, 2053−2057). Here, using micro-Raman spectroscopy, we have deconvoluted the signals of the polycrystalline and crystalline domains, showing that the inescapable pyro- and metaphosphate dehydration products are localized in the polycrystalline material. Those debating whether the transformations are genuine structural phase transformations or are merely dehydration reactions can all be vindicated in certain parts of any one sample.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Reevaluation of Raman Spectra for KH₂PO₄ High-Temperature Phases

et al. 1999

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“…transforms into monoclinic phase I, space group P2 1 /c, isostructural with TlH 2 PO 4 . 14 When cooled down to 211 K, phase I converts to phase VIII of monoclinic space group Cc. 15 Several other phases were also obtained depending on the crystallization method.…”

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confidence: 99%

Structure of the high-pressure phase IV of KH₂PO₄(KDP)

Cai

Katrusiak

2013

Dalton Trans.

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“…The room temperature tetragonal structure (II, I 42d) becomes triclinic (II 0 , P 1) at w468 K, and monoclinic primitive (I, P2 1 /c) at w503 K. On cooling to 211 K, I becomes monoclinic C-centered (VIII, Cc). X-ray analysis revealed that II 0 is a slightly distorted version of II, whereas I and VIII are layered phases, differing only in small rotations of the H 2 [9,10]. Here, we report the first high temperature phase of DKDP, that is isomorphous to the triclinic (II 0 ) phase of KDP.…”

Section: Introductionmentioning

confidence: 90%