�ber die Struktur der isomorphen Verbindungen (NH4)3ZrF7 und (NH4)3HfF7

Hassel, O.; Mark, H.

doi:10.1007/bf01328017

Cited by 32 publications

(4 citation statements)

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“…I n order for the ZrF, + F configuration to give the experimental value, using the above analysis, it would be necessary for the Zr-F distance to be 1.95 1. 0.04 A, instead of the suggest'ed value of 2.1 A [2]. Since 2.1 A is the smallest expected Zr-F distance, the above analysis does not result in agreement with experiment for the ZrF, + F configuration.…”

Section: Inax Ma1mentioning

confidence: 56%

“…It was observed that the dipolar fields at both nuclei were being modulated by thermally activated reorientations of the ammonium ion and the ZrF, or ZrF, ions. The very strong F19-H1 interionic contribution to the local field at the F 1 9 sites prevented a determination of the actual Zr-F configuration, which could be either ZrF, or ZrF, + F in this salt [2]. The reported experiment was performed to help elucidate the Zr-F configuration by studying F19 transients in the isomorphic K,ZrF, in which the ammonium ions are replaced by virtually nonmagnetic K ions.…”

mentioning

confidence: 99%

“…Although the experiment is not conclusive, the following discussion is possible : Considering the dynamic randomness of reorientation predicted by Hampson and Pauling [2], the maximum dipolar F19 intra-group spin-lattice relaxation rate was calculated for both ZrF, and ZrF, groups and the results were compared with experiment.…”

mentioning

confidence: 99%

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F¹⁹ Spin‐Lattice Relaxation in Solid K₃ZrF₇

Sharp

Lahajnar

Pintar

1970

Physica Status Solidi (b)

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Section: Inax Ma1mentioning

confidence: 56%

mentioning

confidence: 99%

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F¹⁹ Spin‐Lattice Relaxation in Solid K₃ZrF₇

Sharp

Lahajnar

Pintar

1970

Physica Status Solidi (b)

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“…In the pioneer work [1] on ammonium heptafluozirconate (NH4)sZrF7 (from now on referred to as AHZ), a structure with (ZrF6)--and F-ions has been put forward as a possibility. Later it was suggested by Hampson and Pauling [2] that (ZrF7)---complexes are present in the AHZ lattice.…”

Section: Introductionmentioning

confidence: 99%

Fluorine and proton spin absorption and relaxation in solid ammonium heptafluozirconate

1967

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H 1 magnetic resonance absorption in (NH4)aZrF7 has been studied over the temperature range 20 ~ to -196~A line width transition due to low activation energy reorientations of two types of NH4 + ion was observed. The fluorine absorption data give also evidence of reorientation of zirconiumfluorine complex. The transient experiment carried out at 15-3 and 22.9 Mc/sec in the same temperature interval supports the absorption results by indicating conclusively that two motions are effective in the crystal studied. The slower one is the zirconium-fluorine ion reorientation, the faster one, the reorientation of the weakly hydrogen-bonded NH4 + ions. The relaxation data exhibit strong F-H and H-F cross relaxations: at higher temperatures fluorines and protons relax essentially through the slower motion of the zirconium-fluorine complex, while at lower temperatures both spins relax through the high frequency reorientation of the NHC ions. The observed dynamic disorder is compatible with the Hampson-Pauling interpretation of the (NHa)aZrF7 structure and thus supports implicitly the existence of the (ZrFT)---complex.

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