The crystal structure of triammonium hydrogen disulphate, (NH4)3H(SO4)2
15 Mar 1978-Acta Crystallographica Section B Structural Crystallography and Crystal Chemistry (International Union of Crystallography)-Vol. 34, Iss: 3, pp 732-735
About: This article is published in Acta Crystallographica Section B Structural Crystallography and Crystal Chemistry.The article was published on 1978-03-15. It has received 89 citations till now. The article focuses on the topics: Crystal structure & Hydrogen.
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TL;DR: In this paper, the dielectric constants of pseudo-hexagonal c-plates of K 3 H(SO 4 ) 2, Rb 3 H (SO 4 ), and their deuterated analogues were measured under room temperature.
Abstract: Dielectric constants were measured for the pseudo-hexagonal c -plates of K 3 H(SO 4 ) 2 , Rb 3 H(SO 4 ) 2 , and their deuterated analogues below room temperature. The dielectric constants of K 3 H(SO 4 ) 2 and Rb 3 H(SO 4 ) 2 monotonically increase with decreasing temperature down to 4.2 K showing no anomalies correspoinding to phase transitions. On the other hand, the dielectric constants of K 3 D(SO 4 ) 2 and Rb 3 D(SO 4 ) 2 show λ-type anomalies at 84 K and 71 K, respectively. The results indicate that the deuteration in these compounds promotes phase transitions in low temperature region.
109 citations
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TL;DR: The frequency dependence of the AC conductivity of (NH4)3H(SO4)1.42(SeO4)0.58 (NHSSe) has been presented and it is reveled that the hopping model is the rate determining mechanism.
106 citations
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TL;DR: In this article, the structure analysis of K 3 H(SO 4 ) 2 was performed by X-ray diffraction experiments in order to study the hydrogen bond character in connection with the geometrical isotope effect.
Abstract: Structure analysis of K 3 H(SO 4 ) 2 was performed by X-ray diffraction experiments in order to study the hydrogen bond character in connection with the geometrical isotope effect. Crystal data at room temperature were obtained as a=9.777(1)A, b=5.674(1)A, c=14.667(4)A, β=102.97(2)° and the space group A 2/ a , Z =4. The hydrogen bond length R OO determined from the positional parameters was 2.493(1)A which was close to but still longer than the so called critical bond length r c . The electron density of split hydrogen atoms was observed on a differential Fourier map. It is concluded that the hydrogen atoms take the disordered state at room temperature and the distance between hydrogen atoms R HH is approximately 0.65 A. The possibilities for the existence both of the low temperature phase and the high temperature prototype phase are discussed.
78 citations
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TL;DR: In this article, the Curie-Weiss constant and spontaneous polarization of the deuterated crystal are 3.7×10 3 K and 2.4 µC·cm -2 at -170^° C, respectively.
Abstract: Dielectric and dilatometric measurements were made for the deuterated crystal (ND 4 ) 3 D(SeO 4 ) 2 . For comparison the dilatometric measurement was also made for the undeuterated crystal (NH 4 ) 3 (SeO 4 ) 2 . Two phase transitions were found at +55^° C and at about +29^° C for (NH 4 ) 3 H(SeO 4 ) 2 besides the two phase transitions previously reported. Deuteration rises the Curie temperature by about 34°C, showing important role of the O–H–O bonds playing in the ferroelectric transition. The Curie-Weiss constant and spontaneous polarization of the deuterated crystal are 3.7×10 3 K and 2.4 µC·cm -2 at -170^° C , respectively.
44 citations
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TL;DR: In this article, the dielectric constants along the c'axis of Cs 3 H(SeO 4 ) 2 and its deuterated crystal were measured in a temperature range from 5 K to 460 K.
Abstract: The dielectric constants along the c ' axis of Cs 3 H(SeO 4 ) 2 and its deuterated crystal were measured in a temperature range from 5 K to 460 K. It was found that Cs 3 H(SeO 4 ) 2 undergoes three phase transitions at 451 K, 364 K and 50 K. The dielectric constant of Cs 3 H(SeO 4 ) 2 shows a small peak at 50 K, and it obeys the Curie-Weiss law above 50 K. The transition temperature (50 K) is increased to 168 K by deuteration, showing a large isotope effect, while other two transition temperatures do not change appreciably.
44 citations
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