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  • 1
    Electronic Resource
    Electronic Resource
    A new modification of diammonium hexafluorosilicate, (NH4)2SiF6 (2001)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 57 (2001), S. i90-i91 
    Details
    ISSN: 1600-5368
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: A hexagonal modification (P63mc) of (NH4)2SiF6 was grown accidentally. This new modification has the unit-cell c parameter doubled with respect to a previously reported trigonal form (P\overline 3m1) of the title compound. The H atoms in the present structure are ordered. Three or even four F atoms are hydrogen-bond acceptors for each H atom. The structure is isostructural with modifications of (NH4)2MnF6, K2GeF6 and Rb2GeF6.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S160053680101501X
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  • 2
    Electronic Resource
    Electronic Resource
    Ferroelastic n-pentylammonium dihydrogenarsenate (2001)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 57 (2001), S. o349-o352 
    Details
    ISSN: 1600-5368
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: n-Pentylammonium dihydrogenarsenate, C5H14N+·H2AsO4− (C5ADA), is ferroelastic at room temperature. The structure is monoclinic (P21/n) and isostructural with n-pentylammonium dihydrogenphosphate (C5ADP). In contrast to C7ADA and C9ADA, as well as to C7ADP and C9ADP, two independent dihydrogenarsenates in the present structure are not disordered. Similarly, as in other known members of the series (C2ADP–C10ADP and C6ADA–C9ADA), there are strong hydrogen bonds between the anions, and moderate hydrogen bonds between the anions and the cations. The hydrogen-bond distances correspond well to those observed in the dihydrogenphosphates. There are two H atoms in the structure which are involved in asymmetric hydrogen bonds between respective oxygen pairs. These H atoms jump from the donor to the acceptor O atoms during ferroelastic switching. A phase transition was observed at about 380 and 371 K during heating and cooling, respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S160053680100472X
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  • 3
    Electronic Resource
    Electronic Resource
    2,4-Dimethylanilinium dihydrogenphosphate (2001)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 57 (2001), S. o1058-o1060 
    Details
    ISSN: 1600-5368
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: 2,4–Dimethylanilinium dihydrogenphosphate, C8H12N+.H2PO4−, (I), is monoclinic (P21/c). The ions are held together by O—H...O and N—H...O hydrogen bonds. In addition there is one Cmethyl—H...O hydrogen bond. The dihydrogenphosphates and the —NH3 groups are arranged in sheets which are parallel to the (010) plane. In each sheet there are centrosymmetric pairs of dihydrogenphosphates held by O—H...O bonds. These pairs of dihydrogenphosphates are arranged in columns that are parallel to the unit-cell b axis. These columns are held together via —NH3 groups through N—H...O bonds. Each hydrogen from an —NH3 group is donated to a different dihydrogenphosphate ion. The differential scanning calorimetry experiment showed anomaly during heating at ∼442 K.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S1600536801016191
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  • 4
    Electronic Resource
    Electronic Resource
    Ferroelastic n-butylammonium dihydrogenphosphate (2000)
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 56 (2000), S. e263-e264 
    Details
    ISSN: 1600-5759
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: Crystals of n-butylammonium dihydrogenphosphate, C4H9NH3+·H2PO4−, reveal ferroelasticity at room temperature and a number of phase transitions when heated up to approximately 373 K. Some of these phase transitions show hysteresis effects. All atoms except two H atoms exist in pairs linked by the lost symmetry operations derived from the prototypic space group P2/b21/n21/a. Each of these two different H atoms is involved in an asymmetric hydrogen bond between an oxygen pair. Ferroelastic switching is concomitant with jumps of these hydrogen species from donor to acceptor O atoms. The studied structure belongs to the structural family of n-hexyl- to n-decylammonium dihydrogenphosphates and differs by localization of alternating layers from n-propyl- and n-pentylammonium dihydrogenphosphates. The studied crystal was slightly twinned; the minor domain constituted approximately 2%.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108270100006326
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  • 5
    Electronic Resource
    Electronic Resource
    Silver niobium trioxide, AgNbO3 (2000)
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 56 (2000), S. 916-918 
    Details
    ISSN: 1600-5759
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: The present structure determination of silver niobium trioxide at 291 K was performed on a twinned single crystal with a predominant presence [about 93 (1)%] of one twin domain. The sample contained traces of V (about 1 atomic %). This study confirms that the room-temperature phase of AgNbO3 is isostructural with the room-temperature phase of NaNbO3, i.e. it is a tilted perovskite. Structural deviation in AgNbO3 from centrosymmetry was not detected in this study and its structure was refined in Pbcm, though a previous study indicated ferroelectricity below 350 K, in contrast with NaNbO3.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108270100006806
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  • 6
    Electronic Resource
    Electronic Resource
    Ferroelastic structures of n-pentyl-, n- hexyl- and n-nonylammonium dihydrogenphosphate crystals (2000)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 56 (2000), S. 906-914 
    Details
    ISSN: 1600-5740
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: This study reports the structure redeterminations of C5H11NH3+·H2PO4− (n-pentylammonium dihydrogenphosphate, C5ADP), C6H13NH3+·H2PO4− (n-hexylammonium dihydrogenphosphate, C6ADP) and C9H19NH3+·H2PO4− (n-nonylammonium dihydrogenphosphate, C9ADP). The structures are monoclinic (P21/n), belonging to the series of previously studied structures C2ADP–C8ADP and C10ADP. The structures exhibit reproducible ferroelastic switching. There are hydrogen bonds between the dihydrogenphosphates and the n-alkylammonium groups. Among them there are two hydrogen bonds with hydrogens which hop from the donor to the acceptor oxygens during the ferroelastic switching. C5ADP as well as C3ADP differ from the other members of the series by packing of the double layers of the dihydrogenphosphates. Moreover, the packing of n-alkylammonium molecules in all these structures depends on the parity of the number of atoms in the n-alkylammonium chains. All the samples contained two domains and their structures were refined as twins.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108768100007941
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  • 7
    Electronic Resource
    Electronic Resource
    Ferroelastic n-propylammonium dihydrogenphosphate (2000)
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 56 (2000), S. e359-e360 
    Details
    ISSN: 1600-5759
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: n-Propylammonium dihydrogenphosphate, C3H7NH3+·H2PO4−, crystals are ferroelastic at room temperature. The phase transition into the prototypic phase takes place at approximately 378 K. All atoms except two H atoms are linked by the lost symmetry operations derived from the prototypic space group P2/b21/n21/a. Each of these two different H atoms is involved in an asymmetric hydrogen bond between an oxygen pair. Ferroelastic switching is concomitant with jumps of these H atoms from the donor to the acceptor O atoms. The compound belongs to the structural family of n-alkylammonium dihydrogenphosphate and in particular to the structure type of pentylammonium dihydrogenphosphate, which differs by localization of alternating layers from the rest of the known alkylammonium dihydrogenphosphates. The crystal was slightly twinned; the proportion of the minor domain was approximately 3.5%.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108270100009598
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  • 8
    Electronic Resource
    Electronic Resource
    Phase transitions in n-alkylammonium dihydrogenphosphates and -arsenates and ferroelastic n-hexyl- and n-octylammonium dihydrogenarsenate (2001)
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 57 (2001), S. 22-25 
    Details
    ISSN: 1600-5759
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: n-Hexylammonium dihydrogenarsenate, (C6H16N)[AsO2(OH)2], and n-octylammonium dihydrogenarsenate, (C8H20N)[AsO2(OH)2], are both ferroelastic at room temperature. The samples used in this study were not subjected to a phase transition after they had been crystallized. The structures are monoclinic (P21/n) and isostructural with the corresponding dihydrogenphosphates. Each sample contained two domains and each structure was refined as a twin. There are strong hydrogen bonds between dihydrogenarsenates and moderate hydrogen bonds between dihydrogenarsenates and n-alkylammonium groups. The hydrogen-bond distances correspond well to those observed in the dihydrogenphosphates. All the atoms except two H atoms exist in pairs linked by the lost symmetry operations derived from the prototypic space group P2/b21/n21/a. Each of these two different H atoms is involved in an asymmetric hydrogen bond between an oxygen pair. These oxygens are supposed to change their roles as hydrogen-bond donors and acceptors during the ferroelastic switching. The phase-transition sequences are affected by interactions between the neighbouring organic chains in the structure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108270100013834
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  • 9
    Electronic Resource
    Electronic Resource
    Ferroelastic n-heptylammonium dihydrogenarsenate (2001)
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 57 (2001), S. 403-405 
    Details
    ISSN: 1600-5759
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: n-Heptylammonium dihydrogenarsenate, (C7H18N)[As(O)2(OH)2] (C7ADA), is ferroelastic at room temperature and isostructural with n-heptylammonium dihydrogenphosphate (C7ADP). In contrast to the other known n-alkylammonium dihydrogenphosphates (CnADP) and dihydrogenarsenates (CnADA), two independent anions in the present structure are substantially disordered (∼88 and ∼12%, respectively). There are strong hydrogen bonds between the dihydrogenarsenates themselves, and moderate hydrogen bonds between the dihydrogenarsenates and the n-alkylammonium groups. The hydrogen-bond distances correspond well to those observed in the dihydrogenphosphates. There are two H atoms in the structure which are involved in asymmetric hydrogen bonds between respective oxygen pairs. These H atoms jump from the donor to the acceptor O atoms during ferroelastic switching.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108270100020850
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  • 10
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    Preparation and the crystal structure of a new manganate, Sr4Mn3O10 (1988)
    Elsevier
    Details
    Publication Date: 1988-04-01
    Print ISSN: 0022-4596
    Electronic ISSN: 1095-726X
    Topics: Chemistry and Pharmacology
    Published by Elsevier
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