A precision neutron diffraction study of tetragonal RbH₂PO₄

The role of crystal-structure determination in the study of structural phase transitions

“…omitted.] The parameters given are: a the lattice dimension of the tetragonal Iz2d cell; Tc, the transition temperature; 6, the separation of the disordered proton 1 The temperature and p r e s s u r e de endence of some s t r u c t u r a l parameters i n p a r a e l e c t r i c ( t e t r a g o n a l ) RbDP"", KDP'"12,and DKDP(x=0.94 (1) (K) 29 5 Tc+5 295 Tc+5 295 363 Tc+5 a (8) 7.607(1) 7.586 (3) (1) 00 58.81 (2) 59.08 (5) 60.89 (1) 60.99 (1) 61.69 (9) the d i f f e r e n c e i n Tc between RbDP and KDP i s only .. 20K. s t r o n g l y dependent on 6 alone.…”

1H17O nuclear quadrupole double resonance in phenylphosphinic acid and phenylphosphonic acid. 17O quadrupole coupling in P = O and POH bonds

“…In hydrogen-bonded solids, the P-O bond length can be further related to the hydrogen bond length and to the hydrogen position and disorder within the hydrogen bond. In addition to the structural data for phenylphosphinic and phenylphosphonic acid, [1 -3] we used the data for KH 2 PO 4 , [17] PbHPO 4 , [18] CsH 2 PO 4 , [19,20] RbH 2 PO 4 , [21] TlH 2 PO 4 , [22,23] triphenyl phosphate, [24,25] and triphenylphosphine oxide. [26] The correlation between eQV YY /h and the P-O bond length is shown in Fig.…”

Synthesis and Structure Determination of Rb2(HSO4)(H2PO4) and Rb4(HSO4)3(H2PO4) by X-Ray Single Crystal and Neutron Powder Diffraction

“…In comparison, the rubidium atoms in RbHSO are coordinated by nine and ten oxygen atoms, respectively, with Rb}O distances 2.90}3.30 A > (13). In contrast, Rb is coordinated by eight oxygen atoms with bond lengths between 2.933 and 3.026 A > in RbH PO (14). The mean S/P}O bond lengths in the tetrahedra in Rb (HSO )(H PO ) amount to 1.505 A > .…”