References
- Arend , H. , Muralt , P. , Plesko , S. and Altermatt , D. 1980 . Halide ferroelectrics . Ferroelectrics , 24 : 297
- Asker , W. J. , Scaife , D. E. and Watts , J. A. 1972 . Halogen nuclear quadrupole resonance and structural relationships in some complex halides of zinc and copper . Austr. J. Chem. , 25 : 2301
- Bloembergen , N. , Purcell , E. M. and Pound , R. V. 1948 . Relaxation effects in nuclear magnetic resonance absorption . Phys. Rev. , 73 : 679
- Gutowsky , H. S. , Pake , G. E. and Bersohn , R. 1954 . Structural investigations by means of nuclear magnetism III. Ammonium halides. . J. Chem. Phys. , 22 ( 4 ) : 643
- Guttler , W. and Von Schutz , J. U. 1973 . Proton spin-lattice relaxation and exchange splitting of the torsional ground state in NH4ClO4 . Chem. Phys. Lett. , 20 : 133
- Ikeda , R. and McDowell , C. A. 1972 . Spin-rotational relaxation for protons in NH4ClO4 . Chem. Phys. Lett. , 14 : 389
- Koksal , F. 1979 . Investigations of the proton spin-lattice relaxation times of some ammonium compounds . Z. Naturforsch. , 349 : 239
- Koksal , F. and Bahceli , S. 1978 . Spin-lattice relaxation of protons in some polycrystalline ammonium compounds . Chem. Soc. Faraday Trans. II , 74 : 1844
- Madhusudan Rao , P. and Reddy , K. V. 1984 . Photoluminescence study of ammonium tetrabromozincate. . Phys. Status Solidi (a). , 83 : K145
- Madhusudan Rao , P. and Reddy , K. V. 1989 . EPR and pulsed NMR study of (NH4)2ZnBr4:Mn!2+. . Cryst. Res. Technol. , 24 ( 9 ) : 893
- Moorthy , A. G. K. , Chandrashekar , P. and Bhatnagar , A. K. 1984 . Light scattering from (NH4)2ZnBr4 in the incommensurate phase. . Current Sci. , 53 ( 22 ) : 1197
- Moorthy , A. G. K. , Chandrashekar , P. and Bhatnagar , A. K. 1984 . Raman scattering investigation of the phase transitions in (NH4)2ZnBr4 . Ferroelectric Letters , 3 : 9
- Moskalev , A. K. , Belbrova , I. A. , Zherebtsova , L. I. and Alexandrova , A. P. 1982 . Ferroelectric phase transition in (NH4)2ZnBr4. . Phys. Status. Solidi(a) , 72 : K19
- Osaka , T. , Kamukae , M. and Makita , Y. 1982 . Ferroelectricity and successive phase transitions in (NH4)2ZnBr4. . J. Phys. Soc. Japan. , 51(11) : 3409
- Sato , T. , Osaka , T. and Makita , Y. 1983 . X-ray diffraction study on a new incommensurate phase transition in ferroelectric (NH4)2ZnBr4. . J. Phys. Soc. Japan , 52(10 : 3297
- Sundaram , C. S. , Ramakrishna , J. , Chandrashekar , K. and Sastry , V. S. S. 1986 . Study of internal motions and phase transitions in (NH4)2ZnCl4 and [N(CH3)4]2ZnCl4 by proton magnetic resonance and relaxation . Ferroelectrics , 69 : 299
- Svare , I. 1977 . Proton tunnelling frequencies in ammonium salts from spin-lattice relaxation . J. Phys. C., (SSP) , 10 : 4137
- Tuohi , J. E. , Ylinen , E. E. and Punkkinen , M. 1976 . Low temperature spin-lattice relaxation of protons in solid ammonium hexachloroplumbate . Physica. Scripta. , 13 : 253
- Tuohi , J. E. , Ylinen , E. E. and Niemela , L. K. E. 1974 . NMR study of hindered rotation in solid (ND4)2GeF6 . Chem. Phys. Lett. , 28(1) : 35
- Venu , K. , Sastry , V. S. S. and Ramakrishna , J. 1986 . Proton magnetic resonance study of molecular dynamics in (NH4)2CdI4 . Chem. Phys. , 107 : 123