Refinement of the crystal structure of ferroelectric acid lithium selenite: position of the lithium ion

Rao, Jayasimha; Viswamitra, M. A.

doi:10.1107/s056774087100476x

Cited by 9 publications

(2 citation statements)

References 8 publications

(15 reference statements)

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“…The crystal structure of LiH,(SeO,), has been determined by a number of workers (17)(18)(19). It is a Can.…”

Section: Crystal Structure Lithiunl Trillydrogen Selenitementioning

confidence: 99%

“…The lithium ion (at 0, i, + and symmetry related site 4, $, 0) is surrounded by six oxygen atoms arranged in a nearly perfect octahedron with Li-0 distances between 2.126 to 2.216 A and unequal 0-Li-0 angles ranging from 86.84" to 92.43' (18). Each oxygen atom of the selenite group, besides being covalently linked to a selenium atom, has three near neighbours: a lithium ion, a hydrogen bonded oxygen atom, and a distant selenium atom.…”

Section: Crystal Structure Lithiunl Trillydrogen Selenitementioning

confidence: 99%

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Electron paramagnetic resonance of Mn²⁺ doped in alkali trihydrogen selenite single crystals

Jain¹,

Venkateswarlu²

1978

Can. J. Phys.

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The electron paramagnetic resonance spectra of Mn2+ doped in MeH,(Se0,)2 (Me = Li, Na, K, and Rb) single crystals have been studied at 298 K. In LiH,(Se0,)2, an axis of non-coincidence effect has been observed and Mn2+ spectra show line broadening of outer transitions. In NaH,(Se0,)2, Mn2+ substitutes for Na+ ions and is associated with second nearest neighbour Na+ ion vacancies. Below the ferroelectric phase transition temperature of this crystal every line of the spectrum appears to split into two. The spectra of Mn2+ doped LiH,(Se0,)2 and NaH,(SeO,), (in paraelectric phase) have been analysed using the spin-Hamiltonian for rhombic symmetry. However, in KH,(Se0J2 and RbH,(Se0,)2 the Mn2+ ions give only one line. The linewidths and g values of the lines for KH,(Se0,)2 and RbH,(SeO,), are AH,,, = 154 2 15 G, g = 1.988 2 0.008, and AH,, = 102 2 10 G, g = 1.998 2 0.006, respectively.Les spectres de resonance paramagnetique electronique de Mn2+ dope dans des monocristaux de MeH,(SeO,), (Me = Li, Na, K et Rb) ont ete ttudies a 298 K. Dans LiH,(SeO,),, un axe d'effet de non-coincidence a ett observe, et les spectres de Mn2+ presentent un elargissement des raies pour les transitions exterieures. Dans NaH,(SeO,),, Mn2+ se substitue a des ions Na+ et se trouve associe a des lacunes Na+ en position de deuxiemes voisins. Au-dessous de la temperature de transition a la phase ferroelectrique, pour ce cristal, chacune des raies du spectre parait se dedoubler. Les spectres de LiH3(Se0,)2 et NaH,(SeO,), (dans la phase para-electrique) dopes avec Mn2+ ont ete analyses en utilisant I'hamiltonien de spin pour la symetrie rhombique. Dans KH,(SeO,), et RbH,(SeO,), cependant, lesions Mn2+ ne donnent qu'une seule raie. Les largeurs de ces raies et les valeurs deg pour KH3(Se03)2 et RbH,(SeO,), sont respectivement: AH,, = 154 2 15G,g = 1.988?0.008etAH,,,= 1 0 2 2 1 0 G , g = 1.998t0.006. Can. J. Phys., 56,807 (1978) [Traduit par lejournal]

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“…The crystal structure of LiH,(SeO,), has been determined by a number of workers (17)(18)(19). It is a Can.…”

Section: Crystal Structure Lithiunl Trillydrogen Selenitementioning

confidence: 99%

Section: Crystal Structure Lithiunl Trillydrogen Selenitementioning

confidence: 99%

Electron paramagnetic resonance of Mn²⁺ doped in alkali trihydrogen selenite single crystals

Jain¹,

Venkateswarlu²

1978

Can. J. Phys.

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Electron Paramagnetic Resonance Studies of Cu²⁺ Impurities in Ferroelectric LiH₃(SeO₃)₂

Hefni

Grecu

et al. 1982

Physica Status Solidi (b)

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The electron paramagnetic resonance spectra of Cua+ doped in Lis(SeO,), single crystals are studied. The ions reside in different chemically distinct sites. For two of them, the strongest in the EPR spectra, the g and A matrices and the & tensor are determined. Within the limit of experimental errors, the EPR spectra of one site exhibits a n orthorhombic symmetry with a pronounced axial character, while the other site exhibits a monoclinic symmetry. In the last case low symmetry effects such as asymmetries of g and A matrices are evidenced.On a Btudie le spectre de R E P du Cu2+ dans des monocristaux du Li%(SeO,)?. Lee ions-impmet6 sont places en differentes positions chimiquement distinctes. Pour deux des positions, celles qui fournissent les spectres des R E P Ies plus intenses, on a dkterminb les matrices g et A et le tenseur &. Dsns les limites des erreurs expbrimentales, le spectre de RPE de I'un des deux centres a une symCtrie orthorhombique S caractere axial marqu6, tandis que I'autre centre offre une sym6trie monoclinique. Dans ce dernier cas on a mis en evidence des effets de basse sym6trie tels que, par exemple, l'asymetrie des matrices g et A .

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b4223, V.1.2.1 Anhydrous selenites

Pies¹,

Weiss²

Landolt-Börnstein - Group III Condensed Matter

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Refinement of the crystal structure of ferroelectric acid lithium selenite: position of the lithium ion

Cited by 9 publications

References 8 publications

Electron paramagnetic resonance of Mn²⁺ doped in alkali trihydrogen selenite single crystals

Electron paramagnetic resonance of Mn²⁺ doped in alkali trihydrogen selenite single crystals

Electron Paramagnetic Resonance Studies of Cu²⁺ Impurities in Ferroelectric LiH₃(SeO₃)₂

b4223, V.1.2.1 Anhydrous selenites

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Refinement of the crystal structure of ferroelectric acid lithium selenite: position of the lithium ion

Cited by 9 publications

References 8 publications

Electron paramagnetic resonance of Mn2+ doped in alkali trihydrogen selenite single crystals

Electron paramagnetic resonance of Mn2+ doped in alkali trihydrogen selenite single crystals

Electron Paramagnetic Resonance Studies of Cu2+ Impurities in Ferroelectric LiH3(SeO3)2

b4223, V.1.2.1 Anhydrous selenites

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Electron paramagnetic resonance of Mn²⁺ doped in alkali trihydrogen selenite single crystals

Electron paramagnetic resonance of Mn²⁺ doped in alkali trihydrogen selenite single crystals

Electron Paramagnetic Resonance Studies of Cu²⁺ Impurities in Ferroelectric LiH₃(SeO₃)₂