Paramagnetic centres in X‐irradiated LiNaSO<sub>4</sub> single crystals

Alybakov, A. A.; Bujko, V. M.; Sharsheev, K.

doi:10.1002/crat.19810160514

Cited by 10 publications

References 9 publications

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Optical absorption spectra of Cr³⁺ ions in LiNaSO₄ and LiKSO₄ crystals

Alybakov

Gubanova

Sharsheev

1982

Cryst. Res. Technol.

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Earlier (ALYBAKOV et al.; ALYBAKOV, SHARSHEEV) we have studied the EPR spectra of irradiated undoped LiNaSO., and LiKSO, single crystals. This paper presents the results concerning the optical absorption spectra of C?+ ions doped in these crystals.LiKSO, and LiNaSO, single crystals were grown from saturated aqueous solutions doped with Cr,(SO,), . 6 H,O in amounts of 1.5 g/1 and 0.2 g/l, respectively. Both crystals had green colour. Absorption spectra were measured on Unicam SP8-100 spectrophotometer using a nitrogen cryostat. Figure 1 shows absorption spectra of doped crystals. In both cases spectra are qualitatively similar and consist of four absorption bands. These bands positions are given in Table 1.In principle, impurity C?' ion in LiKSO, and LiNaSO, crystals can substitute either Li', or K + (Na+)ion. It is known (KLIMOVA et al.) that in LiKSO, crystals potassium ions occupy octahedral cavities and lithium ions occupy tetrahedra of SO,'-anions. Absence of some splitting in optical absorption spectra at the liquid nitrogen temperature and observation of EPR spectra of doped crystals at the room temperature are indicative of octahedral co-ordination of C$+ ions. Two strong and wide absorption bands in the visible region, characteristic of C?' in octahedral co-ordination, were observed also in other ionic crystals (SVIRIDOV et ah). Hence, we can conclude that Cr3+ ions enter the mixed lithium-potassium and lithium-sodium sulphates substituting K + and Na' ions, respectively.

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Optical absorption spectra of Cr³⁺ ions in LiNaSO₄ and LiKSO₄ crystals

Alybakov

Gubanova

Sharsheev

1982

Cryst. Res. Technol.

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Paramagnetic centres in X‐irradiated LiNaSO₄ single crystals: A comment

Lehmann

1983

Cryst. Res. Technol.

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Alybakov¹,

Bujko²,

Sharsheev³

1983

Cryst. Res. Technol.

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LEHMANN (1983) commented on our "Paramagnetic Centres in X-irradiated LiNaSO, Single Crystals" (ALYBAKOV et al. 1981). We want to reply to these comments. As additional experimental data given below show, there is no error in the presentation of our experimental results.As it was noted earlier (ALYBAKOV et al. 1981), EPR spectrum of X-irradiated LiNaSO, crystal, measured at room temperature (RT) for arbitrary crystal orientations, shows 7 lines -A, -4, B, ,2, and C. Investigation of anguIar dependences at RT shows that A, -, and B1,2 lines indeed merge into one line for H 11 c. But spectrum changes gradually when cooling. Spectra, taken for two crystal orientations during the gradual cooling from RT to liquid nitrogen temperature (LNT), are shown in Figure 1. (It should be emphasized that spectra for each orientation were measured without any change of the crystal position).Spectrum, taken at RT for H 11 e, shows two lines: high-field intensive C-line and low-A3,4* Bl,.?A 1-0 + B y Fig. 1. EPR spectra of X-irradiated LiNaSO, crystal, measured at RT (l), -100 "C (2), -150 "C (3). and LNT (4)

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Paramagnetic centres in X‐irradiated LiNaSO₄ single crystals

Cited by 10 publications

References 9 publications

Optical absorption spectra of Cr³⁺ ions in LiNaSO₄ and LiKSO₄ crystals

Optical absorption spectra of Cr³⁺ ions in LiNaSO₄ and LiKSO₄ crystals

Paramagnetic centres in X‐irradiated LiNaSO₄ single crystals: A comment

Reply to comments on “paramagnetic centres in X‐irradiated LiNaSO₄ single crystals”

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Paramagnetic centres in X‐irradiated LiNaSO4 single crystals

Cited by 10 publications

References 9 publications

Optical absorption spectra of Cr3+ ions in LiNaSO4 and LiKSO4 crystals

Optical absorption spectra of Cr3+ ions in LiNaSO4 and LiKSO4 crystals

Paramagnetic centres in X‐irradiated LiNaSO4 single crystals: A comment

Reply to comments on “paramagnetic centres in X‐irradiated LiNaSO4 single crystals”

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Paramagnetic centres in X‐irradiated LiNaSO₄ single crystals

Optical absorption spectra of Cr³⁺ ions in LiNaSO₄ and LiKSO₄ crystals

Optical absorption spectra of Cr³⁺ ions in LiNaSO₄ and LiKSO₄ crystals

Paramagnetic centres in X‐irradiated LiNaSO₄ single crystals: A comment

Reply to comments on “paramagnetic centres in X‐irradiated LiNaSO₄ single crystals”