Magnetic Resonance and Dielectric Studies of a Nonlinear La3Ga5.5Ta0.5O14Single Crystal Doped with Erbium

Bodziony, T.; Typek, J.; Orłowski, M.; Majszczyk, J.; Wabia, M.; Berkowski, M.; Ryba‐Romanowski, W.; Guskos, N.; Likodimos, V.; Anagnostakis, E. A.

doi:10.12693/aphyspola.103.315

Cited by 2 publications

(4 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A low-field signal visible at 150 mT could be ascribed to the V 4+ ions located at other symmetry sites (i.e. tetrahedral) but, taking into consideration the fact that a very similar low-field signal was observed in our previous reports on LGT crystal doped with Co 2+ ions [28] and LGT crystal doped with Ho 3+ ions [11], it seems more plausible to assign this signal to the iron impurities existing in the starting oxides.…”

Section: Discussionsupporting

confidence: 55%

See 1 more Smart Citation

Site symmetries of vanadium ions in La₃Ga_5.5Ta_0.5O₁₄ single crystals

Fuks

Kaczmarek²,

Berkowski

2006

Physica Status Solidi (a)

Self Cite

View full text Add to dashboard Cite

Vanadium-doped La 3 Ga 5.5 Ta 0.5 O 14 single crystal (0.05 mol% in the melt with respect to Ga) grown by the Czochralski method has been investigated using electron paramagnetic resonance (EPR) and optical absorption measurements. The optical energy gap of pure La 3 Ga 5.5 Ta 0.5 O 14 single crystal is equal to 4.94 eV, while the value for vanadium-doped La 3 Ga 5.5 Ta 0.5 O 14 single crystal is 3.44 eV. Optical absorption measurements have revealed 444 nm, 700 nm and 1100 nm bands arising mainly from V 3+ ions at octahedral sites. Moreover, V 4+ ions were found at octahedral sites (525 nm band) for the "as-grown" crystals and at tetrahedral positions (380 nm CT band and 600-and 800 nm dd transitions) for crystals irradiated with γ-quanta with a dose of 1.2 × 10 5 Gy. The X-band EPR measurements have been done at room temperature while rotating the single-crystal sample around a, b* and c crystal axes. For each rotation direction the observed spectra consist of an intense multiline signal centred at ∼ 340 mT and a second, weak one at ∼ 150 mT. The dominant signal can be ascribed to the V 4+ ions (S = 1/2, I = 7/2) occupying the Ga1, Ta octahedral positions, with an axial D 3 point symmetry. The principal tensor values are determined as g || = 1.925(5), g ⊥ = 1.958(5), A || = 17.0(5) mT and A ⊥ = 5.8(5) mT. Each principal axis of the vanadium paramagnetic centres indeed reveals three different orientations in La 3 Ga 5.5 Ta 0.5 O 14 crystal with respect to the space orientation of the Ga3 tetrahedra connected with the Ga1 octahedron. The low-field resonance signal could neither be ascribed to iron impurities nor to the V 4+ ions (S = 1/2, I = 7/2) occupying other (tetrahedral) positions simultaneously creating the vacancy state. This signal was too weak to perform detailed analysis. There are also presented low-temperature EPR spectra that did not reveal any new lines.La 3 Ga 5.5 Ta 0.5 O 14 (LGT) and related compounds belongs to a family of oxides having Ca 3 Ga 2 Ge 4 O 14 -type structure [1]. The LGT crystals have trigonal structure with space group P321, class 32; accordingly, they are expected to exhibit piezoelectric and nonlinear optical properties. Recently, they have become promising for acousto-electronic applications and for design of piezoelectric sensors [2,3]. Advantageously important optical activity of LGT and LGN (La 3 Ga 5.5 Nb 0.5 O 14 ) has been noticed, too [4,5]. In addition, LGT crystals reveal no structural phase transition between room temperature and the melting point (1470 °C) [2], thus facilitating potential applications in this temperature range.Another promising feature of all the crystals mentioned above is related to the fact that they can be doped by both rare-earth and transition-metal ions. Laser performance of LGS (La 3 Ga 5 SiO 14 ) doped with

show abstract

Section: Discussionsupporting

confidence: 55%

“…Although there are some previous papers concerning crystal growth and properties of undoped and doped LGT crystal [1][2][3][4][5][6][7][8][9][10][11], no article on LGT crystal with V 3+ or V 4+ ions has been reported.…”

mentioning

confidence: 99%

Site symmetries of vanadium ions in La₃Ga_5.5Ta_0.5O₁₄ single crystals

Fuks

Kaczmarek²,

Berkowski

2006

Physica Status Solidi (a)

Self Cite

View full text Add to dashboard Cite

show abstract

“…The other two signals, at 50 and 240 mT, may be assigned to pairs of erbium ions, resulting from the crystal lattice dislocations. Similar conclusions were reported by Bodziony et al [13], however they assumed that signals observed at low fields are assigned to an unknown impurity. They have investigated, however, LGT single crystals with lower concentration of erbium (0.1 at.%).…”

Section: Table Isupporting

confidence: 86%

“…(1.14 Å) [13] or Sm 3+ (1.23 Å) [11] ions, one can expect that both types of ions enter substitutionally into La 3+ (1.30 Å) site with low C 2 symmetry. However it is not obvious.…”

Section: +mentioning

confidence: 99%

Magnetic Properties of La₃Ga_5.5Ta_0.5O₁₄ Single Crystals Doped with Sm³⁺ and Er³⁺ Ions

Kaczmarek¹,

Leniec²,

Berkowski

et al. 2017

Acta Phys. Pol. A

Self Cite

View full text Add to dashboard Cite

Electron paramagnetic resonance and magnetic susceptibility measurements were performed for two La3Ga5.5Ta0.5O14 single crystals doped with 1.96 at.% of Sm 3+ ions and 3.8 at.% of Er 3+ ions. Two magnetically inequivalent sites were found to be responsible for the electron paramagnetic resonance spectra of Sm 3+ ions. Both sites reveal a low (at least C2) symmetry with gx ∼ 0.46, gy ∼ 0.46 and gz ∼ 0.52. The symmetry of isolated erbium ions is higher than C2. From electron paramagnetic resonance and magnetic susceptibility experiments it results that the ground state of Er 3+ ions is Γ 6 or Γ 7 . Below 51 K electronic transitions within Γ 6 doublets take place. Between 51 and 60 K, Γ 6 to Γ 7 transitions dominate, while above 60 K mainly transitions within Γ 7 doublet are active.

show abstract

Magnetic Resonance and Dielectric Studies of a Nonlinear La₃Ga_5.5Ta_0.5O₁₄Single Crystal Doped with Erbium

Cited by 2 publications

References 7 publications

Site symmetries of vanadium ions in La₃Ga_5.5Ta_0.5O₁₄ single crystals

Site symmetries of vanadium ions in La₃Ga_5.5Ta_0.5O₁₄ single crystals

Magnetic Properties of La₃Ga_5.5Ta_0.5O₁₄ Single Crystals Doped with Sm³⁺ and Er³⁺ Ions

Contact Info

Product

Resources

About

Magnetic Resonance and Dielectric Studies of a Nonlinear La3Ga5.5Ta0.5O14Single Crystal Doped with Erbium

Cited by 2 publications

References 7 publications

Site symmetries of vanadium ions in La3Ga5.5Ta0.5O14 single crystals

Site symmetries of vanadium ions in La3Ga5.5Ta0.5O14 single crystals

Magnetic Properties of La3Ga5.5Ta0.5O14 Single Crystals Doped with Sm3+ and Er3+ Ions

Contact Info

Product

Resources

About

Magnetic Resonance and Dielectric Studies of a Nonlinear La₃Ga_5.5Ta_0.5O₁₄Single Crystal Doped with Erbium

Site symmetries of vanadium ions in La₃Ga_5.5Ta_0.5O₁₄ single crystals

Site symmetries of vanadium ions in La₃Ga_5.5Ta_0.5O₁₄ single crystals

Magnetic Properties of La₃Ga_5.5Ta_0.5O₁₄ Single Crystals Doped with Sm³⁺ and Er³⁺ Ions