Neutron diffraction and X-ray diffraction investigations of langasite crystals

Кузьмичева, Г. М.; Захаркo, O. .; Tyunina, E. A.; Rybakov, Victor B.; Domoroshchina, E. N.; Dubovskii, A. B.

doi:10.1134/s1063774508060126

Cited by 7 publications

(5 citation statements)

References 4 publications

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“…O is the basis of all models of the defect structure of crystals in complex oxides of the langasite family [7,14,17]. It should be noted that the formation of vacancies V •• O is the preferred method for creating a disordered subsystem of mobile conductivity anions in oxygen-conducting solid electrolytes [34].…”

Section: Discussion Of Resultsmentioning

confidence: 99%

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Electrical conductivity and structural conditionality of ion transfer in langasite La-=SUB=-3-=/SUB=-Ga-=SUB=-5-=/SUB=-SiO-=SUB=-14-=/SUB=-:Mn

Sorokin

Golovina

Константинова

2022

Physics of the Solid State

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The temperature dependence of the static electrical conductivity sigmadc(T) of a single crystal of lanthanum gallium silicate (langasite) La3Ga5SiO14 activated with an impurity of Mn (1000 ppm) has been studied by impedance spectroscopy. Impedance measurements of La3Ga5SiO14 (sp. gr. P321, Z=1) were carried out along crystallographic axes a (double symmetry axis) and c (triple symmetry axis). It was found that the values of sigma|| a are significantly higher than the electrical conductivity sigma|| c, the anisotropy of the electrical conductivity is sigma|| a/sigma|| c=170 at 773 K. The activation energy of electrotransport is Esigma=0.75±0.05 and 1.09±0.02 eV along the a and c axes, respectively. The electrical conductivity mechanism has an ionic nature and an impurity character; oxygen vacancies VOoo are the most probable current carriers. Keywords: lanthanum gallium silicate, langasite family, single crystal, electrical conductivity, anisotropy.

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Section: Discussion Of Resultsmentioning

confidence: 99%

“…The main intrinsic defects in La 3 Ga 5 SiO 14 crystals, according to [13,14], are vacancies of oxygen…”

Section: Introductionmentioning

confidence: 99%

Electrical conductivity and structural conditionality of ion transfer in langasite La-=SUB=-3-=/SUB=-Ga-=SUB=-5-=/SUB=-SiO-=SUB=-14-=/SUB=-:Mn

Sorokin

Golovina

Константинова

2022

Physics of the Solid State

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“…The same (upper) parts of crystals 1 and 2 were investigated by the diffraction methods. The compositions of the upper part of the crystal growing from polycrystalline charge differ from those of the lower part [19]. If this crystal will be crushed and regrown the composition will probably be averaged and oxygen content will be increased.…”

Section: Resultsmentioning

confidence: 99%

“…Neutron diffraction investigations of langasite [19] and langatate [20][21][22] single crystals have revealed that the point defects are present in all positions of the structure. In addition, the relationship between the crystal color and the oxygen vacancies contents has been established.…”

Section: Journal Of Materialsmentioning

confidence: 99%

Growth and Neutron Diffraction Investigation of Ca₃NbGa₃Si₂O₁₄ and La₃Ga_5.5Nb_0.5O₁₄ Crystals

Kaurova

Кузьмичева

Rybakov

et al. 2013

Journal of Materials

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Langanite (La3Ga5.5Nb0.5O14, growth atmosphere: 99% Ar + 1% O2) and kanigasite (Ca3NbGa3Si2O14, growth atmosphere: 100% Ar) crystals grown by the Czochralski technique in Ir crucibles along <0001> direction have been firstly investigated by neutron diffraction. The difference between the compositions of upper (La2.935(2)□0.065)(Ga0.450Nb0.550(3))Ga3(Ga1.965(4)□0.035)(O13.90(1)□0.10) and lower (La2.940(1)□0.060)(Ga0.590Nb0.410(2))Ga5(O13.82(1)□0.18) parts of orange langanite crystal was found. It was established that the colorless Ca3NbGa3Si2O14 crystal grown by using the single-crystal charge has the composition (Ca2.95□0.05(1))NbGa3Si2O14 and is less defective in comparison to the yellow one grown by using the charge prepared by conventional solid-state reaction. For Ca3NbGa3Si2O14 and La3Ga5.5Nb0.5O14 crystals the possibility of microtwin formation (two unit cells connected by the translation: 1/2 z) was revealed for the first time. It was found that the difference between the color of crystals is attributed to the qualitative differentiation of oxygen vacancies.

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“…where ÁR i are the differences between the orthogonalized coordinates of common atoms within the same section of asymmetric units of the related structures. For the LGS crystal the neutron coordinates were taken from Kuz'michva et al (2008). The value of I i (7) for these crystals (Table 3) indicates a very high isostructurality index between the combination of two structures, with LGT and LGST showing the highest isostructurality index.…”

Section: Highest Beingmentioning

confidence: 99%

Single-crystal neutron diffraction investigation on crystals belonging to the langasite family: a comparative study

Читра

Choudhury

2010

Acta Crystallogr Sect B

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Crystals of the langasite family are of interest as they are piezoelectric in different devices. The properties of these classes of crystals can be modified within certain limits by isomorphous substitution. Single-crystal neutron diffraction studies were carried out for LGT (La(3)Ga(5.5)Ta(0.5)O(14)), LGST (La(3)Ga(5.25)Ta(0.25)Si(0.5)O(14)) and LGZrT (La(3)Ga(5.25)Ta(0.25)Zr(0.5)O(14)) as the neutron study gives a better average picture of the crystal properties over a macroscopic region of the grown crystal. The effect of small substitutions at various sites on the piezoelectric properties of the crystal was studied.

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Neutron diffraction and X-ray diffraction investigations of langasite crystals

Cited by 7 publications

References 4 publications

Electrical conductivity and structural conditionality of ion transfer in langasite La-=SUB=-3-=/SUB=-Ga-=SUB=-5-=/SUB=-SiO-=SUB=-14-=/SUB=-:Mn

Electrical conductivity and structural conditionality of ion transfer in langasite La-=SUB=-3-=/SUB=-Ga-=SUB=-5-=/SUB=-SiO-=SUB=-14-=/SUB=-:Mn

Growth and Neutron Diffraction Investigation of Ca₃NbGa₃Si₂O₁₄ and La₃Ga_5.5Nb_0.5O₁₄ Crystals

Single-crystal neutron diffraction investigation on crystals belonging to the langasite family: a comparative study

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Neutron diffraction and X-ray diffraction investigations of langasite crystals

Cited by 7 publications

References 4 publications

Electrical conductivity and structural conditionality of ion transfer in langasite La-=SUB=-3-=/SUB=-Ga-=SUB=-5-=/SUB=-SiO-=SUB=-14-=/SUB=-:Mn

Electrical conductivity and structural conditionality of ion transfer in langasite La-=SUB=-3-=/SUB=-Ga-=SUB=-5-=/SUB=-SiO-=SUB=-14-=/SUB=-:Mn

Growth and Neutron Diffraction Investigation of Ca3NbGa3Si2O14 and La3Ga5.5Nb0.5O14 Crystals

Single-crystal neutron diffraction investigation on crystals belonging to the langasite family: a comparative study

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Growth and Neutron Diffraction Investigation of Ca₃NbGa₃Si₂O₁₄ and La₃Ga_5.5Nb_0.5O₁₄ Crystals