Vibrational spectroscopy of GdCr3(BO3)4: quantitative separation of crystalline phases

Dobretsova, Elena; Болдырев, К. Н.; Попова, М. Н.; Chernyshev, V. A.; Borovikova, E. Yu.; Maltsev, V.; Leonyuk, N. I.

doi:10.1088/1742-6596/737/1/012035

Cited by 10 publications

(5 citation statements)

References 16 publications

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“…Most rare-earth aluminium borates, RAl 3 (BO 3 ) 4 , also have a structure type of mineral huntite CaMg 3 (CO 3 ) 4 described by space group R32. However, monoclinic modifications (space group C2/c or C2) were discovered for RAl 3 (BO 3 ) 4 (R = Pr, Nd, Sm, Eu, Gd, Tb, Ho) crystals and the polytype nature of phases R32, C2/c, and C2 was demonstrated [21][22][23], similar to that in rare-earth chromium borates [24]. Trigonal huntite phase R32 may be present in a monoclinic view in accordance with the known transformation of rhombohedral R-cell to monoclinic C-cell [23].…”

Section: Introductionmentioning

confidence: 89%

Crystal Structure of Bismuth-Containing Samarium Iron–Aluminium Borates Sm1−xBixFe3−yAly(BO3)4 (x = 0.05–0.07, y = 0–0.28) in the Temperature Range of 25–500 K

et al. 2023

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Structural features of new mixed bismuth-containing samarium iron–aluminium borate single crystals Sm1−xBixFe3−yAly(BO3)4 (x = 0.05–0.07, y = 0–0.28) were studied using X-ray diffraction analysis based on aluminium content and temperature in the range 25–500 K. The crystals were grown using the solution-in-melt technique with Bi2Mo3O12 in a flux. The composition of the single crystals was analyzed using energy-dispersive X-ray fluorescence and energy-dispersive X-ray elemental analysis. Temperature dependencies of Sm1−xBixFe3−yAly(BO3)4 unit-cell parameters were studied. Negative thermal expansion was identified below 100 K and represented by characteristic surfaces of the thermal expansion tensor. (Sm,Bi)–O, (Sm,Bi)–(Fe,Al), (Fe,Al)–(Fe,Al), and (Fe,Al)–O interatomic distances decreased with the addition of aluminium atoms. An increase in the (Fe,Al)–(Fe,Al) intrachain bond length at low temperatures in the magnetically ordered state weakened this bond, whereas a decrease in the (Fe,Al)–(Fe,Al) interchain distance strengthened super-exchange paths between different chains. It was found that the addition of aluminium atoms influenced interatomic distances in Sm1−xBixFe3−yAly(BO3)4 much more than lowering the temperature from 293 K to 25 K. The effect of aluminium doping on magnetoelectric properties and structural symmetry of rare-earth iron borates is also discussed.

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Section: Introductionmentioning

confidence: 89%

Crystal Structure of Bismuth-Containing Samarium Iron–Aluminium Borates Sm1−xBixFe3−yAly(BO3)4 (x = 0.05–0.07, y = 0–0.28) in the Temperature Range of 25–500 K

et al. 2023

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“…R32 и C2/c. В работе [48] информации об относительном количестве ромбоэдрической и моноклинной модификаций, поскольку силы осцилляторов перехода могут значительно отличаться. На рис.…”

Section: результаты и обсуждениеunclassified

Спектроскопическое исследование структурных и магнитных свойств TbCr-=SUB=-3-=/SUB=-(BO-=SUB=-3-=/SUB=-)-=SUB=-4-=/SUB=-

Kuz'min¹,

Болдырев²,

Maltsev³

2022

Оптика И Спектроскопия

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The paper presents a flux crystal growth technique, studies of the structural peculiarities and the optical absorption spectra of double orthoborate TbCr3(BO3)4 with a huntite structure. The intensities of the phonon modes were used to determine the ratios of the rhombohedral and monoclinic polytypes for this compound, depending on the growth conditions. The broadband absorption spectra of the Tb3+ ions in TbCr3(BO3)4 single crystals were studied in the temperature range from room temperature to 3.0 K. From them, the energies of the crystal-field levels of the Tb3+ ion were determined. The temperature dependence of the absorption spectra of the Er3+ probe ion in TbCr3(BO3)4:Er(1%) shows that there are two phase transitions and agrees with their previously proposed interpretation: at 8.8 K, the chromium subsystem antiferromagnetically orders, and at 5 K, a reorientation of chromium magnetic moments occurs.

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“…Это обстоятельство делает их интересными с точки зрения возможных практических применений. Свойства РЗ хромовых боратов до настоящего времени остаются малоизученными [4][5][6][7][8][9][10][11][12][13][14][15]. Это связано с небольшими размерами кристаллов, а также с их двухфазностью (политипией).…”

Section: Introductionunclassified

“…Установлено, что соотношение этих модификаций в кристалле зависит от условий синтеза и радиуса РЗ иона [5,7]. В работе [6] было проведено разделение колебательных мод, относящихся к фазам R32 и C2/c, и предложена методика оценки соотношение этих фаз в кристаллах GdCr 3 (BO 3 ) 4 . В работах [4,5,7] исследовались области устойчивости РЗ хромовых боратов.…”

Section: Introductionunclassified

Структурные особенности твердых растворов Nd-=SUB=-x-=/SUB=-Gd-=SUB=-1-x-=/SUB=-Cr-=SUB=-3-=/SUB=-(BO-=SUB=-3-=/SUB=-)-=SUB=-4-=/SUB=-

Болдырев¹,

Kuz'min²,

Dobretsova³

2021

Оптика И Спектроскопия

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Optical studies of NdxGd1-xCr3(BO3)4 0.01≤x≤1 crystals have been carried out. A significant concentration effect of the Nd3+ ion on the crystal structure of these solid solutions was identified. It was found from the absorption spectra of neodymium ions in the 4I9/2→11F3/2 transition region that at a concentration x>0.6 two nonequivalent Nd3+ centers appear, which is explained by the formation of two polytype modifications with space groups R32 and C2/c. At a concentration x<0.6, only one modification with the space group R32 is observed.

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Vibrational spectroscopy of GdCr₃(BO₃)₄: quantitative separation of crystalline phases

Cited by 10 publications

References 16 publications

Crystal Structure of Bismuth-Containing Samarium Iron–Aluminium Borates Sm1−xBixFe3−yAly(BO3)4 (x = 0.05–0.07, y = 0–0.28) in the Temperature Range of 25–500 K

Crystal Structure of Bismuth-Containing Samarium Iron–Aluminium Borates Sm1−xBixFe3−yAly(BO3)4 (x = 0.05–0.07, y = 0–0.28) in the Temperature Range of 25–500 K

Спектроскопическое исследование структурных и магнитных свойств TbCr-=SUB=-3-=/SUB=-(BO-=SUB=-3-=/SUB=-)-=SUB=-4-=/SUB=-

Структурные особенности твердых растворов Nd-=SUB=-x-=/SUB=-Gd-=SUB=-1-x-=/SUB=-Cr-=SUB=-3-=/SUB=-(BO-=SUB=-3-=/SUB=-)-=SUB=-4-=/SUB=-

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