56 research outputs found
Π‘ΠΠ‘Π’ΠΠ Π Π‘Π’Π ΠΠΠΠΠ Π‘ΠΠΠΠΠΠΠΠΠ Π‘ΠΠΠΠΠ‘Π’ΠΠ Π₯ΠΠΠ’ΠΠ’Π
The literature data on the composition and structure of rare-earth borate compounds of the huntite family with the general composition LnM3(BO3)4, where Ln3+ = Y, La = Lu and M3+ = Al, Fe, Cr, Ga, Sc as well as a number of solid solutions with Π3+ = Sc are systematized. The difference between the real compositions of crystals and the compositions of the initial mixture, the most characteristic of rare-earth scandium borates, is shown. The significant role of the composition in the manifestation of the compounds symmetry is established. The necessity of determining the crystals symmetry only on single-crystals with detailed analysis of diffraction reflections is proved. Morphotropic series were selected depending on changes in the ionic radii of Ln and M. Attention is paid to the peculiarity of the structural behavior of Cr3+ ions. It was revealed that the formation of solid solutions and internal solid solutions is most likely for rare-earth scandium borates. The implementation of polytypic modifications for LnM3(BO3)4, where M3+ = Al, Cr, and polymorphs for a number of Ln ions with M3+ = Fe, the existence of which is not excluded for M3+ = Sc, is demonstrated. Crystal-chemical effects observed for huntite-like crystals (morphotropy, isomorphism, polymorphism, polytypy; internal solid solutions; phase order-disorder phase transitions of different nature) with specific features of scandium borates are presented. The realization of polymorphism and polytypism for compounds of the huntite family confirms the crystal-chemical situation, according to which hightemperature polymorphic modifications should form more symmetrical compounds, but it is not typical of polytypic modifications.ΠΡΠΎΠ²Π΅Π΄Π΅Π½Π° ΡΠΈΡΡΠ΅ΠΌΠ°ΡΠΈΠ·Π°ΡΠΈΡ Π»ΠΈΡΠ΅ΡΠ°ΡΡΡΠ½ΡΡ
Π΄Π°Π½Π½ΡΡ
ΠΏΠΎ ΡΠΎΡΡΠ°Π²Ρ ΠΈ ΡΡΡΠΎΠ΅Π½ΠΈΡ ΡΠ΅Π΄ΠΊΠΎΠ·Π΅ΠΌΠ΅Π»ΡΠ½ΡΡ
Π±ΠΎΡΠ°ΡΠΎΠ² ΡΠ΅ΠΌΠ΅ΠΉΡΡΠ²Π° Ρ
Π°Π½ΡΠΈΡΠ° ΠΎΠ±ΡΠ΅Π³ΠΎ ΡΠΎΡΡΠ°Π²Π° LnM3(BO3)4, Π³Π΄Π΅ Ln3+ = Y, La-Lu, ΠΈ M3+ = Al, Fe, Cr, Ga, Sc, Π° ΡΠ°ΠΊΠΆΠ΅ ΡΡΠ΄Π° ΡΠ²Π΅ΡΠ΄ΡΡ
ΡΠ°ΡΡΠ²ΠΎΡΠΎΠ² Ρ Π3+ = Sc. ΠΠΎΠΊΠ°Π·Π°Π½ΠΎ ΠΎΡΠ»ΠΈΡΠΈΠ΅ ΡΠ΅Π°Π»ΡΠ½ΡΡ
ΡΠΎΡΡΠ°Π²ΠΎΠ² ΠΊΡΠΈΡΡΠ°Π»Π»ΠΎΠ² ΠΎΡ ΡΠΎΡΡΠ°Π²ΠΎΠ² ΠΈΡΡ
ΠΎΠ΄Π½ΠΎΠΉ ΡΠΈΡ
ΡΡ, Π½Π°ΠΈΠ±ΠΎΠ»Π΅Π΅ Ρ
Π°ΡΠ°ΠΊΡΠ΅ΡΠ½ΠΎΠ΅ Π΄Π»Ρ ΡΠ΅Π΄ΠΊΠΎΠ·Π΅ΠΌΠ΅Π»ΡΠ½ΡΡ
ΡΠΊΠ°Π½Π΄ΠΈΠ΅Π²ΡΡ
Π±ΠΎΡΠ°ΡΠΎΠ². Π£ΡΡΠ°Π½ΠΎΠ²Π»Π΅Π½Π° Π·Π½Π°ΡΠΈΠΌΠ°Ρ ΡΠΎΠ»Ρ ΡΠΎΡΡΠ°Π²Π° Π² ΠΏΡΠΎΡΠ²Π»Π΅Π½ΠΈΠΈ ΡΠΈΠΌΠΌΠ΅ΡΡΠΈΠΈ ΡΠΎΠ΅Π΄ΠΈΠ½Π΅Π½ΠΈΠΉ ΠΈ Π΄ΠΎΠΊΠ°Π·Π°Π½Π° Π½Π΅ΠΎΠ±Ρ
ΠΎΠ΄ΠΈΠΌΠΎΡΡΡ ΠΎΠΏΡΠ΅Π΄Π΅Π»Π΅Π½ΠΈΡ ΡΠΈΠΌΠΌΠ΅ΡΡΠΈΠΈ ΠΊΡΠΈΡΡΠ°Π»Π»ΠΎΠ² ΡΠΎΠ»ΡΠΊΠΎ Π½Π° ΠΌΠΎΠ½ΠΎΠΊΡΠΈΡΡΠ°Π»Π»ΠΈΡΠ΅ΡΠΊΠΈΡ
ΠΎΠ±ΡΠ΅ΠΊΡΠ°Ρ
c Π΄Π΅ΡΠ°Π»ΡΠ½ΡΠΌ Π°Π½Π°Π»ΠΈΠ·ΠΎΠΌ Π΄ΠΈΡΡΠ°ΠΊΡΠΈΠΎΠ½Π½ΡΡ
ΠΎΡΡΠ°ΠΆΠ΅Π½ΠΈΠΉ. ΠΡΠ΄Π΅Π»Π΅Π½Ρ ΠΌΠΎΡΡΠΎΡΡΠΎΠΏΠ½ΡΠ΅ ΡΡΠ΄Ρ Π² Π·Π°Π²ΠΈΡΠΈΠΌΠΎΡΡΠΈ ΠΎΡ ΠΈΠ·ΠΌΠ΅Π½Π΅Π½ΠΈΡ ΠΈΠΎΠ½Π½ΡΡ
ΡΠ°Π΄ΠΈΡΡΠΎΠ² Ln ΠΈ Π. ΠΠ±ΡΠ°ΡΠ΅Π½ΠΎ Π²Π½ΠΈΠΌΠ°Π½ΠΈΠ΅ Π½Π° ΠΎΡΠΎΠ±Π΅Π½Π½ΠΎΡΡΡ ΡΡΡΡΠΊΡΡΡΠ½ΠΎΠ³ΠΎ ΠΏΠΎΠ²Π΅Π΄Π΅Π½ΠΈΡ ΠΈΠΎΠ½ΠΎΠ² Cr3+. ΠΡΡΠ²Π»Π΅Π½ΠΎ, ΡΡΠΎ ΠΎΠ±ΡΠ°Π·ΠΎΠ²Π°Π½ΠΈΠ΅ ΡΠ²Π΅ΡΠ΄ΡΡ
ΡΠ°ΡΡΠ²ΠΎΡΠΎΠ² ΠΈ Π²Π½ΡΡΡΠ΅Π½Π½ΠΈΡ
ΡΠ²Π΅ΡΠ΄ΡΡ
ΡΠ°ΡΡΠ²ΠΎΡΠΎΠ² Π½Π°ΠΈΠ±ΠΎΠ»Π΅Π΅ Π²Π΅ΡΠΎΡΡΠ½ΠΎ Π΄Π»Ρ ΡΠ΅Π΄ΠΊΠΎΠ·Π΅ΠΌΠ΅Π»ΡΠ½ΡΡ
ΡΠΊΠ°Π½Π΄ΠΈΠ΅Π²ΡΡ
Π±ΠΎΡΠ°ΡΠΎΠ². ΠΡΠΎΠ΄Π΅ΠΌΠΎΠ½ΡΡΡΠΈΡΠΎΠ²Π°Π½Π° ΡΠ΅Π°Π»ΠΈΠ·Π°ΡΠΈΡ ΠΏΠΎΠ»ΠΈΡΠΈΠΏΠ½ΡΡ
ΠΌΠΎΠ΄ΠΈΡΠΈΠΊΠ°ΡΠΈΠΉ Π΄Π»Ρ LnM3(BO3)4, Π³Π΄Π΅ M3+ = Al, Cr, ΠΏΠΎΠ»ΠΈΠΌΠΎΡΡΠΎΠ² Π΄Π»Ρ ΡΡΠ΄Π° Ln c Π3+ = Fe, ΡΡΡΠ΅ΡΡΠ²ΠΎΠ²Π°Π½ΠΈΠ΅ ΠΊΠΎΡΠΎΡΡΡ
Π½Π΅ ΠΈΡΠΊΠ»ΡΡΠ΅Π½ΠΎ Π΄Π»Ρ Π3+ = Sc. ΠΡΠ΅Π΄ΡΡΠ°Π²Π»Π΅Π½Ρ ΠΊΡΠΈΡΡΠ°Π»Π»ΠΎΡ
ΠΈΠΌΠΈΡΠ΅ΡΠΊΠΈΠ΅ ΡΡΡΠ΅ΠΊΡΡ, Π½Π°Π±Π»ΡΠ΄Π°Π΅ΠΌΡΠ΅ Π΄Π»Ρ Ρ
Π°Π½ΡΠΈΡΠΎΠΏΠΎΠ΄ΠΎΠ±Π½ΡΡ
ΠΊΡΠΈΡΡΠ°Π»Π»ΠΎΠ² (ΠΌΠΎΡΡΠΎΡΡΠΎΠΏΠΈΡ, ΠΈΠ·ΠΎΠΌΠΎΡΡΠΈΠ·ΠΌ, ΠΏΠΎΠ»ΠΈΠΌΠΎΡΡΠΈΠ·ΠΌ, ΠΏΠΎΠ»ΠΈΡΠΈΠΏΠΈΡ; Π²Π½ΡΡΡΠ΅Π½Π½ΠΈΠ΅ ΡΠ²Π΅ΡΠ΄ΡΠ΅ ΡΠ°ΡΡΠ²ΠΎΡΡ; ΡΠ°Π·ΠΎΠ²ΡΠ΅ ΠΏΠ΅ΡΠ΅Ρ
ΠΎΠ΄Ρ Β«ΠΏΠΎΡΡΠ΄ΠΎΠΊ-Π±Π΅ΡΠΏΠΎΡΡΠ΄ΠΎΠΊΒ» ΡΠ°Π·Π½ΠΎΠΉ ΠΏΡΠΈΡΠΎΠ΄Ρ) ΡΠΎ ΡΠΏΠ΅ΡΠΈΡΠΈΠΊΠΎΠΉ Π΄Π»Ρ ΡΠΊΠ°Π½Π΄ΠΈΠ΅Π²ΡΡ
Π±ΠΎΡΠ°ΡΠΎΠ². Π Π΅Π°Π»ΠΈΠ·Π°ΡΠΈΡ ΠΏΠΎΠ»ΠΈΠΌΠΎΡΡΠΈΠ·ΠΌΠ° ΠΈ ΠΏΠΎΠ»ΠΈΡΠΈΠΏΠΈΠ·ΠΌΠ° Π΄Π»Ρ ΡΠΎΠ΅Π΄ΠΈΠ½Π΅Π½ΠΈΠΉ ΡΠ΅ΠΌΠ΅ΠΉΡΡΠ²Π° Ρ
Π°Π½ΡΠΈΡΠ° ΠΏΠΎΠ΄ΡΠ²Π΅ΡΠΆΠ΄Π°Π΅Ρ ΠΊΡΠΈΡΡΠ°Π»Π»ΠΎΡ
ΠΈΠΌΠΈΡΠ΅ΡΠΊΠΎΠ΅ ΠΏΠΎΠ»ΠΎΠΆΠ΅Π½ΠΈΠ΅, ΡΠΎΠ³Π»Π°ΡΠ½ΠΎ ΠΊΠΎΡΠΎΡΠΎΠΌΡ Π²ΡΡΠΎΠΊΠΎΡΠ΅ΠΌΠΏΠ΅ΡΠ°ΡΡΡΠ½ΡΠ΅ ΠΏΠΎΠ»ΠΈΠΌΠΎΡΡΠ½ΡΠ΅ ΠΌΠΎΠ΄ΠΈΡΠΈΠΊΠ°ΡΠΈΠΈ Π΄ΠΎΠ»ΠΆΠ½Ρ ΠΎΠ±ΡΠ°Π·ΠΎΠ²ΡΠ²Π°ΡΡ Π±ΠΎΠ»Π΅Π΅ ΡΠΈΠΌΠΌΠ΅ΡΡΠΈΡΠ½ΡΠ΅ ΡΠΎΠ΅Π΄ΠΈΠ½Π΅Π½ΠΈΡ, Π° Π΄Π»Ρ ΠΏΠΎΠ»ΠΈΡΠΈΠΏΠ½ΡΡ
ΠΌΠΎΠ΄ΠΈΡΠΈΠΊΠ°ΡΠΈΠΉ ΡΡΠΎ Π½Π΅ Ρ
Π°ΡΠ°ΠΊΡΠ΅ΡΠ½ΠΎ
Effect of cation vacancies on the crystal structure and luminescent properties of Ca 0.85β1.5x Gd x Eu 0.1 β‘ 0.05+0.5x WO 4 (0 β€ x Β β€Β 0.567) scheelite-based red phosphors
ChemInform Abstract: Disordered Structures of Rare-Earth Scandoborates of the Huntite Family.
ChemInform Abstract: Synthesis and X-Ray Diffraction Study of (Aβ²,A)CuO2 Phases (Aβ²: Sr, Ba; A: Ca, Sr, Ln).
Synthesis, Structure, and the Superconducting and Magnetic Properties of RuSr2LnCu2O8-Ξ³ and RuSr2 (Ln,Ce)2Cu2O10-Ξ³
ChemInform Abstract: Neutron Diffraction Study on the Structure of Yttrium-Scandium- Aluminum Garnet.
The color of langatate crystals and its relationship with composition and optical properties
ChemInform Abstract: Crystallochemical and Physicochemical Properties of the Ba3Ln2S6 Phases.
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