7N tellurium purification txheej txheem ua ke ua ke thaj chaw refining thiab directional crystallization technologies. Cov ntsiab lus tseem ceeb ntawm cov txheej txheem thiab cov kev ntsuas tau piav qhia hauv qab no:
1. Zone Refining Txheej Txheem
Khoom siv tsim
Multi-layer annular zone melting nkoj: Txoj kab uas hla 300-500 mm, qhov siab 50-80 mm, ua los ntawm high-purity quartz los yog graphite.
Cua sov system: Semi-circular resistive coils nrog kub tswj qhov tseeb ntawm ± 0.5 ° C thiab siab tshaj plaws ua haujlwm kub ntawm 850 ° C.
Qhov tseem ceeb Parameter
Nqus: ≤1 × 10⁻³ Pa thoob plaws hauv kev tiv thaiv oxidation thiab paug.
Thaj chaw mus ncig ceev: 2-5 mm / h (unidirectional kev sib hloov ntawm tsav ncej).
Kub gradient: 725 ± 5 ° C ntawm thaj tsam molten pem hauv ntej, txias rau <500 ° C ntawm ntug ntug.
Hla: 10-15 cycles; tshem tawm efficiency> 99.9% rau impurities nrog segregation coefficients <0.1 (piv txwv li, Cu, Pb).
2. Directional Crystallization txheej txheem
Melt Kev Npaj
Khoom siv: 5N tellurium purified ntawm cheeb tsam refining.
Melting tej yam kev mob: Melted nyob rau hauv inert Ar gas (≥99.999% purity) ntawm 500-520 ° C siv high-frequency induction cua sov.
Kev tiv thaiv Melt: High-purity graphite npog los tiv thaiv volatilization; molten pas dej tob tswj ntawm 80-120 mm.
Crystalization Control
Kev loj hlob tus nqi: 1-3 mm / h nrog ntsug kub gradient ntawm 30-50 ° C / cm.
Txias qhov system: Dej-txias tooj liab puag rau yuam hauv qab txias; radiative txias rau saum.
Kev cais tawm impurity: Fe, Ni, thiab lwm yam impurities yog enriched ntawm grain ciam teb tom qab 3-5 remelting cycles, txo concentrations rau ppb qib.
3. Quality Control Metrics
Parameter Standard Tus nqi siv
purity kawg ≥99.99999% (7N)
Tag nrho cov hlau tsis huv ≤0.1 ppm
Cov ntsiab lus oxygen ≤ 5 ppm
Crystal orientation sib txawv ≤2°
Resistivity (300 K) 0.1-0.3 Ω·cm
Txheej Txheem Zoo
Scalability: Multi-layer annular zone melting nkoj nce batch muaj peev xwm los ntawm 3-5 × piv rau cov qauv tsim.
Efficiency: Precise nqus thiab thermal tswj ua kom siab impurity tshem tawm tus nqi.
Crystal zoo: Ultra-slow kev loj hlob tus nqi (<3 mm / h) kom tsis muaj dislocation ceev thiab ib leeg-crystal kev ntseeg.
Qhov no refined 7N tellurium yog ib qho tseem ceeb rau cov kev siv siab heev, suav nrog infrared detectors, CdTe thin-film solar cells, thiab semiconductor substrates.
Cov ntaub ntawv:
denote cov ntaub ntawv sim los ntawm cov neeg tshawb xyuas kev tshawb fawb ntawm tellurium purification.
Post lub sij hawm: Mar-24-2025