Coexistence of intrinsic and extrinsic origins of room temperature ferromagnetism in as implanted and thermally annealed ZnO films probed by x-ray absorption spectroscopy

2013 ◽  
Vol 113 (18) ◽  
pp. 183708 ◽  
Author(s):  
P. Satyarthi ◽  
S. Ghosh ◽  
B. Pandey ◽  
P. Kumar ◽  
C. L. Chen ◽  
...  
Keyword(s):  
Absorption Spectroscopy ◽  
Room Temperature ◽  
Room Temperature Ferromagnetism ◽  
Zno Films ◽  
X Ray ◽  
X Ray Absorption

Probing origin of room temperature ferromagnetism in Ni ion implanted ZnO films with x-ray absorption spectroscopy

2012 ◽  
Vol 111 (1) ◽  
pp. 013715 ◽  
Author(s):  
P. Srivastava ◽  
S. Ghosh ◽  
B. Joshi ◽  
P. Satyarthi ◽  
P. Kumar ◽  
...  
Keyword(s):  
Absorption Spectroscopy ◽  
Room Temperature ◽  
Room Temperature Ferromagnetism ◽  
Zno Films ◽  
X Ray ◽  
X Ray Absorption ◽  
Ion Implanted

Defects in room-temperature ferromagnetic Cu-doped ZnO films probed by x-ray absorption spectroscopy

2012 ◽  
Vol 24 (30) ◽  
pp. 306002 ◽  
Author(s):  
Q Ma ◽  
J T Prater ◽  
C Sudakar ◽  
R A Rosenberg ◽  
J Narayan
Keyword(s):  
Absorption Spectroscopy ◽  
Room Temperature ◽  
Zno Films ◽  
X Ray ◽  
Doped Zno ◽  
X Ray Absorption

scholarly journals Soft x-ray absorption spectroscopy of metalloproteins and high-valent metal-complexes at room temperature using free-electron lasers

2017 ◽  
Vol 4 (5) ◽  
pp. 054307 ◽  
Author(s):  
Markus Kubin ◽  
Jan Kern ◽  
Sheraz Gul ◽  
Thomas Kroll ◽  
Ruchira Chatterjee ◽  
...  
Keyword(s):  
Metal Complexes ◽  
Absorption Spectroscopy ◽  
Free Electron ◽  
Room Temperature ◽  
Free Electron Lasers ◽  
X Ray ◽  
High Valent ◽  
X Ray Absorption

X-ray absorption spectroscopy study of Ga-doping in reactively sputtered ZnO films

2020 ◽  
Vol 701 ◽  
pp. 137966
Author(s):  
Shravan K. Appani ◽  
Ashok Kumar Yadav ◽  
D.S. Sutar ◽  
S.N. Jha ◽  
D. Bhattacharyya ◽  
...  
Keyword(s):  
Absorption Spectroscopy ◽  
Zno Films ◽  
Spectroscopy Study ◽  
X Ray ◽  
X Ray Absorption ◽  
Ga Doping

Recovery of nanosize zinc from phosphor wastes with an ionic liquid

2009 ◽  
Vol 6 (3) ◽  
pp. 268 ◽  
Author(s):  
Hsin-Liang Huang ◽  
H. Paul Wang ◽  
Edward M. Eyring ◽  
Juu-En Chang
Keyword(s):  
Ionic Liquid ◽  
Absorption Spectroscopy ◽  
Room Temperature ◽  
Bond Distance ◽  
Extraction Process ◽  
Room Temperature Ionic Liquid ◽  
Zns Nanoparticles ◽  
Recovery Method ◽  
X Ray ◽  
X Ray Absorption

Environmental context. Very fine phosphor ashes are discharged from particulate collection systems (such as bag houses) in the cathode ray tube or television disassembling processes. Effective recovery of ZnO and ZnS nanoparticles from the phosphor ash can be achieved by extraction with a room temperature ionic liquid. By synchrotron radiation X-ray absorption spectroscopy, the obtained molecular scale data turn out to be very useful in revealing speciation of zinc in the extraction process, which also facilitates the development of a simple nanoparticle recovery method. Abstract. An effective, simple method has been developed for the recovery of ZnO and ZnS nanoparticles from hazardous phosphor ash waste. Experimentally, zinc (77%) in the phosphor ash (that contains mainly zinc (91%)) can be recovered by extraction with a room temperature ionic liquid (RTIL) ([C4mim][PF6], 1-butyl-3-methylimidazolium hexafluorophosphate). Component fitted X-ray absorption near edge structure (XANES) spectra of zinc indicate that metallic zinc (Zn) (9%) in the phosphor ash can be dissolved to form a Zn2+–1-methylimidazole ([mim]) complex during extraction with the RTIL. ZnS and ZnO nanoparticles (60–61%) can also be extracted from the phosphor. Over the 298–523 K temperature range, desired ZnO/ZnS ratios (0.3–0.6) can be obtained since interconversion of ZnS to ZnO in the RTIL is temperature dependent. The Fourier transformed extended X-ray absorption fine structure (EXAFS) data also show that the nanosize ZnS extracted in the RTIL possesses a Zn–S bond distance of 2.33 Å with coordination numbers (CNs) of 3.6–3.7. At 523 K, in the RTIL, ~30% of the ZnS is oxidised to form octahedral ZnO (with a bond distance of 2.10 Å and a CN of 6.1) that may coat the surfaces of the ZnS nanoparticles. This work exemplifies the utilisation of X-ray absorption spectroscopy (EXAFS and XANES) to reveal speciation and possible reaction pathways in a nanoparticle extraction process (with a RTIL) in detail.

scholarly journals X-ray Absorption Spectroscopy Studies of the Room-Temperature Ferromagnetic Fe-Doped 6H-BaTiO3

2014 ◽  
Vol 98 (4) ◽  
pp. 1156-1161 ◽  
Author(s):  
Iuliia Mikulska ◽  
Matjaz Valant ◽  
Iztok Arčon ◽  
Darja Lisjak
Keyword(s):  
Absorption Spectroscopy ◽  
Room Temperature ◽  
X Ray ◽  
Spectroscopy Studies ◽  
X Ray Absorption

X-RAY PHOTOEMISSION ELECTRON MICROSCOPE DETERMINATION OF ORIGINS OF ROOM TEMPERATURE FERROMAGNETISM AND PHOTOLUMINESCENCE IN HIGH Co-CONTENT CoxZn1-xO FILMS

2014 ◽  
Vol 21 (04) ◽  
pp. 1450058 ◽  
Author(s):  
WEI CAO ◽  
VLADIMIR PANKRATOV ◽  
MARKO HUTTULA ◽  
LIANA SHIRMANE ◽  
YU RAN NIU ◽  
...  
Keyword(s):  
Electron Microscope ◽  
Room Temperature ◽  
Room Temperature Ferromagnetism ◽  
Luminescence Properties ◽  
Edge Structure ◽  
X Ray ◽  
Zno Nanoclusters ◽  
X Ray Absorption ◽  
Photoemission Electron

In this paper, we reported on the X-ray photoemission electron microscope (XPEEM) determination of magnetic and luminescence origins for two Co x Zn 1-x O films. The cobalt fraction x of radio frequency co-sputtered samples were 0.86(2) and 0.92(2), respectively. Films were ferromagnetic and semiconductive. Unique narrow green color lines beside the ZnO intrinsic emissions were found with a decay time in microsecond range at room temperature. Origins of magnetic and luminescence properties were determined with XPEEM. The X-ray absorption near edge structure at the Co  L3-edge denoted that Co was partially oxidized, and phase-contrast images together with chemical composition identification further proved that Co and CoO co-existed in the samples. The ferromagnetism was attributed to ferromagnetism of Co clusters partially canceled by the antiferromagnetism of its oxide, and the photoluminescence to bound exciton in ZnO nanoclusters and defect related centers of ZnO nanoclusters in a Co -rich matrix. Present results show possibilities for adjusting magnetic and luminescence properties of Co – ZnO compounds by changing the cobalt concentration.

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