Multicomponent equiatomic rare earth oxides with a narrow band gap and associated praseodymium multivalency

2017 ◽  
Vol 46 (36) ◽  
pp. 12167-12176 ◽  
Author(s):  
Abhishek Sarkar ◽  
Christoph Loho ◽  
Leonardo Velasco ◽  
Tiju Thomas ◽  
Subramshu S. Bhattacharya ◽  
...  
Keyword(s):  
Rare Earth ◽  
Band Gap ◽  
Oxygen Vacancies ◽  
Narrow Band ◽  
Rare Earth Oxides ◽  
Phase Pure ◽  
High Level

Phase pure multinary rare earth oxides, containing multivalent praseodymium, have a narrow band gap and a high level of oxygen vacancies.

Oxygen vacancies in transition metal and rare earth oxides: Current state of understanding and remaining challenges

2007 ◽  
Vol 62 (6) ◽  
pp. 219-270 ◽  
Author(s):  
M. Verónica Ganduglia-Pirovano ◽  
Alexander Hofmann ◽  
Joachim Sauer
Keyword(s):  
Rare Earth ◽  
Transition Metal ◽  
Oxygen Vacancies ◽  
Rare Earth Oxides ◽  
Current State

Hydrogenated CeO2−xSx mesoporous hollow spheres for enhanced solar driven water oxidation

2016 ◽  
Vol 52 (12) ◽  
pp. 2521-2524 ◽  
Author(s):  
Yuting Xiao ◽  
Yajie Chen ◽  
Ying Xie ◽  
Guohui Tian ◽  
Shien Guo ◽  
...  
Keyword(s):  
Synergistic Effect ◽  
Band Gap ◽  
Carrier Concentration ◽  
Water Oxidation ◽  
Doping Level ◽  
Oxygen Vacancies ◽  
Narrow Band ◽  
Hollow Spheres ◽  
Sulfur Doping

Hydrogenated CeO2−xSx mesoporous hollow spheres were prepared and exhibited much higher rates of O2 evolution than CeO2 and CeO2−xSx due to the synergistic effect of high sulfur doping level, narrow band gap, moderate oxygen vacancies and higher carrier concentration.

K8Ce2I18O53: a novel potassium cerium(iv) iodate with enhanced visible light driven photocatalytic activity resulting from polar zero dimensional [Ce(IO3)8]4− units

2017 ◽  
Vol 46 (13) ◽  
pp. 4170-4173 ◽  
Author(s):  
Ruofei Wu ◽  
Xingxing Jiang ◽  
Mingjun Xia ◽  
Lijuan Liu ◽  
Xiaoyang Wang ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Rare Earth ◽  
Visible Light ◽  
Band Gap ◽  
Narrow Band ◽  
Visible Light Driven

K8Ce2I18O53 shows the highest visible light driven photocatalytic activity among rare earth iodates due to asynergistic effect between the narrow band gap and polar zero-dimensional [Ce(IO3)8]4− units.

BAND ALIGNMENT AND ATOM SEGREGATION OF LaYbO3 FILMS ON SILICON

2012 ◽  
Vol 19 (02) ◽  
pp. 1250013 ◽  
Author(s):  
WEI-TAO SU ◽  
DE-XUAN HUO ◽  
BIN LI
Keyword(s):  
Rare Earth ◽  
Band Gap ◽  
Silicon Substrate ◽  
Amorphous Film ◽  
Rare Earth Oxide ◽  
Dielectric Materials ◽  
Rare Earth Oxides ◽  
Band Alignment ◽  
Crystalline Film ◽  
High K

Ternary rare earth oxides are expected to be more promising high-k dielectric materials than conventional binary rare earth oxides due to higher band gap, higher permittivity and good interfacial stability. In the present study, the band alignment and atom thermal diffusion of LaYbO3 , a new ternary rare earth oxide, are studied by X-ray photoelectron spectrum (XPS) and angle-resolved XPS, respectively. The band gap value for LaYbO3 crystalline film rises to 6.7 eV compared with 6.2 eV for amorphous film. Valence (ΔEv) and conduction band (ΔEc) offset are ΔEv = 3.5 eV, ΔEc = 1.6 eV for the amorphous film and ΔEv = 3.3 eV, ΔEc = 2.3 eV for the crystalline film. From elemental depth profile through high-k layer and silicon substrate, it is shown that La atom tends to diffuse into silicon substrate and piles up at oxide/silicon interface at high annealing temperature ~1000°C.

Rare earth oxides in zirconium dioxide: How to turn a wide band gap metal oxide into a visible light active photocatalyst

2017 ◽  
Vol 26 (2) ◽  
pp. 270-276 ◽  
Author(s):  
Chiara Gionco ◽  
Maria C. Paganini ◽  
Elio Giamello ◽  
Olga Sacco ◽  
Vincenzo Vaiano ◽  
...  
Keyword(s):  
Rare Earth ◽  
Metal Oxide ◽  
Visible Light ◽  
Band Gap ◽  
Zirconium Dioxide ◽  
Wide Band ◽  
Rare Earth Oxides ◽  
Wide Band Gap ◽  
Visible Light Active

Yb5In2Sb6: A New Rare Earth Zintl Phase with a Narrow Band Gap

2000 ◽  
Vol 155 (1) ◽  
pp. 55-61 ◽  
Author(s):  
Sung-Jin Kim ◽  
John R. Ireland ◽  
Carl R. Kannewurf ◽  
Mercouri G. Kanatzidis
Keyword(s):  
Rare Earth ◽  
Band Gap ◽  
Narrow Band ◽  
Zintl Phase

Stable yellow ZnO mesocrystals with efficient visible-light photocatalytic activity

CrystEngComm ◽  
2014 ◽  
Vol 16 (34) ◽  
pp. 7906-7913 ◽  
Author(s):  
Yin Peng ◽  
Yu Wang ◽  
Qing-Guo Chen ◽  
Qing Zhu ◽  
An Wu Xu
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Band Gap ◽  
Oxygen Vacancies ◽  
Narrow Band ◽  
Visible Light Photocatalytic Activity ◽  
Visible Light Photocatalytic

In this work, we present a novel and facile approach to prepare yellow ZnO mesocrystals from Zn(OH)F precursor. The as-prepared yellow ZnO shows a narrow band-gap (Eg = 3.09 eV) and visible-light photocatalytic activity, which is due to the existence of abundant oxygen vacancies and vectorially aligned nanoparticles.

Sign in / Sign up

Export Citation Format

Share Document