scholarly journals ABO4 type scheelite phases in (Ca/Sr)MoO4 - BiVO4 - Bi2Mo3O12 systems: synthesis, structure and optical properties

2021 ◽  
Vol 8 (2) ◽  
pp. 20218204
Author(s):  
Z. A. Mikhaylovskaya ◽  
E. S. Buyanova ◽  
S. A. Petrova ◽  
A. V. Klimova
Keyword(s):  
Optical Properties ◽  
Solid State ◽  
General Formula ◽  
Solid Solutions ◽  
Triple System ◽  
Complex Oxides ◽  
Vanadium Content ◽  
Energy Gaps ◽  
Munk Function ◽  
State Technique

The cation deficient complex oxides of (Ca/Sr)MoO4 - BiVO4 - Bi2Mo3O12 triple system are promising photocatalysts and pigments. Compounds with general formula of Ca1−1.5x-yBix+yФxMo1-yVyO4  and Sr1−1.5x-yBix+yФxMo1-yVyO4 were synthesized byconvention solid state technique in the range of 550–720 °C. Two wide regions of the solid solutions (ordinary and superstructured scheelite-type phases respectively) were found for each system. The diffuse scatering of homogeneous samples was investigated in the range of 190–1100 nm. Energy gaps calculated with linear approximation of Kubelka-Munk function decreases with bismuth and vanadium content.

scholarly journals ELECTROPHYSICAL PROPERTIES OF SOLID SOLUTIONS NANBFEO-(x = 0;0,1;0,2)

2020 ◽  
pp. 16-24
Author(s):  
Екатерина Владимировна Барабанова ◽  
Никита Михайлович Оспельников ◽  
Александра Ивановна Иванова
Keyword(s):  
Phase Transition ◽  
Electrical Conductivity ◽  
Electrical Properties ◽  
Curie Temperature ◽  
General Formula ◽  
Solid Solutions ◽  
Complex Oxides ◽  
Sodium Niobate ◽  
Electrophysical Properties ◽  
The Family

Введение легирующих примесей является классическим способом модификации свойств сложных оксидов семейства перовскита с общей формулой ABO. В качестве основы для создания твердых растворов широко используется ниобат натрия NaNbO. Введение замещающих катионов проводится как по позиции A, так и по позиции B. При этом особый интерес представляет случай, когда валентность легирующей примеси больше или меньше валентности исходного катиона в узле. В этом случае образуется дефектная структура, которая может обладать уникальными свойствами. Данная работа посвящена исследованию электрофизических свойств керамики ниобата натрия с примесью Fe. Замещение производилось по позициям катионов ниобия Nb . Показано, что для таких составов характерно значительное увеличение электропроводности, понижение температуры Кюри и размытие фазового перехода. Introduction of dopants is a classic method for modifying properties of perovskite complex oxides of the family of general formula ABO. Sodium niobate NaNbO is widely used as a basis for creating solid solutions. The introduction of substitutional cations is carried out at both position A and at position B . Of particular interest is the case when valence of the dopant is greater or less than valence of the initial cation at the site. In this case, a defected structure is formed, which may have unique properties. This work is devoted to study of the electrical properties of sodium niobate ceramics doped with Fe . The substitution was carried out according to positions of the nibium cations Nb . It is shown that such compositions are characterized by a significant increase in electrical conductivity, a decrease in the Curie temperature, and a diffuse of the phase transition.

Crystal chemistry of (RE, A)2M3O7 compounds (RE=Y, lanthanide; A=Ba, Sr, Ca; M=Al, Ga)

1999 ◽  
Vol 14 (3) ◽  
pp. 195-202 ◽  
Author(s):  
J. M. S. Skakle ◽  
R. Herd
Keyword(s):  
Optical Properties ◽  
Solid State ◽  
Neutron Diffraction ◽  
General Formula ◽  
Diffraction Data ◽  
Nonlinear Optical ◽  
Neutron Diffraction Data ◽  
Solid State Lasers ◽  
Size Mismatch ◽  
X Ray

Phases of general formula (RE, A)2M3O7 (RE=lanthanide, A=Ca, Sr, Ba; M=Ga, Al) are of interest for their nonlinear optical properties and have potential as solid state lasers. Their structures have been refined using X-ray and neutron diffraction data and are related to gehlenite, Ca2Al2SiO7, with M cations occupying Al and Si sites and RE and A cations sharing the Ca site with no evidence for ordering, although they occur in the ratio 1:1 because of stoichiometry; the M cations are tetrahedrally coordinated. (RE, Ba)2M3O7 compounds cannot be synthesized for M=Al or for RE cations smaller than Sm; this limitation is believed to be due to size mismatch between cations within the structure.

X-ray Structure Refinement and Vibrational Spectroscopy of Ca8Gd2 (PO4)6 O2

2013 ◽  
Vol 12 (10) ◽  
pp. 719-726
Author(s):  
R. Ayadi ◽  
Mohamed Boujelbene ◽  
T. Mhiri
Keyword(s):  
Solid State ◽  
General Formula ◽  
Vibrational Spectroscopy ◽  
Powder Diffraction ◽  
Infrared Spectra ◽  
Solid State Reaction ◽  
Structure Refinement ◽  
Unit Cell ◽  
Cell Group ◽  
X Ray

The present paper is interested in the study of compounds from the apatite family with the general formula Ca10 (PO4)6A2. It particularly brings to light the exploitation of the distinctive stereochemistries of two Ca positions in apatite. In fact, Gd-Bearing oxyapatiteCa8 Gd2 (PO4)6O2 has been synthesized by solid state reaction and characterized by X-ray powder diffraction. The site occupancies of substituents is0.3333 in Gd and 0.3333 for Ca in the Ca(1) position and 0. 5 for Gd in the Ca (2) position.  Besides, the observed frequencies in the Raman and infrared spectra were explained and discussed on the basis of unit-cell group analyses.

Quantum optics with nitrogen-vacancy centres in diamond

2017 ◽  
Author(s):  
Yiwen Chu ◽  
Mikhail D. Lukin
Keyword(s):  
Optical Properties ◽  
Quantum Information ◽  
Solid State ◽  
Quantum Optics ◽  
Quantum States ◽  
Nitrogen Vacancy ◽  
Common Theme ◽  
External Effects ◽  
Promising Candidate ◽  
Optical Photons

A common theme in the implementation of quantum technologies involves addressing the seemingly contradictory needs for controllability and isolation from external effects. Undesirable effects of the environment must be minimized, while at the same time techniques and tools must be developed that enable interaction with the system in a controllable and well-defined manner. This chapter addresses several aspects of this theme with regard to a particularly promising candidate for developing applications in both metrology and quantum information, namely the nitrogen-vacancy (NV) centre in diamond. The chapter describes how the quantum states of NV centres can be manipulated, probed, and efficiently coupled with optical photons. It also discusses ways of tackling the challenges of controlling the optical properties of these emitters inside a complex solid state environment.

scholarly journals First-principles study on structural, electronic and optical properties of perovskite solid solutions KB1−xMgxI3 (B = Ge, Sn) toward water splitting photocatalysis

RSC Advances ◽  
2021 ◽  
Vol 11 (42) ◽  
pp. 26432-26443
Author(s):  
Chol-Hyok Ri ◽  
Yun-Sim Kim ◽  
Un-Gi Jong ◽  
Yun-Hyok Kye ◽  
Se-Hun Ryang ◽  
...  
Keyword(s):  
Optical Properties ◽  
Water Splitting ◽  
Potassium Iodide ◽  
Solid Solutions ◽  
First Principles ◽  
Lead Free ◽  
First Principles Calculations ◽  
Electronic And Optical Properties ◽  
First Principles Study

We propose lead-free potassium iodide perovskite solid solutions KBI3 with B-site mixing between Ge/Sn and Mg as potential candidates for photocatalysts based on systematic first-principles calculations.

Advantages of naphthalene as building block for organic solid state laser dyes: Smaller energy gaps and enhanced stability

2021 ◽  
Author(s):  
Yuya Oyama ◽  
Masashi Mamada ◽  
Akihiro Kondo ◽  
Chihaya Adachi
Keyword(s):  
Solid State ◽  
Spontaneous Emission ◽  
Building Block ◽  
Solid State Laser ◽  
Laser Dyes ◽  
Energy Gaps ◽  
Organic Solid ◽  
Organic Laser ◽  
Yellow Region ◽  
Enhanced Stability

Organic laser dyes exhibiting very low amplified spontaneous emission (ASE) thresholds in green and yellow region were developed based on a stilbene structure which is often used for the blue...

Synthesis, structure and optical properties of europium doped calcium barium phosphate – a novel phosphor for solid-state lighting

2014 ◽  
Vol 2 (30) ◽  
pp. 6084 ◽  
Author(s):  
Naoyuki Komuro ◽  
Masayoshi Mikami ◽  
Yasuo Shimomura ◽  
Erica G. Bithell ◽  
Anthony K. Cheetham
Keyword(s):  
Optical Properties ◽  
Solid State ◽  
Solid State Lighting

Optical Properties of Novel 2,3-Dicyano-5-methyl-6H-1,4-diazepine Dyes in the Solid State

2005 ◽  
Vol 78 (6) ◽  
pp. 1167-1173 ◽  
Author(s):  
Emi Horiguchi ◽  
Shinya Matsumoto ◽  
Kazumasa Funabiki ◽  
Masaki Matsui
Keyword(s):  
Optical Properties ◽  
Solid State

Electron-irradiation-induced solid-state amorphization in supersaturated Ni–Zr solid solutions

2011 ◽  
Vol 19 (4) ◽  
pp. 511-517 ◽  
Author(s):  
Takeshi Nagase ◽  
Kazuya Takizawa ◽  
Yukichi Umakoshi
Keyword(s):  
Solid State ◽  
Solid Solutions ◽  
Electron Irradiation ◽  
State Amorphization

The Application of ß“-Alumina As A Solid State Laser Host

1985 ◽  
Vol 60 ◽  
Author(s):  
J. D. Barrie ◽  
D. L. Yang ◽  
B. Dunn ◽  
O. M. Stafsudd
Keyword(s):  
Optical Properties ◽  
Solid State ◽  
Ion Exchange ◽  
Exchange Process ◽  
Laser Action ◽  
Solid State Laser ◽  
Host Crystal ◽  
State Laser ◽  
Ion Exchange Process ◽  
Single Host

AbstractIon exchanged ß“-aluminas display a number of interesting optical properties which suggest that the material is well suited for application as a solid state laser host. Small platelets of Nd3+ Ion exchanged β“-alumina exhibit laser action with gain coefficients many times greater than YAG. The versatility of the ion exchange process enables one to form a wide variety of compounds with different active ions and concentrations, thereby allowing the study of many different effects within a single host crystal.

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