Synthesis and characterization of M–Cl (M=Fe, Co, Ni) boracites

Li, D; Xu, Zhi; Wang, Z.H; Geng, D. Y.; Zhang, J.S; Zhang, Z.D; Yuan, Guoxia; Liu, J.-M

doi:10.1016/s0925-8388(02)01040-x

Cited by 9 publications

(3 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The BSCT powders were prepared by chemical co-precipitation method of which the whole process had been reported in some other literatures [17,18]. The two-step sol-gel procedure for preparing the BSCT-MgO composite powders was listed in Fig.…”

Section: Preparation Of the Bsct-mgo Composite Powders And The Bsct-mmentioning

confidence: 99%

Two-step sol–gel method for preparing MgO–MnO2–B2O3–Li2O co-added core-shell structural Ba0.55Sr0.40Ca0.05TiO3 powders and the dielectric properties of the composite ceramics

Liu

et al. 2011

J Mater Sci: Mater Electron

View full text Add to dashboard Cite

The Ba 0.55 Sr 0.4 Ca 0.05 TiO 3 -MgO (BSCT-MgO) composite powders possessing core-shell structure, small particle size and high specific surface area were prepared by the novel two-step sol-gel method which was based on the citric acid (CA)-ethylene glycol (EG) system. In this experiment, the Ba 0.55 Sr 0.40 Ca 0.05 TiO 3 (BSCT) powders were firstly synthesized by chemical co-precipitation method. MgO [(MgO/BSCT) mass = 1] and MnO 2 [(MnO 2 / BSCT) mole = 0.01] were added into the BSCT powders in the first sol-gel step. 1.5 wt% B 2 O 3 -Li 2 O as sintering aids was added into the composite powders during the second sol-gel step. The BSCT-MgO composite powders were detected to have a perfect core-shell structure which was detected by the transmission electron microscope. Perovskite BSCT and periclase MgO were confirmed to exist in the BSCT-MgO composite powders according to the X-ray diffraction patterns. The Ba 0.55 Sr 0.4 Ca 0.05 TiO 3 -MgO (BSCT-MgO) composite ceramics that synthesized with the core-shell powders were sintered at 1,000°C for 2 h. According to the scanning electron microscope images, the grain sizes of BSCT and MgO in the BSCT-MgO composite ceramics were in the range of 0.5-2.0 lm and 1.0-2.5 lm, respectively. The dielectric constant of the BSCT-MgO composite ceramics was 210 and the dielectric loss was 0.0012 when tested at 1 MHz, room temperature. The BSCT-MgO composite ceramics were expected to be a promising candidate for applying as phase shifters or tunable components, etc, in the microwave field.

show abstract

Section: Preparation Of the Bsct-mgo Composite Powders And The Bsct-mmentioning

confidence: 99%

Two-step sol–gel method for preparing MgO–MnO2–B2O3–Li2O co-added core-shell structural Ba0.55Sr0.40Ca0.05TiO3 powders and the dielectric properties of the composite ceramics

Liu

et al. 2011

J Mater Sci: Mater Electron

View full text Add to dashboard Cite

show abstract

“…17 In some situations, X can be S, Se, or Te and M may be single valence Li. 18 In nature there are four types of boracite. These are ericaite and trembathite, with the same formulae of (Fe,Mg) Usually boracites were synthesized through four different methods, namely hydrothermal, pressurized mechanical, vapor transfer, and sintering flow.…”

Section: Introductionmentioning

confidence: 99%

Synthesis, characterization, and electrical and optical properties of magnesium-type boracite

İBROŞKA¹,

Kıpçak²,

Yuksel³

et al. 2015

Turk J Chem

View full text Add to dashboard Cite

Synthesis of the magnesium type of the mineral boracite (Mg 3 B 7 O 13 Cl) was studied. Several parameters affecting boracite synthesis were investigated. The raw materials selected were magnesium chloride hexahydrate (MgCl 2 .6H 2 O), magnesium oxide (MgO), and boron oxide (B 2 O 3) . Reaction temperatures were selected between 600 • C and 900 • C. Moreover, three different reaction times of 4, 1, and 0.5 h were studied with the determined optimum molar ratio, reaction temperature, and reaction medium. Synthesized boracite characterization analyses were done by the techniques of X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), and scanning electron microscope (SEM). Reaction yields were also calculated. From the results of this study the magnesium type of boracite was obtained as a single phase with high XRD crystal score. Optimum conditions for the synthesis were as follows:

show abstract

“…Due to these concerns, there has been a growing focus on materials derived from boracite. Compounds such as Pb 2 B 5 O 9 I, 23 K 3 B 6 O 10 X (X = Cl, Br), 24 and M 3 B 7 O 13 X (M = Mn, Mg, Zn, Co, Cu; X = Cl, Br) 25–29 have been successively studied and are believed to hold high potential in areas such as deep-UV NLO and ferroelectric/piezoelectric/pyroelectric functionalities. Unfortunately, the understanding of the critical characteristics, particularly the spontaneous polarization mechanism of these materials, remains unclear.…”

mentioning

confidence: 99%

Crystal growth and spontaneous polarization mechanism of polar metal borate halides: Mn₃B₇O₁₃Cl

Li,

Zhang,

Guo

et al. 2024

CrystEngComm

View full text Add to dashboard Cite

show abstract

Synthesis and characterization of M–Cl (M=Fe, Co, Ni) boracites

Cited by 9 publications

References 21 publications

Two-step sol–gel method for preparing MgO–MnO2–B2O3–Li2O co-added core-shell structural Ba0.55Sr0.40Ca0.05TiO3 powders and the dielectric properties of the composite ceramics

Two-step sol–gel method for preparing MgO–MnO2–B2O3–Li2O co-added core-shell structural Ba0.55Sr0.40Ca0.05TiO3 powders and the dielectric properties of the composite ceramics

Synthesis, characterization, and electrical and optical properties of magnesium-type boracite

Crystal growth and spontaneous polarization mechanism of polar metal borate halides: Mn₃B₇O₁₃Cl

Contact Info

Product

Resources

About

Synthesis and characterization of M–Cl (M=Fe, Co, Ni) boracites

Cited by 9 publications

References 21 publications

Two-step sol–gel method for preparing MgO–MnO2–B2O3–Li2O co-added core-shell structural Ba0.55Sr0.40Ca0.05TiO3 powders and the dielectric properties of the composite ceramics

Two-step sol–gel method for preparing MgO–MnO2–B2O3–Li2O co-added core-shell structural Ba0.55Sr0.40Ca0.05TiO3 powders and the dielectric properties of the composite ceramics

Synthesis, characterization, and electrical and optical properties of magnesium-type boracite

Crystal growth and spontaneous polarization mechanism of polar metal borate halides: Mn3B7O13Cl

Contact Info

Product

Resources

About

Crystal growth and spontaneous polarization mechanism of polar metal borate halides: Mn₃B₇O₁₃Cl