CN105887199A - Novel compound Ca2CrO4 crystal and preparation method thereof - Google Patents

Novel compound Ca2CrO4 crystal and preparation method thereof Download PDF

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Publication number
CN105887199A
CN105887199A CN201610249030.5A CN201610249030A CN105887199A CN 105887199 A CN105887199 A CN 105887199A CN 201610249030 A CN201610249030 A CN 201610249030A CN 105887199 A CN105887199 A CN 105887199A
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cro
crystal
preparation
cao
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靳常青
曹立朋
刘清青
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Institute of Physics of CAS
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    • C—CHEMISTRY; METALLURGY
    • C30—CRYSTAL GROWTH
    • C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
    • C30B29/00—Single crystals or homogeneous polycrystalline material with defined structure characterised by the material or by their shape
    • C30B29/10—Inorganic compounds or compositions
    • C30B29/16—Oxides
    • C30B29/22—Complex oxides
    • C—CHEMISTRY; METALLURGY
    • C30—CRYSTAL GROWTH
    • C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
    • C30B1/00—Single-crystal growth directly from the solid state
    • C30B1/10—Single-crystal growth directly from the solid state by solid state reactions or multi-phase diffusion

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
  • Analysing Materials By The Use Of Radiation (AREA)

Abstract

The present invention provides a kind of Ca2CrO4 crystal, and the Ca2CrO4 crystal is tetragonal structure, space group I41/acd, and lattice parameter is Above-mentioned Ca2CrO4 crystal is for improving A-Cr-O material system and being of great significance to its further system research. The present invention also provides the preparation method of above-mentioned Ca2CrO4 crystal and its applications in area of Spintronics.

Description

A kind of new compound Ca2CrO4Crystal and preparation method thereof
Technical field
The present invention relates to a kind of Ca2CrO4Crystal, particularly relates to a kind of new compound Ca2CrO4Crystal, and should Ca2CrO4The preparation method of crystal.
Background technology
Containing Cr4+Ion and CrO6The compound of octahedral coordination typically requires high-temperature and high-pressure conditions and could synthesize.Tool There is A-Cr-O (wherein A is alkali earth metal) the compound system of this kind of structure due to the difficulty in synthesis, to its research also The most insufficient, even there is also some controversial results.For different A bit elements, due to the difference of ionic radius, cause Crystal structure is distorted, and then causes different physical propertys.This is that regulation and control and the bandwidth of magnetic are regulated and controled by research structure Mott change an ideal material system.
In Sr-Cr-O system, simple perovskite SrCrO3, monolayer perovskite Sr2CrO4And part multi-layer phase Srn+ 1CrnO3n+1All there is the relevant report of synthesis.
And for Ca-Cr-O system, due to Ca2+Ionic radius is little, and structure can be distorted, and therefore synthesizes increasingly difficult, The only simple perovskite CaCrO synthesized at present3。
Summary of the invention
Therefore, blank based on above-mentioned existing research, it is an object of the invention to provide a kind of new compound Ca2CrO4 Crystal and preparation method thereof.
To achieve these goals, the invention provides a kind of new compound Ca2CrO4Crystal, wherein, described Ca2CrO4 Crystal is tetragonal structure, and space group is I41/ acd, lattice parameter is
The Ca provided according to the present invention2CrO4Crystal, wherein, described Ca2CrO4Crystal comprises in X-ray diffracting spectrum Below 2 θ angles of reflection measure characteristic peak: 14.56 °, 25.26 °, 32.84 °, 34.44 °, 37.56 °, 44.67 °, 45.86 °, 49.50 °, 51.87 °, 57.59 °, 60.68 °, 68.85 ° and 72.59 °.Preferably, the indices of crystallographic plane (hkl) of described characteristic peak point It is not 004,112,116,020,024,0012,028,220,224,0212,136,2212 and 040.It is highly preferred that described X-penetrates Ray diffraction diagram spectrum (XRD figure spectrum) is as shown in Figure 2.Described characteristic peak can within the scope of positive and negative 0.2 ° of features described above peak, i.e. 2 θ±0.2°。
The Ca provided according to the present invention2CrO4Crystal, wherein, described Ca2CrO4Crystal is half with spin glass magnetic Conductor.
Present invention also offers above-mentioned Ca2CrO4The preparation method of crystal, wherein, described preparation method include with CaO and CrO2For raw material, under high-temperature and high-pressure conditions, synthesize Ca by solid reaction process2CrO4The step of crystal.
The preparation method provided according to the present invention, wherein, described CaO and described CrO2Mol ratio be 2:1.
The preparation method provided according to the present invention, wherein, described high pressure is 1～10GPa, preferably 5～6GPa, most preferably For 5.5GPa, described high temperature is 800～1000 DEG C, and the described response time is 10～100min, preferably 20～40min, optimum Elect 30min as.
The preparation method provided according to the present invention, wherein, described solid reaction process includes: by the CaO that mix by proportioning with CrO2Mixture be pressed into slice of cylinder, with native gold wrap up, carry out solid state reaction.Preferably, described slice of cylinder diameter can be 6mm, thickness can be 2～3mm.
The preparation method provided according to the present invention, wherein, described CaO and described CrO2Glove box at full inert atmosphere In be sufficiently mixed uniformly.Preferably, described inert atmosphere can be Ar atmosphere.
The preparation method provided according to the present invention, wherein it is possible to carry out described in the high pressure assembling block of cubic hinge press Solid state reaction.Preferably, after solid state reaction, cooling release, strip off native gold, obtain described Ca2CrO4Crystal.
Specifically, the preparation method that the present invention provides may include that with CaO and CrO2For raw material, in full Ar atmosphere Glove box is sufficiently mixed uniformly, is pressed into slice of cylinder, wrap up with native gold, load high pressure and assemble in block, in pressure 5.5GPa, temperature React 30min under conditions of 800 DEG C～1000 DEG C, after cooling release, sample is taken out, strip off native gold, i.e. can get Ca2CrO4Brilliant Body.
Present invention also offers above-mentioned Ca2CrO4Crystal or according to above-mentioned preparation method prepared Ca2CrO4Crystal is certainly Application in rotation person in electronics.Preferably, described application in area of Spintronics can be Magnetic Random Access Memory, Application in spin traps ballistic transistor or spinning LED.
With CaO and CrO2For raw material, under conditions of High Temperature High Pressure, successfully synthesize Ca2CrO4Crystal.With Tetragonal K2NiF4The antiferromagnetic compound Sr of structure2CrO4Compare, Ca2CrO4Show as spin glass magnetic at low temperature, show due to Ca2CrO4In structural aberration, it is suppressed that the appearance of long-range magnetic order.Ca2CrO4Synthesis, for improving A-Cr-O material bodies System and significant to its further systematic study, can be used for area of Spintronics, such as Magnetic Random Access Memory, from Curl field ballistic transistor or spinning LED etc..
Accompanying drawing explanation
Hereinafter, describe embodiment of the present invention in detail in conjunction with accompanying drawing, wherein:
Fig. 1 shows the Ca of the present invention2CrO4The structural representation of crystal；
Fig. 2 shows the Ca of the present invention2CrO4The XRD figure spectrum of crystal and indexing thereof；
Fig. 3 shows the Ca of the present invention2CrO4Crystal susceptibility under 10kOe magnetic field and the relation curve of temperature；
Fig. 4 shows the Ca of the present invention2CrO4The resistivity of crystal and the relation curve of temperature.
Detailed description of the invention
The present invention is further illustrated below by specific embodiment, it should be understood, however, that, these embodiments are only It is used for specifically describing in more detail, and is not to be construed as limiting in any form the present invention.
This part to the present invention test used in material and test method carry out general description.Although it is Realize many materials that the object of the invention used and operational approach is to it is known in the art that but the present invention still uses up at this May describe in detail.It will be apparent to those skilled in the art that within a context, if not specified, material therefor of the present invention and behaviour It is well known in the art as method.
The reagent and the instrument that use in following example are as follows:
Reagent:
CaO, purchased from Alfa Aesar；CrO2, purchased from Sigma-Aldrich.
Instrument:
Sample synthesizes: cubic hinge press, purchased from domestic hinge type cubic hinge press；
XRD:X x ray diffractometer x, purchased from Rigaku；
Magnetic: vibrating specimen magnetometer (SQUID VSM), purchased from Quantum Design, model SQUID VSM；
Resistance: physical measurement system (PPMS), purchased from Quantum Design, model PPMS.
Embodiment 1
The present embodiment is for illustrating the Ca of the present invention2CrO4Crystal and preparation method thereof.
Use CaO and CrO2As raw material, with the mol ratio of 2:1, the two is sufficiently mixed in the glove box of full Ar gas Uniformly, it is pressed into diameter 6mm, the slice of cylinder of thick about 2-3mm, superscribes native gold, load high pressure and assemble in block, enter with cubic hinge press Row High Temperature High Pressure synthesizes.Pressure-maintaining and heat-preservation 30min under conditions of pressure 5.5GPa, temperature 800 DEG C, after cooling and release, takes out Sample, strip off native gold, i.e. can get Ca2CrO4Crystal.
By the X-ray diffractometer Ca to obtaining2CrO4Crystal carries out X-ray diffraction studies, this Ca2CrO4The XRD of crystal Collection of illustrative plates such as Fig. 2, the main peaks bit data of XRD figure spectrum is as shown in table 1, this Ca2CrO4Crystal is tetragonal structure, and space group is I41/ acd, lattice parameter is Its structural representation such as Fig. 1.
By the SQUID VSM Ca to obtaining2CrO4Crystal carries out magnetic susceptibility measurement, this Ca2CrO4Crystal susceptibility is with temperature Degree variation relation is as shown in Figure 3.
By the PPMS Ca to obtaining2CrO4Crystal carries out resistivity measurement, this Ca2CrO4Crystal resistivity becomes with temperature Change relation is as shown in Figure 4.
Table 1XRD collection of illustrative plates main peaks bit data
2θ 14.56 25.26 32.84 34.44 37.56 44.67 45.86 49.50 51.87 57.59 60.68 68.85 72.59
hkl 004 112 116 020 024 0012 028 220 224 0212 136 2212 040
Embodiment 2
The present embodiment is for illustrating the Ca of the present invention2CrO4Crystal and preparation method thereof.
Use CaO and CrO2As raw material, with the mol ratio of 2:1, the two is sufficiently mixed in the glove box of full Ar gas Uniformly, it is pressed into diameter 6mm, the slice of cylinder of thick about 2-3mm, superscribes native gold, load high pressure and assemble in block, enter with cubic hinge press Row High Temperature High Pressure synthesizes.Pressure-maintaining and heat-preservation 40min under conditions of pressure 5GPa, temperature 900 DEG C, after cooling and release, takes out sample Product, strip off native gold, i.e. can get Ca2CrO4Crystal.
By the X-ray diffractometer Ca to obtaining2CrO4Crystal carries out X-ray diffraction studies, this Ca2CrO4The XRD of crystal Collection of illustrative plates is identical with Fig. 2.
Embodiment 3
The present embodiment is for illustrating the Ca of the present invention2CrO4Crystal and preparation method thereof.
Use CaO and CrO2As raw material, with the mol ratio of 2:1, the two is sufficiently mixed in the glove box of full Ar gas Uniformly, it is pressed into diameter 6mm, the slice of cylinder of thick about 2-3mm, superscribes native gold, load high pressure and assemble in block, enter with cubic hinge press Row High Temperature High Pressure synthesizes.Pressure-maintaining and heat-preservation 20min under conditions of pressure 6GPa, temperature 1000 DEG C, after cooling and release, takes out sample Product, strip off native gold, i.e. can get Ca2CrO4Crystal.
By the X-ray diffractometer Ca to obtaining2CrO4Crystal carries out X-ray diffraction studies, this Ca2CrO4The XRD of crystal Collection of illustrative plates is identical with Fig. 2.
Embodiment 4
The present embodiment is for illustrating the Ca of the present invention2CrO4Crystal and preparation method thereof.
Use CaO and CrO2As raw material, with the mol ratio of 2:1, the two is sufficiently mixed in the glove box of full Ar gas Uniformly, it is pressed into diameter 6mm, the slice of cylinder of thick about 2-3mm, superscribes native gold, load high pressure and assemble in block, enter with cubic hinge press Row High Temperature High Pressure synthesizes.Pressure-maintaining and heat-preservation 100min under conditions of pressure 1GPa, temperature 800 DEG C, after cooling and release, takes out sample Product, strip off native gold, i.e. can get Ca2CrO4Crystal.
By the X-ray diffractometer Ca to obtaining2CrO4Crystal carries out X-ray diffraction studies, this Ca2CrO4The XRD of crystal Collection of illustrative plates is identical with Fig. 2.
Embodiment 5
The present embodiment is for illustrating the Ca of the present invention2CrO4Crystal and preparation method thereof.
Use CaO and CrO2As raw material, with the mol ratio of 2:1, the two is sufficiently mixed in the glove box of full Ar gas Uniformly, it is pressed into diameter 6mm, the slice of cylinder of thick about 2-3mm, superscribes native gold, load high pressure and assemble in block, enter with cubic hinge press Row High Temperature High Pressure synthesizes.Pressure-maintaining and heat-preservation 10min under conditions of pressure 10GPa, temperature 800 DEG C, after cooling and release, takes out sample Product, strip off native gold, i.e. can get Ca2CrO4Crystal.
By the X-ray diffractometer Ca to obtaining2CrO4Crystal carries out X-ray diffraction studies, this Ca2CrO4The XRD of crystal Collection of illustrative plates is identical with Fig. 2.
Although present invention has been a certain degree of description, it will be apparent that, without departing from the spirit and scope of the present invention Under the conditions of, the suitable change of each condition can be carried out.It is appreciated that and the invention is not restricted to described embodiment, and be attributed to right The scope required, it includes the equivalent of described each factor.

Claims (10)

1. a Ca2CrO4Crystal, it is characterised in that described Ca2CrO4Crystal is tetragonal structure, and space group is I41/ acd, Lattice parameter is
Ca the most according to claim 12CrO4Crystal, it is characterised in that described Ca2CrO4Crystal is in X-ray diffracting spectrum Comprise following 2 θ angles of reflection measure characteristic peak: 14.56 °, 25.26 °, 32.84 °, 34.44 °, 37.56 °, 44.67 °, 45.86 °, 49.50 °, 51.87 °, 57.59 °, 60.68 °, 68.85 ° and 72.59 °；Preferably, the indices of crystallographic plane of described characteristic peak It is respectively 004,112,116,020,024,0012,028,220,224,0212,136,2212 and 040；It is highly preferred that described X- X ray diffraction collection of illustrative plates is as shown in Figure 2.
Ca the most according to claim 1 or claim 22CrO4Crystal, it is characterised in that described Ca2CrO4Crystal is for having spin glass The quasiconductor of magnetic.
4. Ca according to any one of claim 1-32CrO4The preparation method of crystal, it is characterised in that described preparation method includes With CaO and CrO2For raw material, under high-temperature and high-pressure conditions, synthesize Ca by solid reaction process2CrO4The step of crystal.
Ca the most according to claim 42CrO4The preparation method of crystal, it is characterised in that described CaO and described CrO2Rub That ratio is 2:1.
6. according to Ca described in claim 4 or 52CrO4The preparation method of crystal, it is characterised in that described high pressure is 1～10GPa, Being preferably 5～6GPa, most preferably 5.5GPa, described high temperature is 800～1000 DEG C, and the described response time is 10～100min, It is preferably 20～40min, most preferably 30min.
7. according to Ca according to any one of claim 4 to 62CrO4The preparation method of crystal, it is characterised in that described solid phase is anti- Method is answered to include: CaO and CrO that will mix by proportioning2Mixture be pressed into slice of cylinder, with native gold wrap up, carry out solid state reaction；Excellent Selection of land, a diameter of 6mm of described slice of cylinder, thickness is 2～3mm.
Ca the most according to claim 72CrO4The preparation method of crystal, it is characterised in that described CaO and described CrO2Filling The glove box of full inert atmosphere is sufficiently mixed uniformly；Preferably, described inert atmosphere is Ar atmosphere.
9. according to Ca described in claim 7 or 82CrO4The preparation method of crystal, it is characterised in that at the high pressure of cubic hinge press Assemble in block and carry out described solid state reaction；Preferably, after solid state reaction, cooling release, strip off native gold, obtain described Ca2CrO4Crystal.
10. the Ca according to any one of claims 1 to 32CrO4Crystal or according to the side according to any one of claim 4 to 9 Method and the Ca for preparing2CrO4Crystal application in area of Spintronics；Preferably, described in area of Spintronics Application is the application in Magnetic Random Access Memory, spin traps ballistic transistor or spinning LED.
CN201610249030.5A 2016-04-20 2016-04-20 Novel compound Ca2CrO4 crystal and preparation method thereof Pending CN105887199A (en)

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CN108726877A (en) * 2018-06-15 2018-11-02 郑州轻工业学院 A kind of high temperature spin glass Ca3CoMnO6Preparation method
CN110904497A (en) * 2019-12-13 2020-03-24 澳门大学 Centimeter-level chromium oxide single crystal, preparation method thereof and storage device

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Publication number Priority date Publication date Assignee Title
CN108726877A (en) * 2018-06-15 2018-11-02 郑州轻工业学院 A kind of high temperature spin glass Ca3CoMnO6Preparation method
CN108726877B (en) * 2018-06-15 2020-12-04 郑州轻工业学院 High-temperature spinning glass Ca3CoMnO6Preparation method of (1)
CN110904497A (en) * 2019-12-13 2020-03-24 澳门大学 Centimeter-level chromium oxide single crystal, preparation method thereof and storage device
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