CN1214242C - Electric field induced paraelectric-to-ferroelectric phase change latent heat measuring instrument - Google Patents
Electric field induced paraelectric-to-ferroelectric phase change latent heat measuring instrument Download PDFInfo
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- CN1214242C CN1214242C CN 01107642 CN01107642A CN1214242C CN 1214242 C CN1214242 C CN 1214242C CN 01107642 CN01107642 CN 01107642 CN 01107642 A CN01107642 A CN 01107642A CN 1214242 C CN1214242 C CN 1214242C
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- 230000005684 electric field Effects 0.000 title claims abstract description 33
- 230000007704 transition Effects 0.000 claims description 28
- 239000013558 reference substance Substances 0.000 claims description 6
- 230000000694 effects Effects 0.000 abstract description 4
- 239000000463 material Substances 0.000 abstract description 2
- 238000005057 refrigeration Methods 0.000 description 8
- 239000007787 solid Substances 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004590 computer program Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
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Abstract
The present invention relates to an electric-field induced parelectric-ferroelectric phase-change latent-heat measuring meter which comprises a power compensation differential scanning heat measuring meter and a voltage controller, wherein the power compensation differential scanning heat measuring meter comprises a refrigerator, a furnace body, a sample supporter, a temperature difference detector, a temperature controller and an A/D converter, and the voltage controller comprises a high-voltage power supply and a D/A converter. The present invention can measure electric-field induced parelectric-ferroelectric phase-change latent heat under the action of the multi-section program-controlled voltage of-2500 V to +2500 V in the temperature range of-20 DEG C to 800 DEG C, and the present invention carries out the dynamic research and the application research of electric-field induced parelectric-ferroelectric phase change. The present invention can also carry out the research of the heat effect of various materials under the action of the multi-section program-controlled voltage of-2500 V to +2500 V in the temperature range of-20 DEG C to 800 DEG C.
Description
The present invention relates to a kind of surveying instrument, particularly a kind of electric field is induced para-electric-ferroelectric phase transition latent heat analyzer.
Existing refrigerating method can be divided into and utilizes solid working medium to freeze and gas phase refrigeration, solid working medium refrigeration is owing to have advantage free from environmental pollution and that have higher conversion efficiency etc. to give prominence to and be widely used, solid working medium refrigeration can be divided into semiconductor refrigerating according to the mode of refrigeration, electric field-induced phase transition refrigeration and magnetic refrigeration, wherein the electric field-induced phase transition refrigeration is near Curie point, under the inducing of electric field, make ferroelectrics be transformed into ferroelectric phase (heat release) by paraelectric phase, become paraelectric phase (heat absorption) by ferroelectric phase when withdrawing from the arena, utilize electric field to induce the release of the latent heat of phase change of para-electric-ferroelectric phase transition generation to freeze with absorption.Because the latent heat of phase change that electric field induces para-electric-ferroelectric phase transition to produce is bigger, so it has a good application prospect.But at present electric field is induced the research of para-electric-ferroelectric phase transition owing to also do not have electric field to induce para-electric-ferroelectric phase transition latent heat analyzer, still can only study the temperature difference that electric field induces para-electric-ferroelectric phase transition to produce, can not induce para-electric-ferroelectric phase transition latent heat to measure to electric field, influence the research that electric field induces para-electric-ferroelectric phase transition to be applied to freeze.
The object of the present invention is to provide and a kind ofly can induce para-electric-ferroelectric phase transition latent heat analyzer the electric field that the latent heat of phase change that electric field induce para-electric-ferroelectric phase transition to produce is measured.
Structure principle chart of the present invention as shown in drawings, include power back-off differential scanning calorimeter and voltage controller, wherein the power back-off differential scanning calorimeter includes refrigerator-freezer (1), body of heater (2), sample holder (3,3 '), temperature detector (8), temperature controller (9), A/D converter (10), voltage controller includes high-voltage power supply (13), D/A converter (14), wherein body of heater (2) places in the refrigerator-freezer (1), sample holder (3,3 ') place in the body of heater (2), and sample holder (3,3 ') the bottom be respectively equipped with temperature sensor (5,5 ') and electric resistance heater (4,4 '), put respectively the upper end sample (6), reference substance (7), wherein the electrode (12) that is provided with of sample (6) lower surface is connected with the ground end of high-voltage power supply (13) by lead (15), the electrode (12 ') that sample (6) upper surface is provided with is connected with high-pressure side by lead (16), the input end of temperature detector (8) and temperature sensor (5,5 ') connect, output terminal is connected with the input end of temperature controller (9), the output terminal of temperature controller (9) and electric resistance heater (4,4 ') connect, another output terminal is connected with the input end of A/D converter (10), the output terminal of A/D converter (10) is connected with computing machine by computer interface, the control input end of high-voltage power supply (13) is connected with the output terminal of D/A converter (14), and the input end of D/A converter (14) is connected with computing machine by computer interface.
Describe concrete condition of the present invention in detail below in conjunction with accompanying drawing:
Fig. 1 is a structure principle chart of the present invention;
Fig. 2 is the installation enlarged drawing of sample among Fig. 1 (6);
Fig. 3 measures (Ba for the present invention
1-xSr
x) TiO
3The pottery electric field is induced the latent heat curve map (condition: 25.0 ℃, voltage was added to 2400V in 1.0 seconds, kept 60.0 seconds, withdrew from the arena in 1.0 seconds) of para-electric-ferroelectric phase transition;
Fig. 4 measures (Ba for the present invention
1-xSr
x) TiO
3The pottery electric field is induced the latent heat curve map (condition: 25.0 ℃, voltage was added to 2400V in 100.0 seconds, kept 60.0 seconds, withdrew from the arena in 1.0 seconds) of para-electric-ferroelectric phase transition.
Structure principle chart of the present invention such as Fig. 1, shown in Figure 2, include power back-off differential scanning calorimeter and voltage controller, wherein the power back-off differential scanning calorimeter includes refrigerator-freezer (1), body of heater (2), sample holder (3,3 '), temperature detector (8), temperature controller (9), A/D converter (10), voltage controller includes high-voltage power supply (13), D/A converter (14), wherein body of heater (2) places in the refrigerator-freezer (1), sample holder (3,3 ') place in the body of heater (2), and sample holder (3,3 ') the bottom be respectively equipped with temperature sensor (5,5 ') and electric resistance heater (4,4 '), put respectively the upper end sample (6), reference substance (7), wherein the electrode (12) that is provided with of sample (6) lower surface is connected with the ground end of high-voltage power supply (13) by lead (15), the electrode (12 ') that sample (6) upper surface is provided with is connected with high-pressure side by lead (16), the input end of temperature detector (8) and temperature sensor (5,5 ') connect, output terminal is connected with the input end of temperature controller (9), the output terminal of temperature controller (9) and electric resistance heater (4,4 ') connect, another output terminal is connected with the input end of A/D converter (10), the output terminal of A/D converter (10) is connected with computing machine by computer interface, the control input end of high-voltage power supply (13) is connected with the output terminal of D/A converter (14), and the input end of D/A converter (14) is connected with computing machine by computer interface.
The electrode (12) of described sample (6) one ends is arranged on the side of temperature sensor (5).
For preventing that high-voltage power supply to the interference that the power back-off differential scanning calorimeter produces electric signal, is provided with insulating heat-conductive sheet (11) between said sample (6) and the sample holder (3).Sample (6) is placed on the sample holder (3) after isolating with insulating heat-conductive sheet (11)
For making usable range of the present invention bigger, but above-mentioned voltage controller can produce multistage programmed control voltage.But the multistage programmed control voltage that voltage controller produces can be-and 2500V is to+2500V.The control temperature of said temperature controller (9) can be-20 ℃ to 800 ℃.In addition, be the reliability that guarantees that the present invention uses, above-mentioned high-voltage power supply (13) is provided with automatic safety device.
The present invention measures (Ba
1-xSr
x) TiO
3The latent heat curve that the pottery electric field is induced para-electric-ferroelectric phase transition as shown in Figure 3, it is under 25.0 ℃ of temperature, voltage is added to 2400V in 1.0 seconds, keeps the latent heat situation of withdrawing from the arena in 1.0 seconds 60.0 seconds.
The present invention measures (Ba
1-xSr
x) TiO
3The latent heat curve map that the pottery electric field is induced para-electric-ferroelectric phase transition as shown in Figure 4, it is under 25.0 ℃ of temperature, voltage is added to 2400V in 100.0 seconds, keeps the latent heat situation of withdrawing from the arena in 1.0 seconds 60.0 seconds.
When the present invention uses, output by computer program control D/A converter (14), control high-voltage power supply (13) by the output of D/A converter (14) again but output multistage programmed control voltage, temperature sensor (5,5 ') temperature of test samples (6) and reference substance (7) respectively, temperature detector (8) detects their temperature difference, simultaneously, temperature controller (9) is controlled the electric resistance heater (4 of sample (6) and reference substance (7) respectively, 4 '), when sample (6) heat release, provide power back-off to reference substance (7), when absorbing heat, sample (6) provides power back-off to sample (6), make temperature difference be lower than 0.01 ℃, the power of compensation is received computing machine by A/D converter (10) and computer interface, time integral is obtained the variation of heat.
The present invention is owing to can measure the latent heat of phase change that electric field induces para-electric-ferroelectric phase transition to produce, therefore, it can accelerate the research that electric field induces para-electric-ferroelectric phase transition to be applied to freeze, and induces para-electric-applying of ferroelectric phase transition refrigeration for electric field effective scientific basis is provided.
The present invention not only can be in-20 ℃ to 800 ℃ temperature range, but measurement-2500V induces para-electric-ferroelectric phase transition latent heat to the electric field under the effect of+2500V multistage programmed control voltage, induce para-electric-ferroelectric phase transition to carry out dynamic (dynamical) research and applied research to electric field, and can be in-20 ℃ to 800 ℃ temperature range, but right-2500V thermal effect of various materials under the effect of+2500V multistage programmed control voltage be studied.
Claims (6)
1, a kind of electric field is induced para-electric one ferroelectric phase transition latent heat analyzer, it is characterized in that including power back-off differential scanning calorimeter and voltage controller, wherein the power back-off differential scanning calorimeter includes refrigerator-freezer (1), body of heater (2), sample holder (3,3 '), temperature detector (8), temperature controller (9), A/D converter (10), voltage controller includes high-voltage power supply (13), D/A converter (14), wherein body of heater (2) places in the refrigerator-freezer (1), sample holder (3,3 ') place in the body of heater (2), and sample holder (3,3 ') the bottom be respectively equipped with temperature sensor (5,5 ') and electric resistance heater (4,4 '), put respectively the upper end sample (6), reference substance (7), wherein the electrode (12) that is provided with of sample (6) lower surface is connected with the ground end of high-voltage power supply (13) by lead (15), the electrode (12 ') that sample (6) upper surface is provided with is connected with high-pressure side by lead (16), the input end of temperature detector (8) and temperature sensor (5,5 ') connect, output terminal is connected with the input end of temperature controller (9), the output terminal of temperature controller (9) and electric resistance heater (4,4 ') connect, another output terminal is connected with the input end of A/D converter (10), the output terminal of A/D converter (10) is connected with computing machine by computer interface, the control input end of high-voltage power supply (13) is connected with the output terminal of D/A converter (14), and the input end of D/A converter (14) is connected with computing machine by computer interface.
2, electric field according to claim 1 is induced para-electric one ferroelectric phase transition latent heat analyzer, it is characterized in that being provided with insulating heat-conductive sheet (11) between described sample (6) and its sample holder (3).
3, electric field according to claim 1 is induced para-electric one ferroelectric phase transition latent heat analyzer, but it is characterized in that described voltage controller produces multistage programmed control voltage.
4, electric field according to claim 1 is induced para-electric one ferroelectric phase transition latent heat analyzer, it is characterized in that described high-voltage power supply (13) is provided with automatic safety device.
5, electric field according to claim 3 is induced para-electric one ferroelectric phase transition latent heat analyzer, but it is characterized in that multistage programmed control voltage that described voltage controller produces for-2500V to+2500V.
6, induce para-electric one ferroelectric phase transition latent heat analyzer according to the described electric field of arbitrary claim in the claim 1 to 4, it is characterized in that the control temperature of described temperature controller (9) is-20 ℃ to 800 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01107642 CN1214242C (en) | 2001-03-19 | 2001-03-19 | Electric field induced paraelectric-to-ferroelectric phase change latent heat measuring instrument |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01107642 CN1214242C (en) | 2001-03-19 | 2001-03-19 | Electric field induced paraelectric-to-ferroelectric phase change latent heat measuring instrument |
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| Publication Number | Publication Date |
|---|---|
| CN1375695A CN1375695A (en) | 2002-10-23 |
| CN1214242C true CN1214242C (en) | 2005-08-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 01107642 Expired - Fee Related CN1214242C (en) | 2001-03-19 | 2001-03-19 | Electric field induced paraelectric-to-ferroelectric phase change latent heat measuring instrument |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005008203A2 (en) * | 2003-07-10 | 2005-01-27 | Tiax Llc | Low thermal inertia scanning adiabatic calorimeter inventor |
| US8035274B2 (en) * | 2009-05-14 | 2011-10-11 | The Neothermal Energy Company | Apparatus and method for ferroelectric conversion of heat to electrical energy |
| CN110530925A (en) * | 2019-08-08 | 2019-12-03 | 西安交通大学 | A kind of DSC heat analysis method applying electric field action |
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2001
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