CN1375695A - 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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- CN1375695A CN1375695A CN 01107642 CN01107642A CN1375695A CN 1375695 A CN1375695 A CN 1375695A CN 01107642 CN01107642 CN 01107642 CN 01107642 A CN01107642 A CN 01107642A CN 1375695 A CN1375695 A CN 1375695A
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Abstract
本发明是一种电场诱导顺电—铁电相变潜热测定仪。包括有功率补偿差示扫描量热计及电压控制器,其中功率补偿差示扫描量热计包括有冰柜、炉体、样品支持器、温差检测器、温度控制器、A/D转换器,电压控制器包括有高压电源、D/A转换器。本发明不仅可在－20℃到800℃的温度范围内,测量－2500V到+2500V多段可程序控制电压的作用下的电场诱导顺电—铁电相变潜热,对电场诱导顺电—铁电相变进行动力学的研究和应用研究,而且可在－20℃到800℃的温度范围内,对－2500V到+2500V多段可程序控制电压的作用下各种材料的热效应进行研究。
The invention is an electric field induced paraelectric-ferroelectric phase transition latent heat measuring instrument. Including a power compensation differential scanning calorimeter and a voltage controller, wherein the power compensation differential scanning calorimeter includes a freezer, a furnace body, a sample holder, a temperature difference detector, a temperature controller, an A/D converter, a voltage The controller includes a high-voltage power supply and a D/A converter. The invention can not only measure the latent heat of electric field-induced paraelectric-ferroelectric phase transition under the action of -2500V to +2500V multi-stage programmable control voltage in the temperature range of -20°C to 800°C, but also can measure the latent heat of electric field-induced paraelectric-ferroelectric phase transition Carry out dynamic research and application research, and can study the thermal effects of various materials under the action of multi-stage programmable control voltages from -2500V to +2500V within the temperature range of -20°C to 800°C.
Description
The present invention relates to a kind of surveying instrument, particularly a kind of electric field induced paraelectric-to-ferroelectric phase change latent heat measuring instrument.
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 there is not electric field induced paraelectric-to-ferroelectric phase change latent heat measuring instrument, 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 a kind of electric field induced paraelectric-to-ferroelectric phase change latent heat measuring instrument that can measure the latent heat of phase change that electric field induces para-electric-ferroelectric phase transition to produce.
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), sample (6) two surface relatively is provided with electrode, the electrode (12 at sample (6) two ends, 12 ') respectively by lead (15,16) ground end and the high-pressure side with high-voltage power supply (13) is connected, 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), sample (6) two surface relatively is provided with electrode, the electrode (12 at sample (6) two ends, 12 ') respectively by lead (15,16) ground end and the high-pressure side with high-voltage power supply (13) is connected, 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.
Said sample (6) is connected with the ground end of high-voltage power supply (13) near the electrode (12) of temperature sensor (5) one ends, and other end electrode (12 ') is connected with the high-pressure side of high-voltage power supply (13)
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 (7)
1, a kind of electric field induced paraelectric-to-ferroelectric phase change latent heat measuring instrument, 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), sample (6) two surface relatively is provided with electrode, the electrode (12 at sample (6) two ends, 12 ') respectively by lead (15,16) ground end and the high-pressure side with high-voltage power supply (13) is connected, 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 induced paraelectric-to-ferroelectric phase change latent heat measuring instrument according to claim 1 is characterized in that being provided with insulating heat-conductive sheet (11) between said sample (6) and the sample holder (3).
3, electric field induced paraelectric-to-ferroelectric phase change latent heat measuring instrument according to claim 1, it is characterized in that said sample (6) is connected with the ground end of high-voltage power supply (13) near the electrode (12) of temperature sensor (5) one ends, other end electrode (12 ') is connected with the high-pressure side of high-voltage power supply (13).
4, electric field according to claim 1 is induced para-electric one ferroelectric phase transition latent heat analyzer, but it is characterized in that above-mentioned voltage controller can produce multistage programmed control voltage.
5, electric field induced paraelectric-to-ferroelectric phase change latent heat measuring instrument according to claim 1 is characterized in that above-mentioned high-voltage power supply (13) is provided with automatic safety device.
6, according to claim 1 or 2 or 3 or 4 or 5 described electric field induced paraelectric-to-ferroelectric phase change latent heat measuring instruments, but it is characterized in that the multistage programmed control voltage that above-mentioned voltage controller produces can be-2500V is to+2500V.
7, according to claim 1 or 2 or 3 or 4 or 5 described electric field induced paraelectric-to-ferroelectric phase change latent heat measuring instruments, it is characterized in that the control temperature of said 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 |
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| CN1375695A true CN1375695A (en) | 2002-10-23 |
| CN1214242C CN1214242C (en) | 2005-08-10 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1849501B (en) * | 2003-07-10 | 2010-06-16 | 耐驰杰拉特鲍股份有限公司 | Low Thermal Inertia Adiabatic Scanning Calorimeter |
| CN102449465A (en) * | 2009-05-14 | 2012-05-09 | 地热能源公司 | 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 DSC Thermal Analysis Method Using Electric Field |
-
2001
- 2001-03-19 CN CN 01107642 patent/CN1214242C/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1849501B (en) * | 2003-07-10 | 2010-06-16 | 耐驰杰拉特鲍股份有限公司 | Low Thermal Inertia Adiabatic Scanning Calorimeter |
| CN102449465A (en) * | 2009-05-14 | 2012-05-09 | 地热能源公司 | 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 DSC Thermal Analysis Method Using Electric Field |
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| Publication number | Publication date |
|---|---|
| CN1214242C (en) | 2005-08-10 |
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